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Andy Born Jim Emerso n

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1. 30 4 14 1 Open Loop Tracking Lettre E E e repe 30 4 14 2 Closed Loop Tracking vois a a HO 30 4 14 3 Non Sidereal Tracking 5e HR etri 30 45 EXPOSURE REQUIREMENTS iioii ito UH HER ERROT 30 4 15 1 Exposure Lengthi uoi e R 30 4 15 2 Exposure e eO t RO R A A 30 4 15 3 Wl MM ET 30 4 15 4 Exposure Rate Readout eese eene tnnt nennen rennen netter nene 31 210 DATA HANDLING sisihe ROB IRURE IRR ERG REUS 3l 4 16 1 Stored E 3l 4 16 2 WHITING TO DISK qc ME 32 4 16 3 ESRB Deus o ob 32 4 16 4 EI POE 32 4 16 5 D t Storage e en eo 32 4 16 6 Near Line Stra Be m 32 4 16 7 Quality Control eie iet 32 4 16 8 Local Data Reduction et eite Er etre Dy Bee per xe Bet ete E 32 TIL CDHERMAT CONTROL otto petes E dn EIE 33 VISTA SUBSYSTEM CHARACTERISTICS AND 2 22 11 34 5 1 TELESCOPE REQUIREMENTS itr enden ee ET ERE HERR GTP ORO TERRE 34 344 General Characteristicsa iiit eie E oe aide
2. EMEN A ES RO 74 5 8 6 Vacuum Pumping Equipment esee porediti eene anreisen eiee 74 38 7 Power Requirements a eet e E de I REEN E E E 73 hA MEC 7 E E E E E E AE 75 DBD Process GOS oi 75 5 8 10 75 5 8 11 Coating Plant cc seseccessineonvtssnsedersscosjreisesntenisasnseraeascdessenetinoisnsednoioasedendsesedecdsemsiond ves 75 5 9 SERVICE AND HANDLING EQUIPMENT ccsceseesssseeecececeesseaeceeececeeeuaeeecececeeseaaseeeeeeesensaaeseteceesesennaaees 75 hu EE 75 hU MEMPEiDEUITITI 75 5 9 3 Basic Handling Equipment 76 5 9 4 Special Handling Equipment eese eene tnnt eene nennen tren enne 76 5 10 TEST EQUIPMENT sererai 76 5 10 1 WAVES Ta 76 9 Doc Number VIS SPE ATC 00000 0008 Date 9 February 2006 Issue 1 0 Page 6 of 97 Author Andrew Born DOD Bins testes Sones tet suc loess 76 cutee ave cut 76 OPERATIONAL REQUIREMENT scsssccsscsssssssscssssssccsscsssssessnecsssssssesessossssnasosseessssesscssssecossessssossossesesessees 77 6 1 1 Control of
3. Band J H Ks mag s sq 16 0 14 1 13 0 arcsec 2 deleted as duplicated 4 12 2 Throughput The System Throughput includes the effects of optics filters and detectors but not those of the atmosphere or degradation from dust or reflectivity decay of mirrors The System Throughput assumes M1 and M2 with clean untarnished silver coating 1 Under these assumptions the System Throughput at each band using mirrors coated with protected silver shall be equal or greater than those defined in Table 3 2 Detector pixels defined as bad in Section 5 3 6 1 shall not be subject to this requirement Band J H Ks System Throughput 0 22 0 33 0 36 Table 3 VISTA Throughput Requirements 4 12 3 Scattered Light The following definitions are used in specifying the scattered light requirements Natural Sky Light detected at the focal plane from the directly observed science field including moonlight scattered in the atmosphere Scattered light Light detected at the focal plane in addition to that of the natural sky including moonlight scattered from other sources Doc Number VIS SPE ATC 00000 0008 Date 9 February 2006 Issue 1 0 Page 28 of 97 Pr ject mr DfA fice Author Andrew Born 1 Light scattered from a Ist magnitude object 1 5 from the centre of the field shall not contribute gt 50 additional light over and above the dark night sky bac
4. 63 FAD General Safety Requirements oe e e o PEN EBENE E due reae enema eee 83 FAS MECHANICAL SOLELY E 83 744 Protection against electric shock and other hazards eene 83 nse 84 7 46 Hydraulic Safely ei T Et e Pei Peto eH 64 TAL Pneumatic Safety tiir HE 64 74 8 Cooling System Safety eit ie o Rete ERI 64 7 49 Software Safety 84 7 4 10 Handling Transport and Storage 1 85 7 4 11 Ope ALONG Safety sifir urosis 85 7 4 12 Safety Interlock System 85 GENERAL REQUIREMENTS FOR DESIGN AND CONSTRUCTION 86 8 1 REQUIREMENTS FOR ANALYSEBS ta EID PEE 86 8 1 1 Finite Element Structural Analyses eese eere nee nennen eene netten nnne 86 6 1 2 Requirement for Safety Analyses 88 8 1 3 Control loop design and analysis 68 8 1 4 Electromagnetic Compatibility analysis eese eee entente eterne 68 8 2 MATERIAL PARTS AND PROCESSES i102 s0sccssdee3savss
5. 244 ete 77 6 1 2 Independent Operation of 77 6 1 3 Engineering Calibration Procedures eese eene entente nenne nennen 77 6 4 Obsering MOOS ics ie tO HS MEE 77 6 1 5 Observing and Engineering 77 646 tete eri tee e bees 78 6 1 7 Weather Monitoring sisig sedea dE dp reg ee teste t tee 78 O18 Readout Noise Pickup eee Het e tede nes feet deo Heg ate petet des 78 RELIABILITY MAINTAINABILITY amp SAFETY REQUIREMENTS 79 7 1 TEEESCOPE LIEETIMEB 45er eene 79 7 2 SYSTEM RELIABILITY hec tete reete eee ee 79 7 2 I Overall Availability ied alles c ER ene 79 7 2 2 Specific Reliability Requirements 79 7 3 MAINTAINABILITY GUIDELINES AND eese nene eere 79 7 3 1 Guidelines for Diagnosis and Maintenance by Software eese entren 79 74 3 2 Maintenance Approach eese hee ette be e vota vas ovens ceed nen iE se onus 80 7 3 3 Monitoring amp Test routines essent teen nent nnne 61 FSA SPAVES mm 81 7 3 5 Specific Maintainability 82 74 ijs 83 7 41 Hazard Risk Acceptance
6. Coma neutral point BN d Tilt Interface between M2 Assembly amp M2 Unit M2 Vertex Figure 2 M2 Unit Effective Axes 6 These effective motions shall be controllable via the electrical interface to the TCS 7 The M2 Unit shall not require fast tip tilt control VIS SPE ATC 00000 0008 Doc Number i Date 9 February 2006 Issue 1 0 gt Page 47 of 97 re ject Author Andrew Born 8 The resolution accuracy and stability of M2 Unit motion shall be consistent with achieving the overall SIQ performance as per section 4 9 1 2 5 1 14 2 Functional Description no text 5 1 14 3 Interface Requirements The M2 unit shall meet the interface requirements of AD36 5 1 14 4 Co ordinate Systems no text 5 1 14 5 M2 Unit Physical Characteristics no text 5 1 14 6 Requirements on M2 Mirror Positioning no text 5 1 14 7 M2 Mirror Position Stability no text 5 1 14 8 M2 Baffle Requirements 1 Areflective annular baffle shall be placed around the M2 to block out the sky background seen by the IR camera between the outer edge of the M2 and the edge of the cryostat window 2 The M2 Baffle shall present a spherical reflective surface or surfaces to the camera the radii of curvature chosen such that any point on the IR focal plane sees a cold surface inside the cryostat reflected in the baffle 5 1 15 M2 Control 5 1 15 1 TCS Interface The M2 Control
7. 34 5 1 2 Telescope Design Volume sisisi naonana 34 5 1 3 Telescope related Masses eite ette enini ostii inde 34 5 1 4 Telescope Dynamic Performance eene then eren eren ren eterne tenente 34 3 1 5 Telescope Optics Requirements eire tette petente eee 34 234 0 MLIBlank Characteristics E tae eee 34 5 1 7 MI Mirror Optical Characteristics ren ren rennen 35 5 1 8 Secondary Mirror Assembly e ede pee eg ie pios dese 36 3 L9 Telescope Structure iio epe ee reete Qe Bree ele Poe nene ip EE ERE eL EE FEE 37 5 1 10 AIAZ DM 39 5 1 11 Primary Mirror Cell eet torte tees pice 43 5 1 12 MI Cell Thermal requirements i e 45 5 1 13 eicere E EA 45 5 1 14 M2 UNU AIC m 46 5 1 15 A PAG BP 47 5 1 16 Cassegrai Rotator uiii eset tt iene ss e te soe ede FUR Hore tee pet bates E EERE 48 5 1 17 Cassegrain Rotator Control eese seen terne nennen 49 5 1 18 Guiding and Wavefront Sensing Requirements eese eene trennen eene 50 5 2 VISIBLE CAMERA E CREER 51 5 3 IR CAMERA c M M 51
8. 5 3 3 Filter Mechanism Assembly 5 3 3 1 Filter Sets 1 The filter mechanism shall accommodate up to eight filter holders seven science one opaque at any time 5 3 3 2 Access for Manual Filter Replacement The filter holders shall be accessible via a port on the filter wheel housing in order to allow filters holders to be changed without major disassembly of the camera 5 3 3 3 Filter Deployment 1 It shall be possible to move to adjacent filters within 25s 2 It shall be possible to move to any other filter within 60s 3 It shall be possible to position the filters in the optical path to better than 100um horizontally and 500um vertically 5 3 4 Camera Structure Assembly no text 5 3 5 Flexure no text Doc Number Date 9 February 2006 Issue 1 0 Page 53 of 97 VIS SPE ATC 00000 0008 Pr ject tice Author Andrew Born 5 3 6 Focal Plane Unit Assembly 1 The focal plane module shall be used to hold thermally condition and protect the IR detector arrays and their associated circuit boards electronics and cables There shall be supplied sixteen detectors on a 4x4 array with spacing 90 in the Camera x direction by 42 5 in the y direction these percentages being relative to the detector active widths Over voltage and electro static discharge protection circuitry shall be provided to protect the detectors Detector and controller non linearity shall be lt 3 befor
9. No explicit photometric requirements are defined in the Technical Specification but technical parameters are specified to ensure that the photometric requirements in the SRD ADO1 be achieved These requirements are listed in Table 2 VISTA Doc Number VIS SPE ATC 00000 0008 Date 9 February 2006 Issue 1 0 Page 26 of 97 Project Office Author Andrew Bom Photometric Requirement TYS Section Basic Stability Detector and Controller non linearity 4 15 Detector and controller gain 5 3 6 Flat field 5 6 5 8 Filter Opaque Filter 5 3 2 Filter Stability 5 3 3 3 Positional accuracy 5 3 3 3 Transmission Stability SRD 4 3 1 2 5 10 3 Other Readout noise pickup test 6 1 8 Slew rotator when tracking open loop 5 1 17 5 Dome light tightness 5 6 5 Offset focus 5 1 18 Table 2 Photometric Requirements VIS SPE ATC 00000 0008 Doc Number Date 9 February 2006 Issue 1 0 Page 27 of 97 Pr ject mr DfA fice Author Andrew Born 4 12 Sensitivity 4 12 1 Sky Brightness Definitions Some later specifications relate to percentages of sky brightness the following sky brightness values Vega system shall be assumed where necessary for calculation however they do not in themselves constitute specifications 1 The intrinsic natural sky brightness is assumed to be as follows independent of lunar phase
10. 2 Only SI units shall be used with the following exceptions degree arcminute arcsec hour minute magnitude the Vega scale Other exceptions may be agreed between VPO and ESO 3 Drawings shall be delivered on paper as well as in electronically readable format Format to be agreed between VPO and ESO and between VPO and QMUL 4 Finite Element Models and results as part of analysis shall be delivered also in electronic form format to be agreed between VPO and ESO and between VPO and QMUL 5 Layouts for electronic circuits shall also be provided in electronically readable format VIS SPE ATC 00000 0008 Doc Number Date 9 February 2006 Issue 1 0 Page 93 of 97 Pr ject mr DfA fice Author Andrew Born 10 Verification and Quality Assurance This section summarises how the requirements listed in Sections 4 amp 5 shall be verified Verification shall be conducted in accordance with a Technical Verification Plan as specified in AD02 10 1 VISTA Test Philosophy Several forms of verification activities shall take place during the design manufacture assembly and commissioning of VISTA These activities shall take place in several locations ranging from sub system manufacturers premises to the commissioning site in Chile 10 2 Performance Verification In addition to the inspections performed as part of quality assurance requirements by each supplier the following three me
11. The 1 Control System shall run on an LCU controlled by the TCS using the similar interface definition as used on the VLT modified in detail only if necessary VIS SPE ATC 00000 0008 Doc Number Date 9 February 2006 Issue 1 0 Page 46 of 97 Pr ject mr DfA fice Author Andrew Born 5 1 13 2 Hardware Interface Hardware shall be controlled via signals transmitted from the M1 LCU on one or more ESO VLT compliant field buses 5 1 14 M2 Unit 5 1 14 1 M2 Unit Functional Requirements 1 The M2 Unit mechanism shall provide adjustment of the M2 mirror in five degrees of freedom any five degrees shall be used that meet the performance requirements 2 These degrees of freedom shall be combined to produce effective motions in focus centring and tilt as shown in Figure 2 and defined in clauses 3 4 and 5 3 Focus shall be defined as movement of the M2 Mirror along the M2 unit z axis nominally co incident with the telescope optical axis 4 Centring shall be defined as movement of the M2 mirror on an ideal sphere with centre located on the M2 Unit z axis and 4018 8 mm behind the mirror vertex when it is co incident with the z axis 5 Tilt shall be defined as movement of the M2 mirror on an ideal sphere with centre located on the M2 Unit z axis and 1050 mm behind the mirror vertex when it is co incident with the z axis Centre of curvature entring Optical axis Focusing
12. The effect of Cassegrain rotator interface accuracy and stability shall be consistent with achieving the overall SIQ performance as per section 4 9 1 2 5 1 16 4 Cassegrain Cable wrap 1 The cable wrap shall be equipped with a dedicated drive system and shall be synchronised with the rotator azimuth axis 2 The cable wrap shall exceed the rotator angular range of travel by a margin of at least 5 beyond the end stops 3 The cable wrap shall be interlocked to the main Cassegrain rotator drive to prevent damage to the cable wrap from differential motion or drive failure 4 The cable wrap shall have capacity for permanent installation of all services for the telescope Cassegrain rotator and IR Camera 5 The cable wrap shall be populated with services for the Cassegrain rotator and IR Camera This will have a similar interface as used in the Auxiliary Telescopes System VIS SPE ATC 00000 0008 Doc Number i Date 9 February 2006 Issue 1 0 gt Page 49 of 97 Pre ject Author Andrew Born 5 1 17 Cassegrain Rotator Control 5 1 17 1 Reuse of ESO Software 1 The rotator axis shall be controlled from LCU s running similar software to the VLTs Rotator Control System 2 This software shall be configured to VISTA s specific requirements 5 1 17 2 TCS Interface The Rotator Control System shall be controlled by the TCS using the similar interface definition as used
13. and shall be capable of resisting motor torque unbalance due to disassembly or MLE external loading Use of a locking pin shall disable the relevant axis drive The pins shall have provision to be tagged out i e a technician can lock out the pin preventing unauthorised removal a minimum locking pin positions specified in Table 4 shall be used for orientation of the telescope for mirror and camera handling operations Accuracy of position 0 05 deg Table 4 Lockout Positions Axis Lockout 1 Lockout 2 Further Lockouts Azimuth 0 45 180 Altitude 0 90 20 Rotator 0 180 90 and 270 5 1 10 10 Brakes Brakes shall be provided both on altitude and azimuth axes The systems shall be equipped with status detection capability for interlock purposes The systems shall be capable of preventing rotation about the axis when the Telescope is not in use stopping the rotation in emergency or when limit switches are actuated The brake systems shall have the capacity to resist the maximum motor torque combined with survival wind loading Doc Number Date 9 February 2006 Issue 1 0 Page 43 of 97 Pr ject mr DfA fice Author Andrew Born VIS SPE ATC 00000 0008 5 1 10 11 Auxiliary drives 1 2 3 An auxiliary drive system shall be provided on the altitude axis The manual drive shall have suitable gearing to allow the Telescope
14. 01000 05000 issue 4 0 VIS ICD ATC 01000 09000 issue 1 0 VIS ICD ATC 01000 10000 issue 1 0 VIS DWG ATC 06000 01000 issue D VIS DWG ATC 06000 04000 issue D VDF SPE QMU 00001 00001 not yet issued VESTA Project Office 2 1 4 Note Safety and Standards Doc Number VIS SPE ATC 00000 0008 Date 9 February 2006 Issue 1 0 Page 13 of 97 Author Andrew Born be used upon approval from the VPO Document Title AD50 VISTA Project Safety Management Plan AD51 Eurocode No 8 Structures in seismic regions Design Part 1 AD52 Recommendations for calculating the effect of wind on constructions European Convention for Constructional Steelwork AD53 General principles for the Safety Design of Technical Products AD54 Safety of machinery Electrical equipment of machines Part 1 General requirements AD55 Protection against electrical shock Common aspects for installation and equipment 56 Electrical installation of buildings ADS7 Safety of information technology equipment ADSS Insulation coordination for equipment within low voltage systems Part 1 Principles requirements and tests ADS9 Intentionally Blank AD60 Hydraulic fluid power General rules relating to systems AD61 Electromagnetic Compatibility EMC including Electromagnetic Pulse EMP and lightning Protection Programme and Procedures Procedures for Systems and Equipment AD62 C
15. 4 4 1 4 Goal n a vis only Comment Compliant filter holder design Partially compliant Met by design Cannot be met Doc Number VIS SPE ATC 00000 0008 Date 9 February 2006 Issue 1 0 Page 95 of 97 Author Andrew Born than 2 4 5 2 3 range 5 1 17 6 4 5 2 4 4 13 1 3 1 4 5 2 5 4 13 1 3 2 4 5 2 6 Goal not specified SRD ADO1 VTS Section 4 5 2 7 4 13 1 4 4 5 2 8 5 1 10 8 2 poss 4 5 2 10 4 8 1 4 5 3 1 4 14 1 4 5 3 2 Goal not specified 4 5 3 3 4 9 1 2 4 5 3 4 4 14 1 4 14 3 at 2 min not 10 min 4 14 3 4 11 and Photometric error budget n a vis only 4 6 3 1 n a vis only 4 6 4 1 4 8 3 5 3 6 1 4 6 5 1 5 3 6 6 4 6 6 1 4 15 1 4 15 2 5 3 6 1 and Throughput budget 4 12 5 5 3 6 1 9 4 6 6 3 Goal 4 15 1 and Throughput budget 4 6 6 4 Goal specified 4 6 6 5 4 15 3 4 6 6 2 11 2 Requirements Mapping from SRD Section 5 7 5 2 1 4 12 2 Comment SRD AD 01 TVS Section 7 1 5 4 16 8 3 Comment Accuracy 5 1 17 8 was deleted Achieved over all sky positions Partially compliant Open loop non sidereal tracking only Open loop non sidereal tracking only Ghosts 4 12 5 Chg bleeding n a vis only Remnants 5 3 6 1 Cannot be met Comment External to firewall ESO and VDFS responsibilities VISTA Project Office 98 5 2 5 Goal 5 2 6 5 2 7 5 4 12 3 and P
16. 5MPa for a duration longer than 24 hours 7 4 6 Hydraulic Safety All hydraulic systems shall be designed in accordance with AD60 7 4 7 Pneumatic Safety All compressed air installations shall be designed in accordance with AD53 7 4 8 Cooling System Safety Cooling systems shall be designed in accordance with the electrical safety requirements and ADS3 7 4 9 Software Safety No software failure or combination of failures shall lead to an unacceptable or undesirable hazard risk the only exception to this principle may be the introduction of means to avoid pointing the telescope at the sun In this context an appropriate hazard assessment mitigation exercise shall be performed Doc Number VIS SPE ATC 00000 0008 4X 1 Date 9 February 2006 Issue 1 0 gt Page 85 of 97 Pre ject Author Andrew Born 7 4 10 Handling Transport and Storage Safety The design of VISTA shall incorporate all means necessary to preclude or minimise hazards to personnel and equipment during assembly disassembly test transport transport on site and short long term storage of VISTA and or parts thereof 7 411 Operational Safety None of the following cases shall lead to an unacceptable or undesirable hazard risk One or two independent operator errors One operator error plus one hardware failure One or two hardware failures One or two software failures Partial or complete loss of energy s
17. 5m diameter this illuminated area must cover the whole of the telescope aperture and is therefore dependent on the field s distance from the telescope 5 The flat field shall be perpendicular to the telescope optical axis when the telescope is pointed at the flat field The flat field light sources shall be installed in the Enclosure and not on the telescope 7 The flat field light system shall provide a minimum of 2 light clusters Each light cluster shall have three independently switched sets of lights i e Select setl or set2 or set3 m 5 6 5 9 Dome Crane A dome mounted overhead crane shall be provided with the following characteristics Doc Number Date 9 February 2006 Issue 1 0 Page 68 of 97 VIS SPE ATC 00000 0008 Pr ject mr tice Author Andrew Born pe 10 11 12 The crane shall be capable of radial access to the azimuth floor The crane shall be capable of reaching the primary mirror handling locations During normal operation the dome shall be interlocked to enable rotation only when the crane is in the park location The dome rotation shall incorporate a manual override to allow rotation with the crane in a maintenance location Safe working load 10 tonne Minimum clear distance 1m from hook in highest position to any telescope structure element Hoist speed variable between 100 and 2000 mm min Horizontal speeds variable between 100 and 2000
18. Andrew Born Telescope Software Comprising the software and associated hardware required for operating the telescope and its sub systems It also includes network equipment specific to VISTA 2 baffle Reflective baffle around the M2 to baffle the IR Camera Site All development activities for site preparation prior to installation of the enclosure Doc Number VIS SPE ATC 00000 0008 Date 9 February 2006 Issue 1 0 Page 19 of 97 r 2 ect tice Author Andrew Born VISTA Telescope Optics amp Telescope Cassegrain Telescope Vis Camera Support Structure Rotator Software IR Camera non deliverable fe di M1 Mirror Fork Rotator Telescope Detectors Detectors Control Sys Wr edi N Rotator Observation Detector Detector Control HW Contro j Controllers Controllers M1 Control Azimuth 7 Apter Corrector i ptics Optics Hardware Track drive J Control SW W p Azimuth Filters Filters MeMirror Control HW Cable Wrap M2 EMU Azimu
19. BITS 23 4 8 2 Visible Camera 23 4 8 3 IR Cam ra Field iue aeu 23 4 9 SYSTEM IMAGE QUALITY ERR 24 4 10 ASTROMBIRY Ae nA c Mo kata AULUS 25 4 10 1 Stability of the IR focal pl ne iie bii ep peek ERU 25 4 10 2 Neutral Density Filter e teet hatte rh tette eot el tar 25 4 11 IPPHOTOMEELRY 25 Doc Number VIS SPE ATC 00000 0008 Date 9 February 2006 Issue 1 0 Page 4 of 97 Pre Author Andrew Born 4 12 SENSITIVITY M E E E 27 4 12 1 Sky Brightness Definitions eese ren rennen enne tne 27 4 12 2 Throne ME 27 4 12 3 Scattered Light seif nsi totom sni 27 4 12 4 JJ EP 26 4 12 5 uy p 26 4 12 6 Liht Leakage Dm 28 4 12 7 System Noise Characteristics eese eene teen 28 413 TARGET ACQUISITION ertet He e Ye EHE HF eti rei 29 4 13 1 29 4 13 2 Acquisition TUNG Em 29 4 14 TRACKING che
20. M1 level shall be measured Doc Number VIS SPE ATC 00000 0008 Date 9 February 2006 Issue 1 0 Page 34 of 97 Pr ject mr DfA fice Author Andrew Born 5 VISTA Subsystem Characteristics and Requirements Text deleted as descriptive 5 1 Telescope Requirements 5 1 1 General Characteristics no text 5 1 2 Telescope Design Volume no text 5 1 3 Telescope related Masses 1 Design moving mass on Cassegrain Rotator shall be lt 2 9 tonnes 2 The mass of the heaviest sub assembly to be lifted during maintenance shall not exceed the capacities of the enclosure crane 10 tonne 3 Provision shall be made for the addition of masses on the Telescope to facilitate balancing 5 1 4 Telescope Dynamic Performance Deleted as descriptive 5 1 5 Telescope Optics Requirements The Telescope optical requirement is such that it shall permit mounting of M1 M2 and the IR Camera in accordance with AD33 5 1 5 1 Optical Design Data The design characteristics of M1 and M2 are defined in AD33 5 1 6 M1 Blank Characteristics Text deleted as descriptive The major geometrical parameters of the blank shall comply with the following Outside diameter of the blank 4100 mm Tolerance on diameter out of roundness 0 5 mm Doc Number VIS SPE ATC 00000 0008 Date 9 February 2006 Issue 1 0 Page 35 of 97 Project C Office pu Ahdrew Borm Diameter of centre hole 1200
21. Number Date 9 February 2006 Issue 1 0 Page 77 of 97 Pr ject mr DfA fice Author Andrew Born 6 Operational requirements 6 1 1 Control of Equipment It shall be possible to operate all equipment required for observing and normal calibration procedures from the Cerro Paranal Control Building 6 1 2 Independent Operation of Cameras 1 Each camera shall be capable of being operated maintained and tested without interfering with the other camera 2 Each camera shall be capable of being operated stand alone off the telescope 6 1 3 Engineering Calibration Procedures Calibration procedures shall where feasible be implemented in software These procedures shall 1 Record all changes so that it is possible to revert to previous calibrations and perform trend analysis 2 Record all raw data used to generate new calibrations e g FITS files in the archive 3 capable of being initiated and run automatically whilst remaining under control of the operator 6 1 4 Observing Modes 1 The normal method of observing shall be queue scheduling in which observations are completely specified in advance using P2PP together with any other specific associated tools agreed with ESO s DMD 2 The operator shall be able to override any automatic operation and control observing directly 6 1 5 Observing and Engineering Logs All observations including calibrations shall be logged All significant enginee
22. Toilet and washroom facilities shall be provided 5 7 9 Heat Exchange 1 A cooling circuit shall be provided for cooling of equipment and air conditioning heat exchange 2 The chiller shall be mounted remotely from the Enclosure 3 Charge tanks and boost pumps may be installed as necessary 5 7 10 Storage no text 5 7 11 Computing Facilities no text VIS SPE ATC 00000 0008 Doc Number Date 9 February 2006 Issue 1 0 Page 74 of 97 Pr ject mr tice Author Andrew Born 5 8 Coating Plant 5 8 1 General Description The Coating Plant shall be situated in the auxiliary building immediately adjacent the basement outer wall The plant consist of two sections designated the lower and upper vessel The vessel shall mount all systems necessary for coating the primary mirror and secondary mirror The control systems including the pumping station heat exchange gas supply and magnetron control panel shall be housed in the coating plant room 5 8 2 Coating the Primary Mirror Deleted as descriptive 5 8 3 Lower Vessel 1 The lower vessel shall include a rotating whiffle tree arrangement to mount the primary mirror For safe mounting earthquake lateral restraints shall engage the mirror 2 The whiffle trees shall mount on a rotating drive which shall revolve the assembly and mirror at a pre determined rate for mirror coating quality 3 The lower vessel shall be mounted on rails to
23. against predetermined requirements and if necessary alert the operator 2 Be capable of being initiated and run automatically whilst remaining under the control of the operator 3 Log all procedures whether successful or not VIS SPE ATC 00000 0008 Doc Number Date 9 February 2006 Issue 1 0 Page 80 of 97 Pr ject mr DfA fice Author Andrew Born 4 Log relevant data so that trend analysis can be performed 7 3 2 Maintenance Approach ESO shall operate VISTA and perform the on site maintenance Therefore the maintenance philosophy to be considered during the design of VISTA is the one established by ESO at the Cerro Paranal Observatory The major elements of this philosophy are as follows 1 The maintenance work load and therefore manpower at the Chilean site shall be minimised and shall be limited as far as possible to preventive maintenance tasks 2 Maintenance work shall be performed at system level and by exchange of module Line Replaceable Units LRUs when practical 3 LRUs are defined as units which can easily i e without extensive calibration etc be exchanged by maintenance staff of technician level and that can be easily shipped to a suitable ESO repair location or to an industrial supplier for repair 4 This concept implies that spare LRUs shall be available at the Observatory 5 Standardisation of equipment fully applicable to VISTA is given in applicable documen
24. allow it to be driven into the basement for installation and removal of the mirror 5 8 4 Upper Vessel The Magnetron and vacuum systems shall be mounted through the upper vessel The upper vessel shall be raised on four screw jacks to open the vessel and allow the lower vessel to move on the rail system 5 8 5 Magnetron Three magnetrons shall be installed in the upper vessel Each shall consist of a magnetron water cooled with copper backed targets The following targets shall be provided Al Target for testing the system and individual magnetrons Ag reflective coating target NiCr adhesor layer target Ag protective layer target silicon Al reflective coating target i 5 8 6 Vacuum Pumping Equipment 1 The vacuum shall be achieved through a cryo pumping system 2 Two cryo pumps shall be installed in the upper vessel with gate valves capable of three position control closed fully open and intermediate pumping The system shall be equipped with a Rootes style roughing pump set 3 Pumping shall be fully automated VIS SPE ATC 00000 0008 Doc Number Date 9 February 2006 Issue 1 0 Page 75 of 97 Pr ject mr DfA fice Author Andrew Born 5 8 7 Power Requirements Peak demand estimated to be 120kW shall be within the capacity of the installed electrical supply infrastructure Note during coating operations normal Enclosure HVAC system operation will not be r
25. and observing time is lost Overhaul involves removal of the equipment VIS SPE ATC 00000 0008 Doc Number Date 9 February 2006 Issue 1 0 Page 81 of 97 Pr ject mr DfA fice Author Andrew Born from the telescope for partial or total disassembly For VISTA limited overhauls lasting up to 48 hours can be undertaken during the periodical re coating of the primary mirror provided they do not impact the coating process Overhauls which would require the loss of more than 3 observing nights shall not take place more often than every 3 years 7 3 3 Monitoring amp Test routines Software routines shall be used to facilitate maintenance and fault detection and location As a general rule two monitoring and test levels are to be considered 1 Monitor level executed continuously as a background task by the LCUs shall carry out checks such as Interlock system power supply level temperatures positions correct execution of commands other variables and signal as required by the system controlled by the specific LCU The selection of which parameter has to be monitored also some not included in the above list depends on the criticality of the parameter for the overall safety and performance Monitored parameters shall be stored in the local database to be accessible from the central control software The list of all parameters being monitored shall be already identified at the design leve
26. at a reduced speed to the software limit in maintenance mode 3 Software Limits Software limit protections shall be programmed in the LCU controlling the axis They shall decelerate the telescope to a complete stop before it reaches the Doc Number VIS SPE ATC 00000 0008 i Date 9 February 2006 Issue 1 0 gt Page 42 of 97 rc ject Author Andrew Born vicinity limit It shall be possible to drive a telescope out of a software limit towards the operational range Vicinity Limits Vicinity Limits hardware switch shall decelerate the telescope using the motor torque LCU controlled deceleration to a complete stop before it reaches the Interlock limit switch It shall be possible to drive the telescope out of a vicinity limit towards the operational range Interlock Limits In the event that the telescope reaches an Interlock Limit hardware switch the latter shall de power the drives and actuate the brakes by hardware connection such that the telescope is decelerated from the maximum safe speed down to a complete stop before it reaches the end stops End Stops There shall be devices e g cushioned end stops or other means capable of decelerating the telescope from maximum safe speed to a complete stop without damage to the telescope and all mounted equipment 5 1 10 9 Telescope Lockout Pins shall be provided to prevent rotation about the azimuth altitude and rotator axes
27. capacity for permanent installation of all services for the telescope Cassegrain rotator and IR camera 4 The cable wrap shall be populated with services for the telescope M2 Unit Cassegrain rotator and IR camera 5 1 9 8 Adjustment and balancing 5 1 9 8 1 Telescope Upper Structure Alignment to Centre Section The alignment tolerances for the telescope truss shall be consistent with achieving the overall SIQ performance as per section 4 9 1 2 This shall include the effect of the interface that is split to allow removal of the M1 Mirror from the M1 Cell for coating 5 1 9 8 2 Balancing 1 There shall be provision for the addition of masses on the Telescope structure to enable the balancing around the altitude axis 2 Once balanced the residual torque around the altitude axis shall be lt 200 Nm in any orientation of the Telescope Tube 3 Provision shall be made for the fine tuning of the telescope tube balancing 5 1 10 Axis Control VIS SPE ATC 00000 0008 Doc Number i Date 9 February 2006 Issue 1 0 gt Page 40 of 97 Pre ject Author Andrew Born 5 1 10 1 Reuse of ESO Software Deleted as descriptive 5 1 10 2 TCS Interface The Axis Control System shall be controlled by the TCS using a similar interface definition to that used on the VLT modified in detail only if necessary 5 1 10 3 Software Hardware Interface The interface between VISTA hardware a
28. for all major lifts Additional craneage shall be supplied as follows 1 A wall mounted jib crane shall be fitted in the camera service area capacity 1 tonne 2 A wall mounted jib crane shall be fitted in the area designated for mirror stripping capacity 1 tonne 3 Overhead rail crane to be installed within Auxiliary Building capacity 1 6 tonne Doc Number VIS SPE ATC 00000 0008 4X 1 Date 9 February 2006 Issue 1 0 Em Page 76 of 97 Pre Author Andrew Born 5 9 3 Basic Handling Equipment The following basic handling equipment shall be provided 1 Manual pallet trolley capacity 5 tonne 2 Slings and shackles as necessary 5 9 4 Special Handling Equipment The follow special handling equipment shall be provided 1 Top end handling tool 2 Primary mirror handling tool 3 M2 handling equipment 4 Camera removal and handling equipment Some functions may be duplicated and where beneficial special equipment can be dual purpose 5 10 Test Equipment 5 10 1 Test Camera Not verifiable for internal VPO use only 5 10 2 A reflectometer shall be provided to measure the performance of the Coating Plant 5 10 3 A monochromator or similar test device for monitoring long term stability of filter transmission curves shall be provided The instruments of 5 10 2 and 5 10 3 may be combined into a single device VIS SPE ATC 00000 0008 Doc
29. mm Concentricity of centre hole with outer diameter 0 5 mm Nominal thickness 170 5 mm Radius of convex surface 8 3 Surface finish concave surfaces edges D76 Preliminary values of residual stresses compressive are Mean absolute value 10 nm cm Maximum absolute value 20 nm cm Coefficient of Thermal Expansion CTE 0 0 07 10 K Homogeneity of thermal expansion coefficient in the blank lt 0 02 10 9 K 517 Mirror Optical Characteristics VISTA shall incorporate an active mirror The optical specification takes into account the active optics correction capability of the system This specification covers Low spatial frequency errors These are the errors that can be removed from the final figure of the M1 mirror by use of the active optics capability of the system High spatial frequency errors These are the residual surface errors after removal of the low spatial frequency errors defined above 5 1 7 1 Mirror Optical Prescription The design characteristics of M1 shall be in accordance with AD33 5 1 7 2 Low Spatial Frequency Errors Incorporated into 5 1 7 3 5 1 7 3 Optical Quality 5 1 7 3 1 M1 Test Set up 1 The primary mirror shall be tested on a support system with the same geometry and interfaces as the final support system of the M1 Cell as defined in AD35 2 The testing process shall ensure effective removal of the axial print through with the M1 mirror pointing a
30. mm min Radio Frequency RF remote control Any RF transmission links shall be robust to interference by similar local systems such as the dome RF link and shall comply with relevant certification standards Manual control with velocity control joysticks for the Enclosure and crane shall be implemented these shall default to slow speed and shall have a fast speed enabled on holding down an override button A hardware signal shall be provided from the crane to indicate when the crane is in use or out of its park position It shall be possible to inhibit crane operation by means of an external hardware input signal 5 6 5 10 Maintenance Platform l 2 A mobile access platform shall be installed the azimuth floor level to enable safe access to the telescope and other maintenance locations Alternative access arrangements shall be installed where required for access to and maintenance of the various Enclosure installations where the access platform cannot be utilised 5 6 6 Basement 5 6 6 1 General Requirements 1 The circular external wall of the Enclosure base shall be concentric with the telescope pier In the volume between pier and Enclosure base wall there shall be service rooms to house the equipment required for telescope operation A mirror and instrument handling area shall be accommodated directly below the hatch Foundations and structure of the Telescope pier and the Enclosure shall remain isolated from each
31. other to minimise the transmission of wind induced vibrations vibrations resulting from the Dome rotation and any other possible vibration source The Enclosure base shall provide access doors for personnel and equipment to the Enclosure and the staircases shall be installed in this access area The Enclosure base shall provide access to the Auxiliary Building Coating Plant room by means of a roller door or similar 7 Doc Number Date 9 February 2006 Issue 1 0 Page 69 of 97 Pr ject mr DfA fice Author Andrew Born VIS SPE ATC 00000 0008 On the upper part of the Enclosure base an embedded beam suitable to receive the circular rail or equivalent for the rotation mechanism of the Enclosure shall be installed 5 6 6 2 Access 1 2 A mezzanine floor shall be provided at a suitable level to access the azimuth bearing and motors of the Telescope for maintenance purposes The basement shall incorporate two stairs to access the mezzanine and azimuth floors and to provide emergency exit routes from the enclosure 5 6 6 3 Vibration no text 5 6 6 4 Drainage no text 5 6 6 5 Equipment Housing no text 5 6 6 6 Primary Mirror Washing Requirements 1 2 An area in the basement designated for primary mirror stripping shall be provided with cast in drainage leading to an external storage tank The mezzanine and azimuth floor levels shall provide space above the stripping area
32. rnnt 10 1 3 EXCEUSION S 5 58 cl SIM MU MI MI MUI E 10 1 3 1 Development RE aE aa 10 1 3 2 Supply of Visible Camera 10 2 APPLICABLE AND REFERENCED 2 11 2 1 APPLICABLE DOCUMENT s ERE aree ERES 11 2 1 1 Science Requirements Documents and Verification Strategy 11 2 1 2 ESO Applicable Documensts esee entente nennen ener enne trennen teinte nennen 11 2 3 nterface Control Documents rpete ietsie ies in rini anso aTa eri roaa NI E IRE ERRE iE 12 214 tt Ea 13 2 2 REFERENCE DOCUMENTS ccessseceesssceceesaeeececeececueeecsesueseceeneececsaeeecsesueesceesaeescseeecsesaeeecseseeeeeseeeeenes 14 3 SYSTEMS 8 25408 15 3 1 PHYSICAL DESCRIPTIONH REEF ee Ebr EE Leer REESE ROTER FERRE 15 3 2 15 3 3 PRODUCT TREE AND SUB SYSTEM 17 3 3 1 saedssbdsssacasabacatabassceiapenaeieadeaasasats 17 3 3 2 S
33. zenith that the telescope cannot track in azimuth Where numerical values of deviations are given unless they are qualified e g by rms they are to be taken as maximum absolute values Doc Number VIS SPE ATC 00000 0008 Date 9 February 2006 Issue 1 0 Page 10 of 97 Pr ject mr DfA fice Author Andrew Born 1 SCOPE 1 1 General The purpose of this document is to define all the technical acceptance criteria of the VISTA system in accordance with 02 1 2 Requirements Capture and Verification 1 2 1 SRD Requirements Capture While translating the requirements of the SRD AD01 into System Requirements the following guidelines have been used Requirements contained the SRD ADO1 have been translated into engineering requirements only if they constitute a Technical Specification Such requirements shall be detailed in this Technical Verification Specification in a form that is quantifiable and verifiable such verification will be developed as part of the Acceptance strategy 1 2 2 Verification Strategy Verification of technical requirements shall be carried out in accordance with the agreed strategy of ADO2 1 2 3 Traceability To ensure traceability to the Technical Specification RD06 the numbering system herein is consistent with that of the VISTA Technical Specification in accordance with ADO2 section 5 1 2 No text means the equivalent section of the VISTA Technic
34. 00 0008 Date 9 February 2006 Issue 1 0 Page 15 of 97 Author Andrew Born 3 Systems Description of VISTA 3 1 Deleted as descriptive 3 2 Definitions Physical Description The following terms shall be used throughout this Verification Specification with the meaning herein Term VISTA Vista Project Office or VPO Sub System Camera Integration Exposure Exposure Sequence Observation Altitude Definition The object of this specification comprising the design manufacture testing and integration the sub systems into a fully integrated astronomical facility and subsequent commissioning of this facility The management organisation entrusted with the procurement of the VISTA Part of the works comprising one or more workpackages and which are defined in Section 3 3 2 For the purposes of the VISTA project the IR and Visible scientific instrumentation shall be described as the IR Camera and the Visible Camera A simple snapshot within the Data Acquisition System DAS of a specified elapsed time This elapsed time is known as the integration time The stored product of many individual integrations which have been co added in the Data Acquisition System DAS Each exposure is associated with an exposure time The stored product is a single FITS file A series of exposures All necessary operations required completing an exposure sequence and preparing for
35. 1 0 Page 83 of 97 Pr ject mr DfA fice Author Andrew Born 7 4 Safety Safety of equipment and personnel shall be in accordance with AD50 VISTA Project Safety Management Plan According to the general rules of AD50 non standard equipment specifically designed and built for VISTA shall be designed to ALARP As Low As Reasonably Practicable principles which means that an Hazard analysis based on a probabilistic risk assessment is used to identify hazards to determine their severity and acceptability The overall criteria for the review of the Hazards shall be as detailed in AD50 Hazards shall be treated in order that they reach ALARP status 7 4 1 Hazard Risk Acceptance Criteria 7 4 1 1 Hazard Severity no text 7 4 1 2 Hazard Probability no text 7 4 1 3 Hazard Risk Category no text 7 4 2 General Safety Requirements The general principles of safety design of technical products defined in AD53 and AD54 shall be applied 7 43 Mechanical Safety 1 A minimum safety margin of 1 5 with respect to sigma 0 2 has to be used in the design of all those mechanical components which in case of a failure lead to an Unacceptable or Undesirable hazard risk as defined in AD50 2 Transport lifting hoisting devices and similar equipment shall be approved by an officially recognised independent verification agency 7 4 4 Protection against electric shock and other hazards 7 4 4 1 Introduction The low vol
36. 1 18 4 Sensor Implementation Deleted 5 2 Visible Camera Deleted as not relevant to verification of deliverables 53 IR CAMERA 1 The IR Camera shall comply with the requirements of AD33 AD34 AD39 and AD40 2 To avoid re balancing the telescope between camera changeovers in the event that a Visible camera is commissioned at a later date the IR camera has a centre of gravity defined relative to the Telescope structure Cassegrain mechanical interface 5 3 1 Infrared Camera Optics 5 3 1 1 Infrared Camera Optical design characteristics 1 Unvignetted field of view 1 65 degrees diagonal 2 Deleted as duplicate of section 4 7 3 Plate scale 58 52 um arcsec subject to meeting the SIQ requirements of 4 9 1 2 VIS SPE ATC 00000 0008 Doc Number Date 9 February 2006 Issue 1 0 Page 52 of 97 Pr ject mr DfA fice Author Andrew Born 5 3 1 2 Infrared Camera Optical Interface The IR Camera shall utilise the optical input characteristics defined in AD33 5 3 2 IR Filters 1 Three science filters sufficient to cover the focal plane and an opaque filter shall be provided for use in the IR camera 2 The science filters shall correspond with J and as defined in Table 6 3 no text Band J H Ks Centre Wavelength um 1 23 1 65 2 15 Tolerance 0 5 0 5 0 5 Bandwidth FWHM um 0 18 0 30 0 30 Tolerance 5 5 5 Table 6 Filter Passbands
37. 10 N Resolution 1 5 N Lateral definer performance Total stiffness gt 1 2 10 N m Maximum force limiter setting 5000 N The linkage between the mirror and supports shall use low friction rolling element bearings in the pivots The performance shall be such that Max frictional torque in the linkages at mirror rim lt 150 Nnm 5 1 11 6 Restraint mechanism shall be provided to restrain the mirror when operating at low altitude angles the design of the mechanism shall take into account potential earthquake loads 5 1 11 7 Requirement for the Cassegrain Interface Flange The effect of Cassegrain rotator mounting stability and accuracy shall be consistent with achieving the pointing and tracking accuracy as per sections 4 13 4 14 and with achieving the overall SIQ performance as per section 4 9 1 2 The Cassegrain flange shall include features for ensuring repeatability of the mounting of the Cassegrain rotator 51 12 Cell Thermal requirements 5 1 12 1 Cooling of heat sources no text 5 1 12 2 Thermal Conditioning of Primary Mirror Active cooling of the primary mirror will not be provided the primary mirror temperature shall be regulated by means of Enclosure air conditioning during the daytime and and ventilation whilst observing The design of the telescope Telescope structure and M1 Cell shall accommodate openings for flushing the primary mirror in operation 5 1113 MI Control 5 1 13 1 TCS Interface
38. 18 2 1 Guiding 1 The autoguider shall deliver a user selectable frame rate up to 10Hz 2 Centroiding accuracy shall be commensurate with meeting the SIQ requirements 3 Guide star acquisition probability gt 99 4 deleted as not specific VIS SPE ATC 00000 0008 Doc Number Date 9 February 2006 Issue 1 0 Page 51 of 97 Pr ject mr tice Author Andrew Born 5 1 16 2 2 LOWFS 1 The LOWFS shall operate concurrently with observations 2 The LOWFS shall have 99 probability of finding a usable star assuming the telescope pointing is near a galactic pole with a full moon and no clouds 3 Sample rate lt 1 minute 4 Integration time gt 30s 5 no text 6 The LOWFS shall yield as a minimum M2 focus M2 tilt M2 decentre M1 astigmatism corrections 7 The accuracy of each term shall be commensurate with meeting the SIQ requirements 8 The LOWFS shall monitor the health of the wavefront and alert the operator of deterioration in image quality 5 1 18 2 3 1 The HOWFS shall be capable of fully determining the force correction of the 2 HOWFS shall provide the first 15 mirror modes NB non axisymmetric mirror patterns are counted as two independent modes 3 The accuracy of each term shall be commensurate with meeting the SIQ requirements 5 1 18 3 Sensor Location The sensors for guiding and wavefront sensing shall be integrated into the Cameras 5
39. 23 9 Infrared Camera Opis deed e deett ep 51 5 3 2 Hg p 52 Doc Number VIS SPE ATC 00000 0008 Date 9 February 2006 Issue 1 0 Page 5 of 97 Pre Author Andrew Born 5 33 Filter Mechanism Assembly 52 5 34 Camera Structure Assembly eese eee 52 BE MENO ATE 52 5 3 6 Focal Plane Unit Assembly esee eee 53 5 3 7 Camera Guiding and Wavefront Sensing esee ener 54 5 4 CONTROL A PET AEE E T 55 5 4 1 Control Hierarchy Block Diagrams 55 IA set hM 56 ReguirementS 57 5 5 DATA HANDLING 59 nn AME IPIE 59 DIZ Block Diagram sioe ie e PUER EISE I ee TENERE 60 XII Product Iree ES 60 2254 m mE 61 5 6 IBN CLOSURE 63 3 6 4 Purpose of the o O EE 63 RT 2 74 1111 RE mE 63 5 NEM Ug 63 5 6 4 General Requirements Applicable to the Enclosure eese eee 63 R
40. 6 Issue 1 0 Page 57 of 97 rc ject tice Author Andrew Born VISTA Control Telescope Instrument Control Control _ Observation TCS Software _ Instrument Altitude Contol Sys Control _ Detector Azimuth Control Control Guiding and WFS Rotator Control Observer Support M1 Control Maintence amp Verification M2 Control Enclosure Control Figure 5 Product tree for VISTA control 5 43 Requirements 5 4 3 1 LCU Hardware Where software is required to control hardware directly or is required to have deterministic performance it shall run on a VME VxWorks based computer system conforming to the requirements and constraints of an ESO LCU AD21 5 4 3 2 Unix Hardware Where software is not required to control hardware directly or to have deterministic performance it shall run on a Unix workstation conforming to the requirements and Doc Number Date 9 February 2006 Issue 1 0 Page 58 of 97 Pr ject mr tice Author Andrew Born VIS SPE ATC 00000 0008 constraints of an ESO workstation In this context a workstation may actually be a server not used directly by a human operator 5 4 3 3 Visible and IR Cameras deleted as not relevant to deliverables 5 4 3 4 Location of Computing Equipment 1 2 4 All LCUS shall be located in the VISTA telescope e
41. Doc Number Date 9 February 2006 Issue 1 0 Page 73 of 97 Pr tice Author Andrew Born 5 7 3 6 Emergency Shower Shall be provided and available at all times in the event of chemical contamination from for example spillage whilst undertaking the Mirror Wash process 57 44 Transformer Room Power Substation 1 A suitably rated dry resin type transformer and the required Medium Voltage switch gear to step down the Paranal power supply shall be provided The transformer shall be installed in a dedicated room within the auxiliary building subsumed into 1 Under normal operating observing conditions the peak load will be lt 250 kVA When the Mirror is being coated the peak load will be lt 300 kVA i pe po 57 5 Electrical Power Distribution Room 1 Low Voltage switchgear and distribution panels shall be provided 2 It shall be installed a dedicated room within the Auxiliary building 3 This room shall be directly accessible from the Enclosure 4 UPS power shall be provided with a rating of at least 20 kWh 5 7 6 Plant Room 1 compressor air dryer and air receiver shall be provided in a plant room in the Auxiliary building 2 This room shall house additional service equipment 5 7 Office rest area 1 An office and document store shall be provided 2 This room shall be equipped for network communications and heating and ventilation 5 7 8 Sanitary Provision
42. LANs Documents AD 29 AD 30 intentionally blank Interface Control Documents Document Title AD31 AD32 AD33 AD34 AD35 AD36 AD37 AD38 AD39 AD40 AD41 Note Interface Control Document between the Paranal infrastructure and VISTA ICD between VLT Control System and Observation Handling System Telescope Optical Interface to IR Camera Telescope to IR Camera Services Interface Control Document Primary Mirror to Primary Mirror Cell Interface Control Document Telescope Structure to M2 System Interface Control Document Interface Control Document Between the Telescope Structure and the Site Development Interface Control Document Between the Telescope Structure and the Enclosure Instrument Interface to telescope Mechanical Interface with Cassegrain Focus Instruments VDFS Requirements for VISTA Data Information Documents AD 42 49 intentionally blank Doc Number VIS SPE ATC 00000 0008 Date 9 February 2006 Issue 1 0 Page 12 of 97 Author Andrew Born VLT SPE ESO 17240 0385 issue 3 GEN SPE ESO 19400 0794 issue 2 0 VLT MAN ESO 17230 0942 issue 2 VLT MAN ESO 17220 1332 issue 4 VLT MAN ESO 17210 0619 issue 2 4 VLT SPE ESO 17120 1355 Issue 2 Document Number and Issue VIS ICD ATC 10000 00000 issue 1 VLT ICD ESO 17240 19200 issue 2 VIS ICD ATC 01000 06000 issue 2 0 VIS ICD ATC 01000 04020 issue 5 0 VIS ICD ATC 02000 03000 issue 2 0 VIS ICD ATC
43. Lifetime VISTA shall be designed for a minimum lifetime of 15 years of operation comprising an average 12 hours of observation and 12 hours of stand by per day 7 2 System Reliability 7 2 1 Overall Availability 1 The system shall be designed and manufactured in order to ensure that the non scheduled down time does not exceed 596 of the observing time 2 During the initial year of operations the non scheduled down time shall not exceed 15 of the observing time 7 3 2 Specific Reliability Requirements A Failure is defined as an event causing complete loss of observing capability and which cannot be recovered by corrective maintenance including fault identification in less than 4 hours 1 Major subsystems of VISTA shall be designed for a Mean Time Between Failures MTBF of 3 years As a minimum this shall apply to the following subsystems e Telescope including drive and control system e MI Cell e 2 Electromechanical Unit e Enclosure e Instruments 2 Although MTBF criteria may not be suitable for equipment used only occasionally example Coating Plant a high reliability shall be enforced in the design and manufacturing process by appropriate methodology and review 7 3 Maintainability Guidelines and Requirements 7 3 1 Guidelines for Diagnosis and Maintenance by Software As a general rule Maintenance procedures shall where feasible be implemented in software These procedures shall 1 Check performance
44. Local Area Network as defined in these documents 4 5 Reference Frame Definition The co ordinate system requirements detailed in ADO3 shall be applied to all levels of VISTA Local co ordinate systems linked to telescope telescope assemblies and other parts of VISTA are defined as necessary in accordance with the requirements of ADO3 VIS SPE ATC 00000 0008 Doc Number i Date 9 February 2006 Issue 1 0 gt Page 23 of 97 Pre ject Author Andrew Born 4 6 Telescope Aperture 1 The telescope shall have a primary mirror of diameter gt 4m 2 diameter of the equivalent clear aperture taking into account the telescope pupil at the secondary mirror shall be gt 3 7 m 4 7 Wavelength Coverage VISTA shall be capable of operating over the wavelength range 0 95 microns to 2 40 microns with the IR Camera Table 1 Deleted see Table 6 4 8 Sky Coverage 4 8 1 Zenith Distance 1 The system shall operate and meet its specifications at zenith distances 2 to 70 at all azimuth angles The region within 2 radius of the zenith is referred to as the zenith blind spot 4 8 20 Visible Camera Field no text 4 8 3 IR Camera Field 1 The IR Camera shall provide an available field of gt 1 6 diameter This shall unvignetted compared to the centre of the field except for the outermost 25 by radius which may be vignetted by up to 3 compared to the centre of t
45. OSHH Regulations AD63 ESO Safety Policy Document Number and Issue VIS PLA ATC 00001 0019 Commission of the EC Report EUR 12266 EN 1988 ECCS Technical Committee 12 wind report no 52 274 edition DIN 31000 1979 03 including DIN VDE 31000 2 1987 12 2 1 4 1 1 1 EN 60204 1 1997 2 1 4 1 1 2 IEC 61140 IEC 60364 IEC 60950 3 edition IEC 60664 1 Ed 1 1 ISO 4413 1998 2 edition VG 95 374 Part 4 Framework Directive98 24 EC In lieu of DIN standards equivalent national standards or European directives can Issue 3 0 1988 1997 1979 1987 1997 1997 11 2001 1999 04 2000 04 1998 1999 Doc Number VIS SPE ATC 00000 0008 Date 9 February 2006 Issue 1 0 Page 14 of 97 Pre Office Author Andrew Born 2 2 Reference Documents Reference documents provide background information for use as appropriate Document title Doc Number RDO1 Interface Control Document Between Telescope Structure VLT ICD ESO 11310 11210 issue 3 and M2 Unit RD02 IRACE Design Description VLT TRE ESO 14100 1654 Issue 2 0 RD03 Reflecting Telescope Optics II Wilson R N ISBN 3 540 60356 5 Springer Verlag RD04 Operational Concept Definition Document OCDD VIS SPE VSC 00000 0002 issue 1 05 VISTA Project Overview VIS TRE ATC 00000 0004 Latest Issue RD06 VISTA Technical Specification VIS SPE ATC 00000 0003 Issue 3 0 VISTA Project Office Doc Number VIS SPE ATC 000
46. Physical Flatness The array flatness shall be consistent with achieving the overall SIQ performance as per section 4 9 1 2 Well Depth The detectors shall possess well depth at least 100ke defined as the number of electrons above which the response non linearity becomes gt 5 VIS SPE ATC 00000 0008 ren Doc Number Date 9 February 2006 Issue 1 0 gt Page 54 of 97 Pre Author Andrew Born 5 3 6 2 Detector Controller The IR Camera shall use a 256 channel ESO IRACE Detector Controller RD 02 to acquire data from the detector arrays 5 3 6 3 Detector Pre amps and Circuitry Deleted as descriptive 5 3 6 4 Temperature Sensors Cabling and Connectors no text 5 3 7 IR Camera Guiding and Wavefront Sensing Requirements from this section have been moved to 5 1 18 2 A Project Office 5 4 5 4 1 Control Broker for Obs Blocks BOB Control Hierarchy Block Diagrams Doc Number VIS SPE ATC 00000 0008 Date 9 February 2006 Issue 1 0 Page 55 of 97 Author Andrew Born QC Pipeline Archive System A Observation Software 05 Headers Instrument Telescope Guide focus Control Software WFS Software Raw data ICS Vv Telescope Sensors Detectors Data Hardware Mechanisms Storage Media Figure 3 T
47. SO s On Line Archive System software Components of the VLT archive software shall run on VISTA hardware i e the Instrument Workstation and the Data Handling Workstation The VISTA Data Handling Workstation shall send data to the Paranal Observatory s Archive hardware via the local area network 5 5 4 8 Hardware and Data Rates 1 The data handling hardware shall include the workstations listed in Table 7 2 Each workstation shall be able to store data at the rate and volume specified in Table 7 Workstation Data Capacity Storage Rate IR Camera Instrument WS 2 8 TB 54 MB s Data Handling 2 8 TB 27 MB s Archive 2 8 TB 27 MB s User 2 8 TB 14 MB s Pipeline 2 8 TB 27 MB s Table 7 Workstations that handle instrument data 3 These workstations exist as discrete entities in the VLT architecture adopted by VISTA ESO and VPO may agree that software functionality may be distributed across fewer workstations in which case the disk capacities required will reduce accordingly The IR Camera IWS will be procured within the IR Camera work package The Archive Workstation will be the Paranal Observatory s system AU Doc Number VIS SPE ATC 00000 0008 i Date 9 February 2006 Issue 1 0 gt Page 63 of 97 Pre ject Author Andrew Born 5 6 Enclosure 5 6 1 Purpose of the Enclosure The Enclosure shall perform three functions 1 The Enclosure shall provi
48. System Failure Mode Effect Analysis For Information Only Full Width at Half Maximum Heating Ventilation and Air Conditioning Hardware Interface Control Document Infra Red Array Control Electronics Instrument Workstation Local Control Unit Lightning and Electro Magnetic Pulse Linear Tape Open Liquid Nitrogen Line Replaceable unit Primary Mirror Secondary Mirror Maximum Likely Earthquake Mean Time Between Failures Mean Time to Repair Operating basis Earthquake Operational Concept Definition Document VISTA Project Office OPD OB OHS OS P2PP PCB PP PTV RMS SCP SIQ SRD SW TCS To VCS VDFS VISTA VPB VPO VTS WFE WS ZD Zenith Blind Spot NOTE Doc Number VIS SPE ATC 00000 0008 Date 9 February 2006 Issue 1 0 Page 9 of 97 Author Andrew Born Optical Path Difference Observation Block Observation Handling Software Observation Software Phase 2 Proposal Preparation Printed Circuit Board Peak to Peak Peak to Valley Root Mean Square Standard Connection Panel Systems Image Quality Science Requirements Document Software Telescope Control System Predicted minimum observing air temperature VLT Control System VISTA Data Flow System Visible and Infrared Survey Telescope for Astronomy VISTA Project Board VISTA Project Office VISTA Technical Specification Wave Front Error Workstation Zenith Distance i e 90deg altitude angle Area around
49. System shall run on an LCU controlled by the TCS using the similar interface definition as used on the VLT modified in detail only if necessary 5 1 15 2 Hardware Interface Hardware shall be controlled via signals transmitted from the M2 LCU By agreement with ESO the M2 control shall be implemented by the LCU CPU sending demands via a serial VIS SPE ATC 00000 0008 Doc Number Date 9 February 2006 Issue 1 0 Page 48 of 97 Pr tice Author Andrew Born interface to Delta Tau PMAC multi axis controller card mounted in the VME backplane of the LCU 5 1 16 Cassegrain Rotator 5 1 16 1 Cassegrain Rotator Bearing I Deleted as descriptive 2 The rotator shall be designed in conjunction with the mirror cell to ensure that bearing performance is predictable and meets its performance requirements over the operational range of the Telescope 3 Rolling element bearings shall be sealed to prevent ingress of dirt 5 1 16 2 Cassegrain Rotator Tracking Requirements The Cassegrain rotator performance shall be consistent with achieving the pointing and tracking accuracy as per sections 4 13 4 14 and the overall SIQ performance as per section 4 9 1 2 5 1 16 3 Cassegrain Rotator Interface The Cassegrain rotator interface with the Camera shall meet the requirements of AD40 The rotator shall incorporate a mounting surface with features to ensure repeatable mounting of the cameras
50. T MEE I mS 66 BENE eL 68 80 47 HVAC 69 3 0 0 Enclosure Control System tee Ie p RH epe Ele dies nave Ene nne ea en vl pue Bree ky ee 70 3 0 9 Telescope Plen ste eee ne epe Hu tav ae 71 5 7 AJXUXIETARY BOUIPMENT cutee e 12 D 72 3 42 Equipment Locatiofi tre 72 AS E R 72 5 7 4 Transformer Room Power Substation eese esee eene 73 5 75 Electrical Power Distribution Room esee netten teen nenne tren eene 73 DO Plant ROOM P E E 73 3 47 73 3440 JSanilary 73 2 79 Heat Exchange ienne snoeren aeeiiaii 73 5 7 10 pepe CREE 73 5 7 11 COMPUTING uli T 73 5 8 COATING PEANT seriinin ideesse E M 74 9 94 General DeScriptiOR s ete tte IE E E EE NE E E E E E 74 25 5 2 Coaimpihe Primary MIFFOF ise et ty E e nang 74 23 03 Lower Vessel E dee 74 38 4 Upper Vessel t E E A eate E E E eis 74 DOD Maeneo ii sese
51. TAL Document Title Document Number Visible amp Infrared Survey Telescope for Astronomy Project Office lel 44 0 131 668 8411 Fax 44 0 131 668 8412 Email vista roe ac uk WWW http www roe ac uk atc vista VISTA Technical Verification Specification VIS SPE ATC 00000 0008 Issue Issue 1 0 Date 9 February 2006 Digitally signed by Andy Document Andrew Born An dy Prepared Signature and Date UK O UK ATC OU VISTA Systems Engineer VISTA Born Document A McPherson Signature and Date 2 McPherso Released By Project Manager 6 A 2006 02 09 2 16 40 35 7 Reviewed By Digitally signed by Will Sutherland Will Sutherland Will iml OU Institute of Astronomy VISTA Project Scientist Signature and Date Sutherland sss Date 2006 02 13 14 38 31 Z Accepted on Richard Wade E H h r Digitally signed by Richard Wade DN cn Richard Wade c GB behalf of Director Programmes Signature and Date DAN or Bichard Wd oem s Research Council ou 0 PPARC PPARC Wade 2 1 Digitally signed by Jim Accepted on JIM Emerson H DN cn Jim Emerson c GB behalf of the i o Queen Mary University of a gt i Londo ou Astronomy Unit VISTA Principal Investigator Signature and Date merso Sagal p omerson qmul ac Consortium i Reason am accepting this i n document i Date 2006 02 20 12 13 15 Z The inf
52. acking acceleration maximum Azimuth slew velocity maximum Azimuth slew acceleration Altitude Altitude range maximum Altitude tracking velocity maximum Altitude tracking acceleration maximum Altitude slew velocity maximum Altitude slew acceleration 5 1 10 8 3 Maintenance conditions no text 5 1 10 8 4 Telescope Limits Doc Number VIS SPE ATC 00000 0008 Date 9 February 2006 Issue 1 0 Page 41 of 97 Author Andrew Born South increasing towards East 130 to 310 Tube pointing to horizon 0 to 90 lt 4 0 diameter 130 to 310 480 arcsec s 10 arcsec s 2 0 s 0 5 s 20 to 88 17 arcsec s 0 5 arcsec s 2 0 s 0 5 52 1 Each axis shall be equipped at both ends with a set of limit switches and end stops The location of these switches and stops shall be such as to allow the telescope to decelerate to a complete stop before activation of the next limit In the event that a reduced slew speed is implemented e g to limit the altitude axis overshoot this reduced speed region shall be hardware interlocked to the drive system 2 Operational limits Operational limits shall be implemented in the form of software protections that are programmed in the LCU controlling the axis They shall decelerate the telescope to a complete stop within the maintenance range It shall be possible to drive the telescope out of a software limit under TCS control or drive
53. al Specification v3 was empty Deleted means the equivalent section of the VISTA Technical Specification v3 has been deleted for the reason given usually because it was not suitable for verification 1 3 Exclusions 13 1 Future Development Deleted unnecessary detail 1 3 2 Supply of Visible Camera Deleted unverifiable A Project Office Doc Number VIS SPE ATC 00000 0008 Date 9 February 2006 Issue 1 0 Page 11 of 97 Author Andrew Born 2 Applicable and Referenced Documents 2 1 Applicable Documents The following documents of the exact issue shown form a part of this Technical Verification Specification to the extent specified herein In the event of conflict between the documents referenced and the content of the present specification the order of precedence in 002 shall apply 2 1 1 Science Requirements Documents and Verification Strategy Documents Document Title ADOI ADO2 Strategy for the Preparation of the Verification Plan for the VPO Deliverables to ESO 2 1 2 VISTA Science Requirements Document SRD ESO Applicable Documents Document Title ADO3 AD04 ADOS AD06 07 ADOS ADO09 10 ADII ADI2 AD13 AD14 15 Note AD20 AD21 AD22 Basic Telescope Definitions VLT Environmental Specification Instructions to perform Earthquake analyses for VLT instruments and similar equipment Service Connection Point Tec
54. all point at least 90 degrees away from the wind direction and the Telescope shall be closed for wind speed larger than 18m s Survival wind speed Each subsystem of VISTA has been designed for the relevant expected wind speed taking into account the requirement of Section 4 2 9 1 of 04 including possible accidental condition in case that the Enclosure cannot be closed parts of the telescope may be exposed to stronger wind than the operational wind speed Unless otherwise substantiated by proper design and or analysis the survival wind speed to be used for the design of equipment inside the VISTA enclosure shall be 36 m s The survival wind speed to be used for the dimensioning of buildings and external facilities shall be as per AD04 section 4 2 9 1 4 3 3 3 Earthquakes VISTA has been designed to withstand earthquakes as defined by the requirement of AD04 section 4 2 14 the Operating Basis Earthquake OBE and the Maximum Likely Earthquake MLE The excitation characteristics used are defined in Section 8 1 1 4 Earthquake Analyses 44 External Interfaces 441 Power Distribution The interface of VISTA to the Power Distribution System of the Cerro Paranal Observatory shall be in accordance with AD31 4 4 2 Local Area Network Local Area Networks shall comply with ESO standards as defined in applicable documents AD12 and AD28 or otherwise subject to specific agreement with ESO VISTA shall interface to the Observatory s
55. alled operated and located within the electromagnetic environment specified by ADOS and therefore shall comply with the requirements imposed by ADO08 Applicability 1 VISTA shall be considered part of the VLT Observatory Therefore the general requirement of the VLT observatory are applicable 2 For the purpose of this Specification the requirements applicable to Telescope Area of the VLT Observatory are to be intended as fully applicable to the VISTA Telescope Area Text deleted as duplication of AD contents 8 4 3 Emission As per AD08 ADO9 as appropriate 8 4 3 1 Radiated emission As per ADO9 8 4 3 2 Conducted emission disturbance voltages As per ADO9 VIS SPE ATC 00000 0008 Doc Number i Date 9 February 2006 Issue 1 0 gt Page 90 of 97 Pre ject Author Andrew Born 8 4 3 3 Conducted Emission harmonic currents As per ADO9 8 4 3 4 Conducted emission voltage fluctuations As per ADO9 8 4 3 5 Conducted emission disturbance currents As per AD08 ADO9 as appropriate 8 4 3 6 Immunity As per AD08 ADO09 as appropriate or otherwise agreed between ESO amp VPO 8 4 3 7 Input and output if any AC power ports As per AD08 ADO9 as appropriate 8 4 3 8 Control signal ports As ADO9 8 4 3 9 Enclosure port As ADO9 8 4 3 10 Input and output DC power ports if any As ADO9 8 5 Nameplates and product
56. arger 4 15 3 Time Stamping The absolute timing of each exposure shall be recorded so as to permit reconstruction of the absolute UT of mid exposure at each pixel to X 0 15 VIS SPE ATC 00000 0008 Doc Number i Date 9 February 2006 Issue 1 0 gt Page 31 of 97 Pre ject Author Andrew Born 4 15 4 Exposure Rate and Readout 4 15 4 1 Visible Camera no text 4 15 4 2 IR Camera Using the IR Camera it shall be possible to start an exposure sequence within 5s of the completion of the previous exposure sequence assuming no reconfiguration is required 4 15 4 3 Multiple Integrations per IR Exposure Using the IR Camera it shall be possible to execute and process prior to data storage multiple integrations per exposure during an exposure it shall be possible to perform individual integrations at the rate of one every 10s 4 15 4 4 Rapid Sequence of IR Integrations 1 Using the IR Camera and looking at the same point on the sky through the same filter it shall be possible to execute a predefined sequence of integrations such that the delay between completing one integration within the sequence and starting the next shall be lt 1 5s 2 It shall be possible to perform data acquisition and save to disk the individual integrations within a sequence at a rate of one frame every 10s raw data or 20s coadded or NDR data The resulting data cube is for diagnostic purposes e g
57. ce handling equipment and documentation M2 The M2 Sub System comprises M2 Mirror M2 Support M2 Unit test equipment service equipment in service handling equipment and documentation IR Camera The IR Camera Sub System comprises Cryostat Cryogenic and Vacuum systems corrector optics filters filter mechanism baffles 16 off 2k x 2k IR Detectors detector controllers Guiding and wavefront sensing systems control hardware and software test equipment service equipment handling equipment and documentation Enclosure The Enclosure Sub System comprises The Dome Enclosure rotating part Basement and Auxiliary Building the adjoining building to the Enclosure that houses plant and support services for both the Telescope and the Enclosure dedicated maintenance and in service handling equipment and documentation Coating Plant The Coating Plant Sub System Comprises The Coating Plant Wash Facility test equipment service equipment documentation and spares suitable for coating the VISTA 1 and M2 in either Aluminium or Protected Silver The Coating Plant facility is housed in the Auxiliary building Data Handling Comprising hardware and software for data storage and making the data available to the quality control pipeline for which VDFS provides modules and associated documentation Doc Number VIS SPE ATC 00000 0008 Date 9 February 2006 Issue 1 0 Page 18 of 97 rc ect Author
58. d solution 3 Analyses used for verification of optical performances example M2 mirror shall have a sufficient number of points on the optical surfaces 8 1 1 1 Modal analysis 1 Modal analysis shall be performed in order to obtain accurate information concerning the eigenfrequencies and the eigenmodes of the various subsystems as required 2 The number of degrees of freedom shall be such as to have a good representation of the frequency range required Boundary conditions shall be correctly represented 8 1 1 2 Gravity load analysis The effect of gravity shall be taken into account by means of FE analysis 8 1 1 3 Wind stress analysis 1 The effect of the wind to be expected during operational conditions or survival conditions shall be verified by means of a finite element analysis 2 The wind load application method shall follow the methods of applicable document 52 8 1 1 4 Seismic analysis 1 The seismic analyses shall be based on the modal response spectrum technique The design response spectra for OBE and MLE are given in AD04 The applicable percentage of critical damping to be used 15 e 1 for OBE for the telescope and its subsystems Page 31 of AD04 1 for MLE for the telescope and its subsystems Page 25 of 04 Doc Number VIS SPE ATC 00000 0008 Date 9 February 2006 Issue 1 0 Page 87 of 97 Pr ject tice Author Andrew Born e 3 for OBE for the building
59. de a safe environment for the telescope protecting it from extreme weather conditions 2 The Enclosure shall maintain a stable operating environment through thermal control stray light control and wind attenuation 3 The Enclosure shall provide all infrastructure for the Telescope In achieving these functions the Enclosure shall not be detrimental to Telescope operation i e no function of the Enclosure shall degrade Telescope performance 5 6 2 Definitions The Enclosure shall comprise the sub systems shown in Figure 8 namely The Dome consisting of the rotating portion of the Enclosure providing access to and environmental protection of the Telescope The Basement consists of the static portion of the enclosure providing foundations and support for the Dome and access to maintenance systems below the level of the Telescope azimuth floor HVAC system Heating Ventilation and Air Conditioning of the Dome and Basement and Auxiliary Building Enclosure Control System Power supply infrastructure 5 6 3 Aesthetics Deleted as descriptive unverifiable 5 6 4 General Requirements Applicable to the Enclosure 5 6 4 1 Environmental Conditions The Enclosure shall comply with all environmental conditions specified in AD04 VIS SPE ATC 00000 0008 ren LX Doc Number Date 9 February 2006 Issue 1 0 gt Page 64 of 97 Pre ject Author Andrew Born 5 6 4 2 Floor Loading Th
60. e calibration Detector and controller gain shall vary by lt 2 peak to valley across the full range of operating temperatures Electrical Crosstalk between any pair of pixels separated by 10 pixels shall be no greater than 5 x10 5 3 6 1 IR Detector The following IR Detector specifications form the baseline for VISTA 1 11 12 14 Wavelengths of Operation The required wavelengths of operation shall be 1 0 to 2 50 microns Quantum Efficiency The QE of the best 90 of pixels shall be J gt 38 H gt 47 gt 47 Format The IR detectors shall have an array of 2048 x 2048 active pixels Pixel Size Pixel size shall be between 15 5 and 20 5 microns Read Noise Detector and controller read noise shall be lt 32 electrons for a double correlated sample Read out Time The maximum acceptable read time shall be 1 second at maximum well depths Defects The number of bad pixels shall be less than 4 in the central 1952x1952 pixel area Dark Current The detector dark current shall be lt 8 e s per pixel Remnant Image Artefacts The decay time constant t shall be lt 60s Maximum dT dt Detectors shall be capable of surviving a temperature gradient of 8 degrees per hour Image smearing Charge diffusion from a pixel to its neighbouring pixels shall not exceed 10 totalled over the 8 neighbouring pixels On chip Glow The on chip glow shall be less than 8 e s per pixel everywhere 13
61. e external environment and from the lower basement area by use of adequate insulation and seals Air conditioning the inner volumes above the azimuth floor during the day and below the azimuth floor level during observing Cooled air shall be distributed throughout the entire volume by means of air outlets distributed along the inner surface including the upper part of the dome when the dome is locked in its parking position When the dome is first opened in the evening the surface temperatures above the azimuth floor level shall be within 2 C of To 5 6 7 2 Auxiliary Building 1 2 The heat or residual heat produced from the various machines pumps transformer UPS air compressor etc shall be removed from the Auxiliary Building The heat shall be exhausted to an outlet point away from and downwind prevailing of the Enclosure area 5 6 7 3 Cooling l A number of heat dissipating systems are located inside the Enclosure and also on board the telescope structure itself the heat produced by these systems shall be removed by means of a cooling system based on a liquid coolant The cooling system shall have a primary cooling circuit to provide coolant for all facilities located on the VISTA site 5 6 7 4 Ventilation Doors 2 6 In the Dome at least three ventilation openings shall be provided These openings shall be equally sized and spaced with respect to the dome slit around the circumference of the Dome T
62. e nominal floor loading shall be 1 Rail load 120kN wheel 2 General loading 10kN m 3 Localised loading 100kN m Enclosure I Basement HVAC Control Power is Civil Works Thermal LCU Power Structure Control Conditioning Dome Rotation inastcture ventilation Switching Observing Mirror Doors Handling Instrument Support i LEMP Upper Shutter oc Distribution Flat Field Dome Crane Figure 8 Enclosure Sub Systems 5 6 4 3 Emergency Lighting Lighting shall be provided to allow safe egress from all parts of the Enclosure and Auxiliary Building It shall be installed to comply with applicable safety legislative requirements Night observing conditions shall be taken into account 5 6 4 4 Protection against Fire A Fire Alarm system shall be provided to ensure the safety of personnel and equipment and shall be connected to the Control Building Sufficient fire fighting equipment shall be fitted to the building in accordance with the regulations in force Doc Number VIS SPE ATC 00000 0008 Date 9 February 2006 Issue 1 0 Page 65 of 97 rc Author Andrew Born Deleted as descriptive Figure 9 VISTA Enclosure For Information Only Deleted as descriptive Figure 10 Cross section of Basement and Auxiliary Building nominal for infor
63. ecific hardware and complies with any constraints imposed by ESO SRD 7 7 1 7 1 5 It shall be possible to export data from VISTA to external computers e g via FTP ssh External computers may include computers at the Paranal site connected outside security firewalls 4 17 Thermal Control Any systems capable of introducing thermal seeing effects shall fulfil the following requirements 1 Systems above primary mirror level shall not have a surface temperature which differs more than 1 5 C 3 C from the ambient air temperature for a 2m s wind speed within the open dome and the telescope pointing to zenith This requirement shall be met with ambient air variation of 0 5 C Systems below primary mirror level shall not have a surface temperature which differs more than 1 5 C 5 C from the ambient air This assumes 1m sec wind speed within the open dome and the telescope pointing to zenith This requirement shall be met with ambient air variation of 0 5 C All concentrated heat sources generating gt 100 W shall be cooled Dispersed heat generating systems with combined heat sources of 200 W shall be actively cooled 4 17 1 1 Temperature sensors Temperature sensors shall be provided at various locations on the telescope for monitoring and calibration purposes As a minimum sensors shall be provided on the telescope structure the M1 M1 Cell and the M2 Unit In addition air temperature at the M2 level and at the
64. eeseaeseesceceeseassaeceescceseeaaeeeeeeeesesssaneeeeeeees 93 10 2 1 VErifiCation DY En 93 10 2 2 Verification by Analysis eese eene teen teen eterne 93 10 2 3 Verification Dy 93 11 ANNEX A MAPPING TABLE 94 11 1 1 REQUIREMENTS FROM SRD SECTION 4 0 02 2200000 0 010000000000000 94 11 2 REQUIREMENTS MAPPING FROM SRD SECTION 5 7 sese eet nnne enne 95 12 CONSISTENCY amp TRACEABILITY eese eene teens tn tnn tota tn stas ten 97 VISTA Project Office Doc Number VIS SPE ATC 00000 0008 Date 9 February 2006 Issue 1 0 Page 8 of 97 Author Andrew Born Acronyms and Abbreviations ADC ALARP Altitude Angle BOB Canbus COSHH CCB CCD CCS CWL DRP DVD EED EMU ESO FIERA FITS FMEA FIO FWHM HVAC HW ICD IRACE IWS LCU LEMP LTO LRU 1 2 MLE MTBF MTTR OBE OCDD Atmospheric Dispersion Corrector As Low As Reasonably Possible Angle above horizon Broker for Observation Blocks Controller Area Network Bus Control of Substances Hazardous to Health Change Control Board Charge Coupled Device Central Control Software Central Wavelength Design Reference Program Digital Versatile Disc Encircled Energy Diameter Electromechanical Unit European Southern Observatory Fast Imager Electronic Readout Assembly Flexible Image Transfer
65. equired 5 8 8 Cooling 1 The vacuum system magnetrons shall be water cooled 2 Ifnecessary masks and shutters shall be water cooled 3 The cooling system shall be closed circuit with a heat exchanger in a stand alone unit 5 8 9 Process Gas 1 Provision for injection of the process gas shall be provided 2 Automatic control of the gas flow rate shall be enabled 5 8 10 Lighting Fluorescent lighting shall be provided for general illumination in this area Level of illumination to be 100 lux A higher level of illumination shall be provided for the mirror coating process This level of illumination shall be 500 lux and shall be achieved by use of metal halide or similar luminaires 5 8 11 Coating Plant Control 1 A system shall be implemented that shall control the coating processes from start up to shut down 2 This process shall be automated but shall require operator supervision throughout the process 5 9 Service and Handling Equipment 5 9 1 General The following guidelines have been adopted in provision of service and handing equipment 1 The dome crane shall be the prime lifting facility within the Enclosure 2 Any equipment necessary for safe service and handling shall be provided 3 Any special tools necessary for maintenance shall be provided 4 Sufficient basic tools shall be provided for maintenance of VISTA and servicing of the sub systems 5 9 2 Lifting Equipment The dome crane shall be utilised
66. fied in the CANopen Specifications AD15 5 6 8 3 Manual Control It shall be possible to operate the various functions of the Enclosure through a manual control panel s 5 6 0 Telescope Pier 5 6 9 1 Definition 1 The Telescope Pier consists of the static portion of the VISTA telescope providing foundations and support for the telescope 2 In the volume within the pier there shall be access areas for equipment required for Telescope operation 3 The top face of the pier shall incorporate the Telescope anchoring system 5 6 9 2 Stiffness The Pier shall be designed in such a manner that it shall not degrade the telescope fundamental natural frequencies by more than 1 5 Hz 5 6 9 3 Vibration 1 The Telescope pier shall be vibration de coupled from the Enclosure 2 Foundations shall be cast separately with a gap between the pier and enclosure floor rafts 3 No equipment shall connect between the Telescope Pier and the Enclosure base in such a manner that vibration can be transmitted through the coupling 5 6 9 4 Access The centre of the pier shall be accessible from the basement at ground level Provision for access to equipment inside the pier e g Telescope cable wrap shall be provided Doc Number VIS SPE ATC 00000 0008 Date 9 February 2006 Issue 1 0 Page 72 of 97 Pr ject mr DfA fice Author Andrew Born 5 7 Auxiliary Equipment 5 7 Definition Auxiliary equipment is defi
67. for taking the primary mirror from the Telescope to the basement The Azimuth floor shall be covered during normal operation of the telescope with covers meeting the basic floor loading requirements of Section 5 6 4 2 Two parallel rails shall be installed between the coating area and the stripping area These shall be recessed into the floor and covered by steel floor plating when not in use Safety cabinets shall be provided for storage of stripping and washing materials when not in use 5 6 6 7 Camera Storage and Support l 2 3 Facilities to store one camera shall be provided in the basement These shall include all necessary support to operate the camera remotely from the telescope It shall be possible to perform minor maintenance activities in this area For larger engineering tasks the mirror stripping area shall be utilised deleted as irrelevant to deliverables 5 6 7 HVAC System 5 6 7 1 Enclosure Temperature Stabilisation In order to provide the optimum observing conditions the environmental systems shall ensure that all internal surfaces of the enclosure have at the start of the night a temperature close to the predicted midnight air temperature for that night Doc Number VIS SPE ATC 00000 0008 Date 9 February 2006 Issue 1 0 Page 70 of 97 Pr ject mr tice Author Andrew Born Thermal control shall be achieved by 2 Minimising the heat input both from th
68. ge drift whilst not auto guiding 1 Open loop tracking shall be accurate to within 0 2 arcsec rms over 15 seconds 2 Open loop tracking shall be accurate to within 0 5 arcsec rms over 5 minutes 3 It shall be possible to track open loop objects moving at non sidereal rates of up to 1 arcsec s The size of the zenith blind spot may be increased by 25 radius for non sidereal tracking at the maximum rate and proportionally for lesser rates 4 14 2 Closed Loop Tracking 1 Closed loop tracking shall be performed whilst auto guiding closed loop tracking performance is not defined explicitly since it is one of the contributors to the SIQ Section 4 9 2 The autoguider shall be operational within 1 second of acquisition unless a further offset on the guide detector is required If a further offset is necessary the autoguider shall be operational within 5 seconds 4 14 3 Non Sidereal Tracking 1 The design of the VISTA system shall not preclude the later development of closed loop non sidereal tracking at rates of up to 2 arcsec min 4 15 Exposure Requirements 4 15 1 Exposure Length It shall be possible to make exposures of any duration specified between at least 1 5 s and 1 hour 4 15 2 Exposure Accuracy 1 The duration of exposures shall be within 0 1s or 1 of that requested whichever is the larger 2 The duration of the exposure at any point in the field shall be recorded to an accuracy of 0 01s or 0 25 whichever is the l
69. he combined open aperture free area shall be not less than 100m For safety reasons the door opening closing mechanisms shall be designed for operation in wind speeds up to 36m s A system of fixed louvres for the control of stray light shall be installed Each opening s door s shall be motor driven and equipped with position status feedback 5 6 8 X Enclosure Control System 5 6 8 1 Command Interface The Enclosure shall be controlled by a Enclosure Control System ECS interfaced to the Telescope Control System TCS via a Local Area Network see 5 4 The ECS shall consist of a Local Control Unit LCU a VME VxWorks based computer with software and a network of control units PLC s as well as all sensors and actuators required to control and supervise the Enclosure hardware 5 6 8 2 Hardware Interface The ECS PLCS shall comprise a hierarchical network of controllers linked to VIS SPE ATC 00000 0008 Doc Number i Date 9 February 2006 Issue 1 0 Em Page 71 of 97 re ject Author Andrew Born e the various sensors that detect the Enclosure status such as encoders contact and end switches flow and temperature sensors etc e all electrical drives valves etc which drive the motion mechanisms and the thermal control systems The Control hardware shall comply with the requirements of the Electronic Design Specification AD12 CANbus devices may also be used as speci
70. he control hierarchy of the principal VISTA software systems v On Line Archive The overall structure of the VISTA Control System is illustrated in Figure 3 This includes modules specific to VISTA modules reused from the VLT and in the case of the QC quality control Pipeline a module provided by the separate VDFS project The Telescope Software is further illustrated in Figure 4 Doc Number VIS SPE ATC 00000 0008 Date 9 February 2006 Issue 1 0 Page 56 of 97 rc ect yt tice Author Andrew Born IR Camera OS Telescope Interface Module Guide focus WFS M1 Control M2 a Altitude Control Primum Rotator Control MN Control Control M1 Support M2 5 axis Enclosure HW control HW Altitude drives Azimuth drives Rotator drives mechanisms Figure 4 The control hierarchy of the TCS and its subsystems 5 4 2 Product Tree The modules that comprise VISTA s control software are listed in Figure 5 These modules generally include the hardware required to run the software but since the logical and physical models differ there is not a one to one correspondence between software module and hardware Some hardware runs both control software described in this section and data handling software covered in Section 5 5 Doc Number VIS SPE ATC 00000 0008 Date 9 February 200
71. he field 2 The plate scale shall be within the following values 54 5 lt plate scale lt 60 um arcsec 3 The IR Camera pixel size shall be within the following values 0 30 arcsec lt pixel size lt 0 34 arcsec 4 The IR Camera shall observe a contiguous area of the sky gt 1 6 deg This shall be achieveable using six telescope pawprints for 16 detectors each of size 2048 x 2048 pixels on a 90 42 5 spacing VIS SPE ATC 00000 0008 LM Doc Number Date 9 February 2006 Issue 1 0 Page 24 of 97 p rc ject Author Andrew Born 4 9 System Image Quality 4 9 1 1 SIQ Visible Channel Requirements Deleted as descriptive 4 9 1 2 SIQ IR Channel Requirements Definition SIQ max 50 EED 80 EED 1 54 where EED excludes the free atmosphere seeing The following IR Camera 5 0 requirements shall be met for an exposure of duration up to 30 minutes in the J H and K passbands without micro stepping SIQX 0 5x fwX fanX fp arcsec where fw is the high windspeed correction factor for windspeed fam 18 the airmass correction 15 the factor allowed for optimisation of the image quality towards the centre of the field the power of 1 3 is chosen to give a smoothly varying factor 10 at 1 5 and 20 at 1 6 fp 18 the factor allowed for change in pixel scale from the original concept of 17 8um the value of 2 has been chosen to reflect the contribution of this pa
72. hnical Specification Intentionally blank EMC and Power Quality Specification Part 1 EMC and Power Quality Specification Part 2 Acceptance Procedure Electrical Safety and EMC Construction requirements of the VLT Observatory Infrastructures Buildings Enclosures related to EMC VLT Electronic Design Specification Deleted duplicate of AD10 VLT Requirements for Safety Analyses VLT CANopen Specifications Documents AD15 to AD19 intentionally blank VLT Programming Standards LCU Common Software User Manual VLT Instrumentation Software Specification Document Number and Issue VIS SPE VSC 00000 0001 issue 2 VIS PLA ATC 00000 0007 issue 1 0 Document Number and Issue VLT SPE ESO 10000 0016 issue 2 VLT SPE ESO 10000 0004 issue 6 VLT SPE ESO 10000 1853 issue 1 VLT SPE ES0 10000 0013 issue 4 VLT SPE ESO 10000 0002 issue 2 VLT SPE ESO 10000 0003 issue 1 VLT VER ESO 10000 0958 issue 2 VLT SPE ESO 12000 0262 issue 1 VLT SPE ESO 10000 0015 issue 5 VLT TRE ESO 00000 0467 issue 1 VLT SPE ESO 10000 2772 issue 1 VLT PRO ESO 10000 0228 issue 1 VLT MAN SBI 17210 0001 issue 3 7 VLT SPE ESO 17212 0001 issue 3 Project Office AD23 AD24 AD25 AD26 AD27 AD28 Note 2 1 3 VLT Instrument Common Software Specification Data Interface Control Document Telescope Control System User Manual Broker for Observation Blocks User Manual Central Control Software User Manual Final Layout of VLT Control
73. hotometric Error Budget Overheads in 4 8 3 but with 6 not 4 pawprints 6 6 6 n a vis only 7 7 4 12 3 1 6 3 4 Goal 4 8 3 6 3 5 Goal specified not a tech spec ae 7 1 3 Goal specified 7 6 1 7 and Data Dictionary 2 8 3 1 3 2 1 1 1 2 1 4 Significantly 1s taken as 3096 1096 variation Size of Raytheon detectors forced 4 gt 6 16 detectors are provided relies on input from ESO Weather site ESO do not put such information in FITS headers Doc Number VIS SPE ATC 00000 0008 Date 9 February 2006 Issue 1 0 Page 96 of 97 Author Andrew Born 7 3 2 6 1 3 6 1 4 2 741 Not specified 7 5 1 5 5 7 5 2 5 5 4 5 6 1 3 pees 5 5 5 5 5 4 5 mom 7 not specified 7 4 16 7 not specified 7 6 2 Goal not specified 3 4 5 6 6 1 4 16 5 but for 10 not 30 nights 7 1 8 1 VDFS responsibility ESO say not necessary VDFS VDFS VDFS VDFS No electronic data transmission from Paranal Survey Progress Database by VDFS ESO does not intend to normally offer VISTA in visitor mode Data will go from Paranal on disk by courier to Garching then a copy on to UK UK side only A Project Office Doc Number VIS SPE ATC 00000 0008 Date 9 February 2006 Issue 1 0 Page 97 of 97 Author Andrew Born 12 Consistency amp T
74. insscosdeesseetdenssussdivdsuess sett ep 88 8 3 PAINTING SURFACE TREATMENT s0csecsisesscotsenssersiundscetisussstubestgestssconapsssvevouedsatsentonsisactaensuensitnessts 88 uU M D 68 8 3 2 irea ments et rp bi bre eo eram E EE EEE E OREN LP bre 68 8 4 ELECTROMAGNETIC COMPATIBILITY 89 D PEEMEC OIL D M 89 6 4 2 Electromagnetic environment eese eee ene nnne trennen nr en eren 89 89 8 5 NAMEPLATES AND PRODUCT 90 8 6 WORKMANSHIP EAEE EREEREER NEP EAN 91 TECHNICAL DOCUMENTATION scssssssssssccessscesessscssnssscsssrsesscsscssensesesssssesnssssssssensesssessensasessassssessssssesssensesees 92 Doc Number VIS SPE ATC 00000 0008 Date 9 February 2006 Issue 1 0 Page 7 of 97 Pre Office Author Andrew Born 10 VERIFICATION AND QUALITY ASSURANCE eesesssesccescsesesscescceseesoescescoeseesoesceesessseseceseeesesscesecesessossecesesssesese 93 10 1 VISTA TEST PHILOSOPHY ccccessscccececsesssseseeececsessaecesececceseunseeecccsessasaeseesecesesuaeeeceeseceseanaeeeeeees 93 10 2 PERFORMANCE VERIFICATION scsessssscececeesesesecececsessaaesesecec
75. irements of Section 4 14 are met throughout the operational range as defined in Section 5 1 10 8 3 The implementation of the cable wrap shall ensure that the cables are not damaged throughout the possible range of travel of the telescope as defined in Section 5 1 10 8 4 The cable wrap shall have capacity for permanent installation of all services for the telescope Cassegrain rotator and IR camera 5 The cable wrap shall be populated with services for the telescope Cassegrain rotator and IR camera 5 1 9 3 Telescope Fork and Base 1 The telescope forks and base shall comprise all systems between the azimuth drive systems and the altitude drive system no text no text deleted as non specific The forks and base shall allow access to bearings encoders and all components of the drives A continuous azimuth floor meeting the interface requirements defined in AD38 telescope enclosure ICD and the floor loading defined in Section 5 6 4 shall be mounted from the base structure 7 The azimuth floor shall include necessary provision for handling equipment 8 The azimuth floor shall provide a safe working surface for inspection and maintenance access to components on the mirror cell and instrument mount and camera UR S PS 5 1 9 4 Altitude Bearings and Drive System 1 The altitude axis shall use two bearing sets one at either side of the fork 2 The altitude bearings shall support the telescope tube imposed load conditio
76. kground 2 For the IR Camera the contribution to detector background from locally scattered light in any filter shall not exceed 5 of the natural sky background at any angle gt 25 from the Full Moon 3 For the IR Camera the contribution to detector background from locally scattered light in any of the J H and K filters shall not exceed 50 of the natural sky value at angles 15 25 from the Full Moon 4 12 4 Emissivity 1 To achieve a comparable performance to a cold stop IR camera the total background telescope sky of the system at K band shall not be more than a factor of 1 3 higher than a perfectly baffled system 2 The effective emissivity of the system telescope IR camera in the K band with a clean untarnished Ag coated M1 and M2 and a clean camera window and M2 baffle shall be lt 12 4 42 5 Ghosting Ghosting is defined as image artefacts caused by multiple reflections of objects in the field of view the ghosting characteristics of the system shall be 1 Ghosting with two or more unwanted reflections shall not generate any images with diameter lt 75 arcsec 2 From an 6 magnitude star at any point in the field the proportion of detector pixels in the focal plane that receive ghost flux exceeding 50 of the dark sky background shall be lt 0 1 4 12 6 Light Leakage The camera shall be designed such that light leakage being any light bypassing the science filters from any s
77. l 2 Self test This shall execute on switch on and at other times It shall carry out operations such as Checking memory access and communication links Checking the presence of necessary hardware on the LCU bus Exercising any other functions that would be safe to carry out automatically without human intervention i e NOT including any functions that would switch on or move a device that could pose a safety hazard 3 Diagnostic test This shall execute additional checks on an individual device or sub assembly which shall test all its functions This test shall ONLY be initiated by the operator or by an engineer and it is assumed that the operator shall be familiar with the test and any safety implications e g stay clear of the Telescope while testing the azimuth drive 7 3 4 Spares VPO will provide the necessary spare parts including the life spares specially produced spares at time of manufacture and the common user spares sufficient for commissioning and the first six months of operation The ranging and scaling of these spares shall be defined during the design and manufacture phase This shall be based on standard operating conditions and notified to ESO VIS SPE ATC 00000 0008 Doc Number i Date 9 February 2006 Issue 1 0 gt Page 82 of 97 Pre ject Author Andrew Born 7 3 5 Specific Maintainability Requirements 7 3 5 1 In Situ Cleaning The design of
78. marking 1 Asa general rule the main parts of VISTA subsystems and all exchangeable units LRUs shall be tagged with nameplates 2 The nameplates shall be visible after installation of the parts or LRUs The nameplate shall contain the following information e Part Unit name e Drawing number including revision e Manufacturing month and year e Name of manufacturer Deviations from the above shall be subject to VPO agreement VIS SPE ATC 00000 0008 9 February 2006 1 0 ren LN Doc Number li Date Issue ER Page 91 of 97 Project Office Author Andrew Born 8 6 Workmanship 1 and manufacturing of VISTA manufacturing shall be used standards subject to agreement between VPO and ESO These requirements herein shall apply to all entities involved in the design development Only methods and procedures which are state of the art or as a minimum best practice in precision mechanics optics electric and electronics hydraulics design development and Quality assurance activities shall follow the guidelines of 1509001 2000 or similar Doc Number VIS SPE ATC 00000 0008 Date 9 February 2006 Issue 1 0 gt Page 92 of 97 Pre ject Author Andrew Born 9 Technical Documentation The technical documentation related to VISTA shall meet the following general requirements 1 The language used shall be English
79. mation only VIS SPE ATC 00000 0008 Doc Number Date 9 February 2006 Issue 1 0 Page 66 of 97 Pr ject mr DfA fice Author Andrew Born 5 6 4 5 Enclosure Video and Audio Monitoring Video and audio signals shall be transmitted to the Paranal Control Room 5 6 5 Dome 5 6 5 1 General Requirements 1 The Dome shall have an observing aperture or slit allowing unvignetted observations throughout the observational range 2 The observing slit shall be closed by doors or shutters 3 The Dome shall have the same rotation axis as the telescope azimuth axis 4 The Dome shall be able to rotate independently of the telescope without any physical interference at any position of the telescope under operational conditions 5 The Dome shall have a floor at the same level as the fixed azimuth floor and the telescope azimuth platform The observing slit shall be equipped with a moveable windscreen The Dome shall have ventilation apertures above the azimuth floor level The Dome shall include a roof gantry crane in order to perform handling tasks Ladders and access platforms shall be supplied for the maintenance of all mechanisms 0 Any radio Frequency RF remote control shall not contribute noise to the output of the IR and or visible detectors in the camera LO Uoc 5 6 5 2 Cladding 1 The exterior walls the roof and exterior doors of the dome shall be clad with thermally insulating panel
80. mm 0 05 mm Lateral 1 0 mm 0 02 mm Doc Number VIS SPE ATC 00000 0008 Date 9 February 2006 Issue 1 0 Page 44 of 97 Pr ject tice Author Andrew Born 5 1 11 3 Cell Stability Requirements w r t The effect of the stability of the M1 Cell shall be consistent with achieving the pointing and tracking accuracy as per sections 4 13 and 4 14 and the overall SIQ performance as per section 4 9 1 2 5 1 11 4 Axial Support Requirements There shall be 84 axial supports disposed in four rings with symmetry of 120 degrees of which 81 are active and three are position definers Each active support shall incorporate a load cell and the force generated shall be controlled in an individual closed loop using Bellofram type membranes as on Gemini UKIRT The axial definer supports shall be equipped with force limiting devices to prevent over stressing the mirror in case of system malfunction Each axial definer shall incorporate a load cell The required value of force in each definer shall be controlled in closed loop to ensure that the gravity and external axial loads are equally applied to all 84 supports External moment loads shall be resisted by generation of additional support forces These shall be proportional to the pitch circle radius of the support and the sine of its angular position with respect to the moment The effect of the M1 Axial Support system shall be consisten
81. n 4 Note Requirements relating to the Visible Camera only are designated n a vis only and are not referenced in this table SRD AD01 VTS Section 4 1 1 11 4 2 1 4 3 5 3 2 ep 5 3 3 1 4 3 1 4 4 12 6 4 3 1 5 Goal n a 4 3 1 6 Goal 4 3 2 1 n a Comment Can be performed with monochromator supplied Compliant design does not preclude Compliant design does not preclude Partially compliant ilter holder design SRD ADO1 VTS Section 4 4 1 5 n a vis only 4 4 2 1 4 9 1 2 but with 0 51 vice 0 5 for 4 10 and astrometric error budget 4 10 and astrometric error budget 4 5 1 4 Goal 4 10 and astrometric error budget 4 5 2 1 4 13 1 2 4 5 2 2 Goal 4 13 1 2 but 3 rather Comment Raytheon pixel size raised base by 2 and fall off occurs in outer 0 1 radius Not achievable Raytheon pixel size raised pixel size Not a tech spec VISTA Project Office 98 SRD AD01 VTS Section 4 3 2 2 4 3 2 3 Goal n a vis only 4 3 2 4 n a vis only n a vis only 4 3 2 5 5 3 3 1 4 3 2 6 5 3 2 4 3 2 7 7 3 5 4 4 3 2 8 n a 4 3 2 9 5 3 3 3 3 432 10 a 533 1 Goal 4 3 2 11 n a 4 3 3 1 1 3 5 3 4 3 3 2 7 3 5 4 4 3 3 3 7 3 5 3 7 3 5 3 4 4 1 1 n a vis only 4 4 1 2 n a vis only 4 4 1 3 a n a vis only 4 4 1 3 b n a vis only 4 4 1 3 c n a vis only 4 4 1 3 d n a vis only 4 4 1 3e Goal vis only
82. nclosure which will also contain any X terminals required for engineering work All workstations shall be located in the Cerro Paranal Control Building unless they are dedicated data processing devices number crunchers associated with particular systems It is assumed that VISTA shall share a console an open plan work area in the VLT Control Room with the VST This console shall accommodate all keyboards screens and where appropriate CPUs and storage necessary for the Telescope Operator to control VISTA and its camera Within the Control Building some VISTA equipment may also reside in other computer rooms A local control workstation shall be situated in the office in the Enclosure Basement 5 4 3 5 Local Area Networking l VISTA s computing equipment both in the Telescope Enclosure and the Control Building shall be interconnected using media and equipment that complies with ESO standards AD28 These standards require that fibre optics are used to connect equipment except in special circumstances where copper may be used Communications shall utilise 10 Ethernet Gigabit Ethernet or ATM as agreed with ESO 5 4 3 6 Software Infrastructure All software shall use ESO s infrastructure Common Control Software AD27 and LCU Common Software AD21 and shall not duplicate functionality contained in these systems 5 4 3 7 Telescope Control System 1 2 Deleted as descriptive The VISTA TCS and it
83. nd the Axis Control System shall be defined at the level of hardware signals delivered by VME interfaces in the LCU 5 1 10 4 Control Algorithms The control algorithms shall be as implemented and documented in ESO software release 5 1 10 5 Position measurement The measurement accuracy of the position measurement systems shall be sufficient for the system to meet the pointing accuracy as per section 4 13 1 2 and shall be consistent with achieving the overall SIQ performance as per section 4 9 1 2 5 1 10 6 Velocity Measurement Deleted as no longer relevant 5 1 10 7 Motors 1 no text 2 The system shall have sufficient margin between its rated output torque and the computed maximum torque for operational and survival loads 3 The effect of the motor system on pointing and tracking shall be consistent with achieving the poointing accuracy as per section 4 13 amp 4 13 and the overall SIQ performance as per section 4 9 1 2 5 1 10 8 Telescope Angular Range The angular ranges are defined in accordance with the system of co ordinates and the origin as per ADO3 Basic Telescope Definitions VISTA Project Office 5 1 10 8 1 Kinematic ranges Azimuth axis Azimuth zero Azimuth angular range Altitude axis limited by software limit Altitude zero Altitude angular range 5 1 10 8 2 Operational conditions Zenith Blind Spot Tracking Azimuth Azimuth range maximum Azimuth tracking velocity maximum Azimuth tr
84. ned as any ancillary equipment necessary for the operation and maintenance of the VISTA facility 5 7 2 Equipment Location Deleted as descriptive Deleted as descriptive Table 8 Equipment Location Table For Information Only 5 7 5 Mirror Stripping 5 7 3 1 Washing Facility An area within the Enclosure basement shall be designated for primary mirror stripping and cleaning 5 7 3 2 Water Supply for mirror washing 1 A supply of de ionised water shall be required for washing the mirror 2 500ltr storage tank shall be provided with plumbing feed to point of use 3 De ionised water shall be stored as required 4 Provisions for water purification shall not be provided 5 7 3 3 Mirror Washing The mirror shall be stripped and washed manually 5 7 3 4 Lighting Fluorescent lighting shall be provided for general illumination in this area the level of illumination to be 100lux A higher level of illumination shall be provided for the mirror washing process This level of illumination shall be 500 lux and shall be achieved by use of metal halide or similar luminaires 5 7 3 5 Hazardous Material 1 Hazardous substances shall be stored and subsequently disposed of safely in accordance with COSHH requirements AD62 2 Chemical and Flammable materials shall be stored in appropriate cabinets 3 Data sheets shall be kept for all substances at an appropriate designated location on site VIS SPE ATC 00000 0008
85. ns as defined in Section 8 1 3 The Altitude drive shall be designed to meet the tracking requirements of Section 4 14 4 The bearing system shall provide restraint against earthquake loads 5 1 9 5 Telescope tube 1 The allowable design space of the telescope tube shall be in accordance with AD38 2 no text VIS SPE ATC 00000 0008 Doc Number i Date 9 February 2006 Issue 1 0 gt Page 39 of 97 re Author Andrew Born 3 The design shall incorporate a ring centre section interfacing with the M1 Cell and the altitude bearings and a support truss for the M2 system 4 no text 5 The obscuration caused by M2 M2 Unit baffles and supporting vanes efc shall be consistent with meeting the SIQ and Throughput requirements of sections 4 9 1 2 and 4 12 2 respectively 6 Cables and insulated coolant tubes shall be run in channels above the spiders without further obstruction of the optical path 5 1 9 6 Telescope tube structural performance Deleted as descriptive The stability and accuracy of alignment with respect to the positioning of M1 M2 and the IR Camera shall be consistent with achieving the overall SIQ performance as per section 4 9 1 2 5 1 9 7 Altitude Axis Cable Wrap 1 no text 2 The cable wrap shall be driven by the altitude axis drive which shall be designed taking account of the induced torque loading from the wrap 3 The cable wrap shall have
86. oject Doc Number VIS SPE ATC 00000 0008 Date 9 February 2006 Issue 1 0 Page 61 of 97 Pre ject tice Author Andrew Born Data Handling Data Pipeline System Archive i s deliverable of the VISTA Handling System User Station Data Flow System a separate System project Workstation Workstation Online Workstation Storage Online Online Online Storage Storage Storage Software Figure 7 Product tree of systems associated with data handling 5 5 4 Requirements 5 5 4 1 Stored Data no text 5 5 42 Writing to Disk no text 5 5 4 3 Archiving 1 Science and Calibration data shall be stored in FITS format conforming to the specifications in the Data Interface Control Document AD24 2 The FITS headers shall when associated with other logged data contain all ancillary data necessary to characterise the data fully and to allow complete data reduction subsequently to be performed 5 5 4 4 Data Storage and Transport As per 4 16 4 and 4 16 5 Doc Number VIS SPE ATC 00000 0008 Date 9 February 2006 Issue 1 0 Page 62 of 97 Pr ject mr tice Author Andrew Born 5 5 4 5 Data Quality Control QC no text 5 5 4 6 Local Data Reduction no text 5 5 4 7 On Line Archive System Science and calibration files shall be stored to disk and catalogued using E
87. on the VLT modified in detail only if necessary 5 1 17 3 Software Hardware Interface The interface between VISTA hardware and the Rotator Control System shall be defined at the level of hardware signals delivered by VME interfaces in the LCU 5 1 17 4 Control Algorithms The control algorithms shall be as implemented and documented in ESO s software release 5 1 17 5 Slew When Tracking Open Loop It shall be possible as a specific implementation to slew the rotator while tracking the telescope open loop 5 1 17 6 Performance The Cassegrain Rotator angle is defined as zero degrees with the Telescope azimuth angle of zero South and the altitude angle 90 Zenith pointing and increasing to the east The values of the performance parameters shall be The range of Cassegrain rotation 180 to 360 Tracking velocity maximum 480 arcsec s Tracking acceleration maximum 10 arcsec s Slew velocity maximum 3 6 s Slew acceleration maximum 1 09 s The effect of Cassegrain rotator performance shall be consistent with achieving the overall pointing and tracking performance as per sections 4 13 4 14 and SIQ performance as per section 4 9 1 2 Doc Number VIS SPE ATC 00000 0008 i Date 9 February 2006 Issue 1 0 gt Page 50 of 97 re ject Author Andrew Born 5 1 17 7 Position measurement no text 5 1 17 8 Velocity Measurement no text 5 1 17 9 Mo
88. or pointing at zenith with the mirror on the polishing support system 5 1 8 Secondary Mirror Assembly 5 1 8 1 M2 Optical Design Characteristics 1 The design characteristics of M2 shall be in accordance with AD33 2 The mirror shall be polished up to the external rim except for a small chamfer to avoid chips typically 0 25mm 5 1 8 2 M2 Optical Quality Optical quality in Passive mode The optical quality in Passive Mode is defined as including all surface errors with the exception of curvature and conic constant active optics correction not in operation The optical quality is expressed in terms of the rms slope error of the mirror surface The requirement for the optical quality is The rms slope error of the wavefront after removal of the curvature error focus and of the conic constant error third order spherical aberration shall be lt 0 35 arcsec rms the effect of any surface errors shall be consistent with achieving the overall SIQ performance as per section 4 9 1 2 5 1 8 2 1 Test Set up 1 The M2 mirror shall be tested on its support system 2 The testing process shall ensure removal of the axial print through with the M2 mirror pointing at nadir i e equivalent to the Telescope zenith pointing Doc Number VIS SPE ATC 00000 0008 Date 9 February 2006 Issue 1 0 Page 37 of 97 Pr ject mr DfA fice Author Andrew Born 5 1 8 2 2 M2 High Spatial Frequency Errors 1 High s
89. or shall be provided with a flat area at the centre and a target for alignment purposes All items permanently attached to the mirror shall be compatible with high vacuum applications 5 1 9 Telescope Structure The dimensions of the telescope shall be in accordance with AD38 5 1 9 1 Azimuth Bearing and Pier Interface l The Pier interface shall comprise all hardware interfacing the pier with the Azimuth bearing and shall support the telescope axially and restrain it radially against all imposed load conditions as defined in Section 8 1 The pier interface shall be compliant with AD37 VIS SPE ATC 00000 0008 Doc Number Date 9 February 2006 Issue 1 0 Page 38 of 97 Pr tice Author Andrew Born 3 The azimuth bearing shall support the telescope axially and restrain it radially against all imposed load conditions as defined in Section 8 1 The azimuth bearing shall be designed to meet the tracking requirements of Section 4 14 Earthquake restraints shall be provided Bearing shall be sealed against moisture and dirt ingress In case of failure of the oil supply no damage shall occur to the bearing Provisions shall be made for avoiding oil contamination either to or from the bearing pe cw ON Un as 1 9 2 Azimuth Cable wrap 5 1 The cable wrap shall be mounted to the yoke below the azimuth floor 2 The implementation of the cable wrap shall ensure that the tracking requ
90. ormation contained in this document is strictly confidential and is intended for the addressee only The unauthorised use disclosure copying alteration or distribution of this document is strictly prohibited and may be unlawful EQ A Project Office Change Record Doc Number VIS SPE ATC 00000 0008 Date 9 February 2006 Issue 1 0 Page 2 of 97 Author Andrew Born Issue 1 0 Date 090206 Section s Affected Description of Change Change Request Reference Remarks First formal issue Doc Number VIS SPE ATC 00000 0008 Date 9 February 2006 Issue 1 0 Page 3 of 97 Pre Author Andrew Born Table of Contents ACRONYMS AND ABBREVIATIONS EUREN HERE el 8 1 Klee 10 1 1 GENERAD eens ee 10 1 2 REQUIREMENTS CAPTURE AND 2 1 202 220000000 0000000000000000100000 000 10 1 2 1 SRD Requirements Capture an e iae trennen tese trennen 10 1 22 Vetification Strate BY 10 1 2 3 Traceability
91. ot foreseen to be significantly different to those of the IR Camera Motor torque removed as low level detail Functional aspects of limit switch operation x ref d across low level design details removed as superfluous covered in Telescope documentation Guiding whilst defocussed functionality deleted as not quantified although not specifically precluded by design Re instated as definitive Table 1 deleted Y band performance deleted was never a deliverable Pixel size changed in accordance with design process and Change Request VIS CRE ATC 95000 0016 Defect requirement changed in line with Raytheon as built performance Physical flatness requirement reworded in line with Raytheon as built status absorbed into SIQ performance UK data handling hardware requirement deleted as per v3 of TS Enclosure ground floor rail load increased to reflect as built rail plant design Flat field lighting requirements re written as a uniformity spec illumination level in TS is too bright and doesn t reflect as built configuration Transformer power rating deleted as detail refer to Enclosure documentation for evidence of suitability Detail of Coating process deleted optimisation of coating process is still to be conducted although typically it would be 6 8 layers Paint emissivity deleted as low level detail 000000000
92. ource shall be designed out and the maximum permissible increase in background from this source shall be 0 1 4 12 7 System Noise Characteristics The power spectrum of the system noise shall be such that coadding images measured through a broad band filter shall improve the S N as time between 15 minutes and 16 hours to within 10 within any 2 month period under the similar operating conditions The similar operating conditions include factors such as mirror cleanliness change of detector controller moon proximity etc VIS SPE ATC 00000 0008 Doc Number Date 9 February 2006 Issue 1 0 Page 29 of 97 Pr ject mr tice Author Andrew Born 4 13 Target Acquisition 4 13 1 Accuracy 4 13 1 1 Definition In the context of target acquisition the pointing accuracy is defined as that achievable in open loop i e without guiding after correction for repeatable effects with an operational pointing model 4 13 1 2 Absolute Pointing Absolute pointing accuracy on the sky shall be lt 3 arcsec rms 4 13 1 3 Offset Pointing Offset pointing is that achieved by moving a certain distance from a known accurate position 1 For offsets of up to 2 on the sky in any direction the relative pointing accuracy shall be lt 2 95 confidence 2 For offsets where the guide star remains on the autoguider CCD the offset pointing accuracy shall be lt 0 5 pixel on the science array
93. part under examination This includes but it is not limited to e gravity loads under different conditions e wind operational if applicable e Differential thermal expansion functional operational e operational loads dynamic example telescope slew acceleration e all specific loading acting on the subsystem or part 2 Forany subsystem the relevant load cases shall be identified and specified 8 1 1 6 Load Combination Survival Conditions 1 As a general rule the verification of the ability of any system to survive accidental loads shall take into account one survival loadcase at the time in addition to the relevant functional operational loads acting on it As a minimum the accidental loads to be considered are e Operating Basis Earthquake e Maximum Likely Earthquake e Wind Survival e Telescope Emergency Braking against hard stops e and any specific loadcase that may arise from the particular condition of the system under study example handling Doc Number VIS SPE ATC 00000 0008 Date 9 February 2006 Issue 1 0 Page 88 of 97 Pr ject tice Author Andrew Born 8 1 2 Requirement for Safety Analyses Safety analyses shall be performed following best practice to meet the requirements within AD14 8 1 3 Control loop design and analysis 1 Dynamic simulation analysis shall be performed for all the relevant functions and control loop of VISTA The main purpose of these sim
94. patial frequency errors shall be defined as the residual wavefront errors after removal of wavefront errors using a maximum of 65 N applied to the axial supports The high spatial frequency errors are defined as rms slope error of the M2 wavefront and shall be lt 0 15 arcsec rms over the operating range 5 1 8 3 Micro Roughness The micro roughness of the polished surface shall be lt 2nm 5 1 8 4 M2 Assembly Mechanical Characteristics 1 9 9 10 11 12 The mirror blank shall be of lightweighted Zerodur or similar ultra low expansion glass or ceramic The mass of the mirror shall be lt 150 kg no text The first eigenfrequency of the M2 assembly rigidly supported at the M2 Electromechanical Unit interface shall be 240 Hz deleted as descriptive and non quantitative Thermal effects on the mirror figure have been considered in accordance with meeting the SIQ performance requirements of section 4 9 1 2 The connection between the support system and the mirror substrate shall be optimised for safety A safety backup support system shall be included in the M2 Assembly to prevent the mirror or major part of it from falling in case of failure Under normal operation the safety backup support shall not influence the mirror performance The M2 Cell shall be used for interfacing the M2 Unit and for all handling operations Features for the safe and secure handling of the mirror shall be provided The M2 Mirr
95. pecifically amended by the requirements defined herein which describes the overall environmental conditions to be expected in operation maintenance storage at the Chilean site and transportation from Europe 4 3 20 Transportation Environment The transportation environment defined under Section 4 1 of AD04 is applicable 4 3 3 Installation Operation amp Maintenance Environment The VISTA system has been defined to meet the environment defined under Section 4 2 of AD04 which is applicable except for that specified herein 4 3 3 1 Natural Temperature Operational temperature range is defined as the ambient air temperature range under which all performance requirements shall be met it is defined as Operational temperature range 0 to 15 C Functional temperature range is defined as the ambient air temperature range under which it shall be possible to operate the system although performance requirements may not be met it is defined as Functional temperature range 5 to 25 C 4 3 3 2 Natural Wind Operational wind speed VISTA shall be able to operate within its nominal performances achieving the SIQ defined in Section 4 9 for average external wind speed up to 18 m s over 15 minutes providing VIS SPE ATC 00000 0008 Doc Number Date 9 February 2006 Issue 1 0 Page 22 of 97 Pr ject mr tice Author Andrew Born when the average wind speed is larger than 12m s the Telescope sh
96. protected against corrosion 7 Choice of materials between wheel and track shall ensure that any wear occurs preferentially on the wheels m 5 6 5 5 Seals Seals shall be provided between the fixed and moveable parts of the building and shutters when closed 5 6 5 6 Windscreen An adjustable windscreen shall be provided that shall track the lower extent of the observing slit providing both ventilation and stray light control 5 6 5 7 Moon Screen 1 An adjustable screen shall be provided that will track the upper extent of the observing slit providing stray light control 2 The range of travel shall be at least 2 5m from the centre of dome rotation 3 The moon screen may be combined with the Flat field screen 5 6 5 8 Flat Field A system for carrying out flat fielding of the telescope shall be installed within the enclosure The system may be installed permanently or may be deployable by remote control This system shall consist of a flat field and a flat field light system which may in turn consist of multiple sources as required to meet the nominal illumination requirements 1 Illumination of the flat field shall be controllable from the Paranal Control Room The illumination of the flat field shall be even to within 10 over its entire area 3 The illumination shall be repeatable to lt 0 5 and shall be of a continuous spectrum e g tungsten halogen 4 The flat field shall have a minimum area corresponding to a 4
97. raceability For purposes of traceability below is a summary of changes between v3 of the VISTA Tech Spec and this document these mostly reflect changes to low level engineering design detail dictated by manufacturing considerations Note fundamental performance requirements still apply it is only the low level engineering detail that has been changed and the impact of any low level design detail change has been absorbed into the unchanged high level requirements the exception to this the minor impact on SIQ due to pixel size this is addressed via VIS CRE ATC 95000 00016 4 16 1 2 3 5 1 6 5 1 9 5 5 Table 5 5 1 11 4 5 1 11 5 5 1 14 8 5 1 16 3 5 1 17 6 5 1 16 4 5 1 17 9 5 1 17 11 5 1 18 2 1 4 Table 6 5 3 6 1 2 5 3 6 1 4 5 3 6 1 7 5 3 6 1 13 5 5 4 9 5 6 42 5 6 5 8 5 7 4 5 8 2 8 3 1 1 Readout mode deleted as not implemented by chosen detectors Mirror CTE changed to reflect as built situation Minor amendment to throughput vignetting spec off axis Reflects updated RoM of M1 axial definer settings Low level design changes to M1 Axial support parameters Low level design changes to M1 Lateral support parameters Low level design details of M2 Baffle deleted superfluous information Rotator tracking performance now absorbed into SIQ requirement No longer specify provision for Visible Camera services in practice this does not preclude the Vis Camera as its service requirements are n
98. rameter to the image quality performance These factors shall be applied as follows Factor i fam fi Parameter 2 air mass FoV diameter pee windspeed scale average FoV diameter _ windspeed gt 14 m s OES d gt 1 4degrees Equal to 1 1 airmass 1 3 FoV 1 4 1 02 Otherwise equal to 1 0 1 0 1 0 1 02 VIS SPE ATC 00000 0008 AU Doc Number i Date 9 February 2006 Issue 1 0 gt Page 25 of 97 Pre Author Andrew Born 4 10 Astrometry To achieve the Astrometric performance requirements requirements 4 10 1 shall apply 4 10 1 Stability of the IR focal plane 4 10 1 1 Co planarity 1 The pixels on all detectors shall be contained within two planes spaced by lt 50 um across the focal plane 2 The tilt relative to the focal plane of any one detector array shall remain stable within 0 0125 deg 4 10 1 2 Thermal Expansion Differential thermal expansion between the arrays in the focal plane leading to distortion of the array during operation shall be lt 4 5um 4 10 1 3 Flexure Differential flexure between arrays in the focal plane under stable temperature conditions shall be lt 3um laterally lt 30um axially 4 10 1 4 Distortion The centre of the pincushion distortion pattern shall remain stable relative to the focal plane within a circle of lt 180um radius 4 10 2 Neutral Density Filter no text 4 11 Photometry
99. re painted with matt black paint e g NEXTEL 2010C 10 Black Velvet coating from 3 M Co In the event that thermal plumes are an issue this shall be covered with low emissivity MAXORB Nickel foil or similar 8 3 2 Surface treatments Unpainted Surfaces are treated against corrosion In this case the bonding requirements specified in ADO9 shall be met Doc Number VIS SPE ATC 00000 0008 Date 9 February 2006 Issue 1 0 Page 89 of 97 Pr ject mr tice Author Andrew Born 8 4 Electromagnetic Compatibility 8 4 1 General 8 4 1 1 Intra system electromagnetic compatibility VISTA shall exhibit complete electromagnetic compatibility among the parts components devices apparatus and equipment of which it is composed intra system electromagnetic compatibility No malfunction degradation of performance or deviation from specified parameters is admitted because of lack of intra system electromagnetic compatibility 8 4 1 2 Inter system electromagnetic compatibility Minimisation of the electromagnetic interference between VISTA and its environment shall be a concern in the design and manufacture of VISTA inter system electromagnetic compatibility In order to achieve inter system electromagnetic compatibility VISTA shall comply with the EMC requirements set by the applicable documents ADOS and or ADO9 or otherwise as agreed between ESO and VPO 8 4 2 Electromagnetic environment VISTA shall be inst
100. readout anomaly etc and shall not be regarded as a science data product 3 Incorporated into 4 15 4 4 above 4 16 Data Handling 4 16 1 Stored Data 4 16 1 1 Visible no text 4 16 1 2 IR It shall be possible to store data from the IR Camera in any of the following forms all 4 bytes pixel 1 Raw data with or without differencing 2 Coadded 3 deleted as not supported by Raytheon detectors Any set of data shall be stored in one form only VIS SPE ATC 00000 0008 Doc Number i Date 9 February 2006 Issue 1 0 gt Page 32 of 97 re ject Author Andrew Born Using the IR Camera it shall be possible to perform data acquisition and store exposures at a sustained rate of one exposure per 10s over a period of 14 hours This is a requirement on data acquisition and storage alone 4 16 2 Writing to Disk 1 The system shall ensure that adequate free disk space is available to store the data when an exposure is initiated so long as the maximum data volume per night as stated in Section 4 16 1 2 is not exceeded If adequate disk space cannot be made available e g due to an equipment or operational failure the exposure shall not be initiated without specific operator intervention 2 It shall be possible to store data to disk whilst concurrently moving the telescope and reconfiguring the camera 4 16 3 Archiving All science and calibration exposures shall be stored to disk
101. ring events shall be logged including a telescope motions b camera configurations c faults 3 Logs shall be transmitted during the day following the observations 4 Logs shall properly take account of non operating detectors i e record that the relevant area of sky has not been observed N Re Doc Number VIS SPE ATC 00000 0008 IX Date 9 February 2006 Issue 1 0 ER Page 78 of 97 Pre ject Author Andrew Born 6 1 6 Handling Faults 1 Where feasible the system shall continue normally to operate in the presence of faults Such faults may include non operating detectors 2 The existence of missing or poor quality data shall be indicated in the data headers 3 All faults shall be logged Each log entry shall contain relevant details to assist an engineer to diagnose the problem 6 1 7 Weather Monitoring 1 Weather monitoring data from Paranal Observatory shall be incorporated into the science data headers 2 As a minimum this shall include seeing monitoring local temperature and wind speed data 6 4 8 Readout Noise Pickup It shall be possible to operate any single mechanism during detector readout for noise pickup testing VIS SPE ATC 00000 0008 LM Doc Number Date 9 February 2006 Issue 1 0 Page 79 of 97 rc ject Author Andrew Born 7 Reliability Maintainability amp Safety Requirements 7 1 Telescope
102. rument control LCU Detector Control System Any networking equipment necessary to allow these systems to communicate with each other Storage Data Handling 5 5 1 Definitions Data Handling described in this section includes hardware and data flow software to transfer and store data The requirements are somewhat more general than this and apply also to the functionality of other subsystems described in this document Doc Number VIS SPE ATC 00000 0008 i Date 9 February 2006 Issue 1 0 60 of 97 Pre ject Author Andrew Born 5 5 2 Block Diagram The systems that perform data handling are illustrated in Figure 6 This figure includes the IR Camera as an external although functionally many of the requirements listed below also apply to the Camera software and hardware Note that the Quality Control system software modules are deliverables from the VDFS not the VPO IR Camera Quality Control Data Handling Figure 6 Block diagram of data handling systems 5 5 3 Product Tree The product tree for data Handling is shown in Figure 7 In general all the modules include a workstation data storage and software Except for the Archive system the hardware is specific to VISTA whereas the software is generally existing VLT software configured to VISTA s requirements In the case of the QC pipeline software modules are provided by the related VDFS pr
103. s 2 The cladding shall afford water and air tightness to the enclosure 3 Bonding of the external metal sheets of the cladding for protection against lightning and lightning electromagnetic pulse LEMP in accordance with AD12 Bonding conductors shall allow effective and reliable electrical connections to the structural elements 5 6 5 3 Observing Slit Door 1 The observing slit door s shall have a minimum clear aperture to allow unvignetted observations throughout the observational range 2 The time for opening and closing shall be lt 60s 3 Open Closed status indicators shall be provided 4 The doors shall be designed for operation in wind speed up to 36 m s 5 6 5 4 Rotation System 1 The Dome Rotation performance shall exceed that of the Telescope such that it does not accrue additional overheads on the observing efficiency 2 The rotation system shall sustain all vertical and horizontal Dome loads 3 The rotation system shall allow unlimited rotation in both rotation directions VIS SPE ATC 00000 0008 Doc Number Date 9 February 2006 Issue 1 0 Page 67 of 97 Pr tice Author Andrew Born 4 The rotation system shall stop the rotation from maximum speed in less than 5 seconds in emergency situations 5 The rotation system shall allow adjustment and assembly during the on site erection of the Enclosure All rotation system mechanical parts shall be adequately
104. s 95 confidence 4 13 1 4 Re Acquisition It shall be possible to reacquire objects across the field previously observed at the same airmass to the same position in the detector focal plane as before to an accuracy of 1 pixel Re acquisition to this accuracy shall be achieved through an offset applied after initial target acquisition 4 13 2 Acquisition Time Target acquisition speed defines the maximum time to acquire a new object and start tracking open loop It includes motions of both the telescope mount and the enclosure It does not include filter change or detector read out overheads It shall be possible to acquire a target up to 60 from the previous position within 45s It shall be possible to acquire a target up to 15 from the previous position within 30s 1 2 3 It shall be possible to acquire a target up to 2 from the previous position within 10s 4 It shall be possible to acquire a target up to up to 10 arcmin from the previous position within 6s 5 It shall be possible to acquire a target up to up to 2 arcmin from the previous position within 3s 6 It shall be possible to acquire a target up to up to 20 arcsec from the previous position within 2s VIS SPE ATC 00000 0008 Doc Number Date 9 February 2006 Issue 1 0 30 of 97 Pr ject mr tice Author Andrew Born 4 14 Tracking 4 14 1 Open Loop Tracking Open loop tracking is defined as the ima
105. s pier and enclosure Page 33 of AD04 5 for MLE for the buildings pier and enclosure Page 33 of AD04 2 For the verification of specific scenarios where the equipment is in a configuration which is used only occasionally for example M1 mirror in coating plant a reduced Response Spectrum may be used MLE In particular this is covered by the curve of AD04 MLE rR Mirror Maintenance 1 q 1 0 Page 45 of AD04 3 The model used and the number of dynamic degrees of freedom shall be such that an accurate modal response is obtained up to a frequency of 35 Hz The model shall include the foundations and the interface to the ground 4 The Square Root Sum of the Square method SRSS shall be used in order to combine the contribution of the various modes The three spatial components of the response shall be combined according to the provisions of Chapter 6 of the Eurocode 8 Part 1 5 The earthquake analysis of the cameras can either be performed with the general rules above by physically including them in the model or provided that its first natural frequency is sufficiently high by the simplified method quasistatic analysis described in ADOS 8 1 1 5 Load combination Operational Condition 1 The load combinations for verification of stresses displacement and in general the performances under operational conditions shall take into account the sum of the relevant individual load cases applicable to the subsystem or
106. s subsystems shall provide the functionality as defined in AD25 excluding a Adaptive Optics b M3 c Chopping d Field stabilisation AU Doc Number VIS SPE ATC 00000 0008 i Date 9 February 2006 Issue 1 0 EQ Page 59 of 97 Project Office Author Andrew Born 3 VISTA s TCS software shall be a copy of the VLT TCS AD25 modified where necessary 5 4 3 8 Observation Control l 5 4 1 5 5 High level observation control at the Cerro Paranal site shall be performed using standard ESO VLT software configured for VISTA use This shall include software schedulers and the Broker for Observation Blocks AD26 Observation control software shall run on the Instrument Workstation or other workstation as agreed with ESO 3 9 Instrument Control The Instrument Software shall comply with the VLT Instrument Software Specification AD22 It shall include Observation Software Instrument Control Software Detector Control Software Observer Support Software Maintenance and Verification Software Interfaces shall comply with the corresponding interfaces on the VLT including a Observation Handling Software AD32 b Archive System AD24 c TCS AD25 The Observation Software shall recetve commands from the Broker for Observation Blocks 26 The instrument hardware shall be sufficient to run the software and shall include Instrument workstation Inst
107. t Zenith 5 1 7 3 2 MI Spatial Frequency Errors 1 High spatial frequency errors are the residual wavefront errors after removal of low spatial frequency wavefront errors using a maximum of 65 N active force applied to the MI axial supports 2 The high spatial frequency errors are defined as rms slope error of the wavefront and shall be lt 0 06 arcsec rms over the operating range VIS SPE ATC 00000 0008 Doc Number Date 9 February 2006 Issue 1 0 Page 36 of 97 Pr ject mr DfA fice Author Andrew Born 3 All M1 spatial frequency errors shall be consistent with achieving the overall SIQ performance as per section 4 9 1 2 5 1 7 4 Microroughness The micro roughness of the polished surface shall be lt 2nm 5 1 7 5 Interface to the M1 Cell 1 The axial and lateral interfaces to the M1 Cell shall be realised by means of bonded low thermal expansion pads 2 The axial interface design shall only be able to transmit push forces to the mirror back 5 1 7 6 Polishing requirements 1 The primary mirror shall be polished on a support system equivalent to the final support system The support system shall have the same geometry and interfaces as in the final support system of the M1 Cell in order to have the same print through as in the telescope 2 deleted as descriptive and as covered by 5 1 7 3 2 3 3 The verification of the Optical Performance Requirements shall be performed with the M1 mirr
108. t with achieving the pointing and tracking accuracy as per sections 4 13 4 14 and the overall SIQ performance as per section 4 9 1 2 Performances Force Range 5 to 900 N Absolute accuracy 2 0 N Load cell resolution 0 5 N Limiting force of axial definers lt 1700 N Minimum stiffness of axial definers 30 10 N m 5 1 11 5 Lateral Supports Requirements There shall be 24 lateral supports arranged on the periphery of the mirror The position of the supports shall be optimised to minimise the surface errors generated by the lateral support loads The design incorporates a rolling diaphragm sealed pneumatic cylinder Tangential links lateral definers shall provide the lateral component of kinematic location The lateral definers shall incorporate load cells The measured forces shall be used to control the lateral supports in a closed loop to balance gravity and external lateral loads The effect of the 1 Lateral Support system shall be consistent with achieving the pointing and tracking accuracy as per sections 4 13 4 14 and the overall SIQ performance as per section 4 9 1 2 The supports shall provision for disconnection for mirror removal and repeatable assembly VIS SPE ATC 00000 0008 Doc Number Date 9 February 2006 Issue 1 0 Page 45 of 97 Pr tice Author Andrew Born Lateral supports Performance Force range push or pull 10 to 2700 N Absolute accuracy
109. tage electrical installations of the Cerro Paranal Observatory are designed and erected according to AD56 IEC 60364 Electrical Installation of Buildings their system earthing is TN S VIS SPE ATC 00000 0008 Doc Number Date 9 February 2006 Issue 1 0 Page 84 of 97 Pr ject mr DfA fice Author Andrew Born 7 4 4 2 Safety compliance In order to achieve protection against electric shocks and other hazards VISTA and is components shall be designed and erected in compliance with the applicable documents AD54 EN 60204 1 AD55 IEC 61140 and AD56 IEC 60364 7 4 4 3 Electrical and electronic equipment 1 Electrical and electronic equipment to be installed onto VISTA shall comply with AD55 taking into account the VLT Observatory altitude 2 Information Technology Equipment to be integrated into VISTA shall comply to AD57 IEC 60950 7 4 4 4 Bond corrosion In order to prevent bond corrosion pairing of dissimilar metals shall be avoided where possible Shall joints between dissimilar metals be essential the metals in direct contact shall exhibit the lowest possible combined electrochemical potential in any case below 0 6V and the anodic member of the pair shall be the larger in size of the two 7 4 5 Primary Mirror safety 1 Under any conditions the maximum principal tensile stress in the primary mirror shall not exceed the following values 6MPa for a duration shorter than 24 hours e 3
110. th Mechanics 5 Control SW P XR MINE 2 Control Altitude Control HW m me Hardware Drive Observation Observation M1 Control Altitude Software Software Software Control HW Aue N Inst Control Inst Control E 2 Altitude System System Control SW Guide WFS Guide WFS ae 4 Data Aux Enclosure Service amp Test Handling Equipment Equipment Shutter On line f Storage Building t Dome M1 Dummy Near line Coating N Storage Plant r Basement M2 Dummy Transport Washing 7 Enclosure M1 Media Facilities Control HW Carriage Cooling _ Enclosure M1 Handling QC Pipeline Plat Control SW Tool A VDFS deliverable Power Infrastructure Instrument Handling amp connection Maintenance Equipment Figure 1 VISTA Product Tree Project Office 34 System Context 3 4 1 VISTA Context Deleted as descriptive Doc Number VIS SPE ATC 00000 0008 Date 9 February 2006 Issue 1 0 Page 20 of 97 Author Andrew Born VIS SPE ATC 00000 0008 Doc Number Date 9 February 2006 Issue 1 0 Page 21 of 97 Pr ject mr DfA fice Author Andrew Born 4 System Requirements 4 1 Context No text 42 J VISTA System Tree No text 4 3 Environmental Conditions 4 3 1 General The equipment shall comply with the requirements defined in the VLT Environmental Specification AD04 unless s
111. the System shall allow in situ cleaning of the M1 and M2 mirrors and the camera window 7 3 5 2 Primary Mirror coating A complete re coating operation by an experienced and rehearsed team shall not delay science observations by more than 3 nights 7 3 5 3 Camera Installation Removal 1 The total time to remove and install a camera shall not exceed 8 hours and shall not demand more than three technicians 2 It shall be possible to perform all maintenance functions on either camera whilst it is off the telescope without impacting on the operation of the camera mounted on the telescope 3 Following a camera change it shall be possible to reach standard operating performance and take sufficient calibration data to calibrate out any systematic changes using not more than 2 hours of clear night time and 4 hours of additional daylight following the camera change 4 Following cool down the cameras shall be capable of meeting the Astrometry stability requirements within 48hrs for the IR Camera and 24hrs for the Visible Camera 7 3 5 4 Camera Intervention 1 It shall be possible to thermally cycle the IR camera from operating to room temperature and back again in no more than 10 days 2 It shall be possible to change any or all the IR filters in the IR filter slots within 11 days Any engineering activities are in addition to the 10 day allocation Doc Number VIS SPE ATC 00000 0008 Date 9 February 2006 Issue
112. the next exposure The altitude axis of the telescope aka elevation The VLT software makes frequent reference to altitude in this context VISTA Project Office CCS Instrument Instrument Control System LCS LCU TCS Workstation Pawprint Tile VDFS Doc Number VIS SPE ATC 00000 0008 Date 9 February 2006 Issue 1 0 Page 16 of 97 Author Andrew Born Common Control Software the ESO software infrastructure used on the VLT etc A generic term that applies to VLT and similar instruments VISTA shall initially have one instrument viz the IR Camera The module within the Instrument Software that controls an instrument s mechanisms LCU Common Software that part of the CCS which runs on an LCU Local Control Unit a computer system comprising CPU VME backplane VxWorks real time operating system and software based on the LCC Telescope Control System the collection of software modules which control the hardware associated LCU systems VISTA s TCS is closely based on the VLT Telescope Control Software An HP workstation running the HP UX operating system and software based on the CCS A workstation may or may not be used directly by a user The 16 non contiguous images of the sky produced by the VISTA IR camera with its 16 non contiguous detector chips A filled and fully sampled area of sky formed by combining multiple pawprints Because of the detector spacing the minim
113. thods of verification shall be carried out to show that the requirements of VISTA 10 2 1 Verification by Design Verification of the design shall be carried out during the design phase to ensure that the required performance can be met This shall include the use of Formal Design Reviews 10 2 2 Verification by Analysis The performance of the specific item shall be demonstrated by carrying out appropriate analysis during the design phase 10 2 3 Verification by Test The performance of the specific item shall be verified by specific tests Testing may also encompass Inspection or Demonstration as appropriate VISTA Project Office 98 Doc Number VIS SPE ATC 00000 0008 Date 9 February 2006 Issue 1 0 Page 94 of 97 Author Andrew Born 11 ANNEX A Mapping Table to SRD The following table maps the requirements listed in the Science Requirements Document ADOI to the appropriate section of the VISTA Technical Verification Specification column for comments is used to clarify points e g where an SRD requirement is not a technical specification where it is dealt with elsewhere including by VDFS or where the VTS requirement that can be achieved differs from that in ADO1 Specific goals within the SRD have been retained on a best efforts basis the VPO shall endeavor to approach these goals unless cost or schedule are compromised 11 1 A 1 Requirements from SRD Sectio
114. to be driven with a maximum out of balance load of 1000 Nm with respect to the altitude axis The auxiliary drive shall be interlocked to disable the main altitude drives when used 5 1 11 Primary Mirror Cell 5 1 11 1 Cell General Requirements uro Deleted as descriptive Deleted as descriptive Deleted as descriptive Deleted as descriptive The effect of the Cell Mirror Support etc shall be consistent with achieving the overall SIQ performance as per section 4 9 1 2 5 1 11 2 MI Mirror Support 59 991 The primary mirror shall be kinematically supported by means of a distributed axial and lateral support system conforming to the geometry defined in AD35 The supports shall apply force control The mirror position along the optical axis shall be defined by means of three axial definers By changing the force pattern applied to the mirror back by the axial supports it shall possible to modify the mirror figure The mirror position in the lateral plane shall be defined by means of three lateral definers The mirror shall be protected against earthquakes by safety devices The mirror shall be restrained at low elevation angles The mirror cell shall have provision for Telescope balancing The 1 definer system shall have the range and step size of adjustment defined in Table 5 Table 5 M1 definer range and step size of adjustment Range of Adjustment Adjustment Step Size Axial 3 0
115. tors The combined effect of ripple and cogging shall typically be less than 1 of the maximum torque and shall be consistent with achieving the pointing and tracking performance as per sections 4 13 4 14 and the overall SIQ performance as per section 4 9 1 2 5 1 17 10 Brakes Brakes shall be provided which are capable of preventing rotation when the Telescope is not in use and stopping the rotation in emergency or when hardware limit switches are actuated The brakes shall have the capacity to resist the maximum motor torque 5 1 17 11 Limit switches and end stops Operational aspects covered in section 5 1 10 8 4 left in as placeholder to preserve consistency of numbering Specific numbers deleted as inappropriate low level detail 5 1 17 12 Safety locking The Cassegrain rotator shall be capable of being locked out the locking pins shall be part of the Telescope Interlock System 5 1 18 Guiding and Wavefront Sensing Requirements 5 1 18 1 Telescope Feedback Requirements Three types of feedback shall be provided in order to achieve the functionality These are 1 guide sensing to generate tracking corrections to feed into the Telescope Control Software 2 low order wavefront sensing LOWFS to generate wavefront errors operating concurrently with science observing to feed into the Telescope Control Software 3 ahigh order wavefront sensing HOWFS for off line calibration of the M1 figure 5 1 18 2 Sensor Requirements 5 1
116. ts AD06 and AD12 covering Service Connection Points and Electronic components As general design guideline the VISTA design shall make use of standard equipment already selected by ESO for the VLT with a minimum of specialist tooling 6 Three different category of maintenance shall be considered e Predictive Maintenance e Preventive Maintenance e Overhaul 7 3 2 1 Predictive Maintenance Predictive maintenance is condition driven preventative maintenance Instead of reliance on life time statistics predictive maintenance uses direct monitoring of the system performance or condition Typical examples are testing of gearbox oil for bearing deterioration or monitoring of drive currents for change in loading characteristics The VPO shall define predictive maintenance opportunities for adoption on site and provide the interfaces necessary for such activities 7 3 2 2 Preventive Maintenance 1 Preventive maintenance actions not including periodic mirror re coating shall be planned with a frequency of e every month for inspections and relatively simple actions of less than 4 hours in total e multiple of 6 months for other actions with a maximum of 12 hours every 6 months 2 The preventive maintenance tasks shall be accomplished by two trained technicians with a minimum of special equipment or tools 7 3 2 3 Overhaul Overhaul is defined as special preventive maintenance operation during which the equipment is not operational
117. ub System 17 3 4 DYSTEM 20 3 4 1 20 4 SYSTEM REQUIREMENTS sissessssssssssesssonsseses sssssssesssonssosessassesstesosesesoessasssecssosssaassesetseoss seseessesssecsseosssassssetescsesessessees 21 4 1 CONTEXT a hates oid Sa eae 21 4 2 VISTA SYSTEM TREB E nord edic Ge des 21 43 ENVIRONMENTAL CONDITIONS enit e oe dea eim eite Gane 21 4 3 1 ea mE 21 4 3 2 Transportation Environment 21 4 3 3 Installation Operation amp Maintenance 1 eese esee eerte entente 21 4 4 EXTERNAL INTERFACES 5 soe aE r ERE ENES 22 4 4 1 POWER DIISIDUIOTN N 22 4 4 2 Local Area NelWOER 22 4 5 REFERENCE FRAME 22 4 6 TELESCOPE APERTURE cists eise eti eir eot ue is 23 4 7 WAVELENGTH COVERAGE 23 4 8 SIYICOVERAGE 23 4 8 1
118. ulations is to confirm the fulfilment of the different relevant requirements 2 As a general rule dynamic simulation shall include the effect of non linear effects like friction stick slip sensor noise etc For each of the functions to be controlled the stability margin shall be computed 8 1 4 Electromagnetic Compatibility analysis An electromagnetic compatibility EMC analysis may be used for VISTA as a method of verification of specific EMC requirements instead of tests In this case the analysis shall be performed with the procedure and goals defined in AD08 ADO9 and AD10 as appropriate Other references standards or methods may be used as an alternative subject to agreement between ESO and VPO 8 2 Material Parts and Processes 1 The selection of material shall be in accordance with the ESO preferred material list Full details on standard electro mechanical components are listed in AD12 The use of non standard components shall to the possible extent be avoided 3 A stress release treatment of the major welded parts of the VISTA telescope shall be applied The process used shall be agreed by the VPO 8 3 Painting Surface Treatment 8 3 1 Paints 1 The VISTA telescope tube structure are covered with low emissivity diffuse aluminium paint or aluminium foils 2 The surfaces around the optical beam are painted with matt black paint e g NEXTEL 2010C 10 Black Velvet coating from 3M Co 3 The telescope spiders a
119. um number of pointed observations with fixed offsets required for reasonably uniform coverage is 6 which would expose each piece of sky away from the edges of the tile to at least 2 camera pixels The VISTA Data Flow System a related project to provide to ESO an Exposure Time Calculator modules for a pipeline in Chile to assess data quality QC modules for a pipeline in Garching to remove instrumental artefacts and calibrate the data both photometrically and astrometrically a Survey Area Definition Tool Doc Number VIS SPE ATC 00000 0008 Date 9 February 2006 Issue 1 0 Page 17 of 97 Pr ject tice Author Andrew Born 3 3 Product Tree and Sub System Definition 3 3 1 Product Tree A Product Tree of the hardware and software of VISTA covered by this specification is given in Figure 1 3 3 2 Sub System Definition The sub systems comprising VISTA are defined in this section Items in italics while essential to proving the sub system performance do not form part of the final deliverables of the project Telescope The Telescope Sub System comprises the Telescope Structure M1 Cell Cassegrain Rotator Control Hardware and software Service and Test Equipment Factory Service and Test Equipment in service handling equipment and all supporting documentation 1 The M1 Sub System comprises Mirror test equipment Test Specimens and 1 Transport Container in servi
120. upplied to the VISTA or subsystems of it Emergency braking of the telescope tube OBE or MLE earthquakes Wind loads 7 4 12 Safety Interlock System Interlocks shall be implemented wherever necessary to prevent a dangerous situation or to respond to a dangerous situation Dangerous situations include hazards both to personnel and to equipment The implementation of Interlocks shall be in accordance with AD12 VIS SPE ATC 00000 0008 Doc Number Date 9 February 2006 Issue 1 0 Page 86 of 97 Pr ject mr DfA fice Author Andrew Born 8 General Requirements for Design and Construction 8 1 Requirements for analyses 8 1 1 Finite Element Structural Analyses 1 All the Finite Element Analyses necessary for the verification of the performance of the major subsystems of VISTA shall be performed with an internationally recognised numerical code The structural models used shall be adapted to the particular analysis for which they are to be used and shall be accurate enough to provide a good description of the behaviour of the structure under examination in terms of displacements stress and frequencies 2 The analysis error due to mesh density shall be lt 10 in terms of FE internal criteria such as the Percentage error in energy norm Alternatively this type of error can be evaluated by mesh refining The verification of the accuracy of the modal analysis by experimental methods is in any case the preferre
121. with adequate meta data to allow subsequent data reduction and in the format compliant with the ESO Data Interface Control Document 24 4 16 4 Transport The system shall write data to transport media provided by ESO 4 16 5 Data Storage a On line storage shall be provided for the maximum data volume generated over 2 nights b On line storage shall be provided for the typical data volume generated over 10 nights 4 16 6 Near Line Storage no text 4 16 7 Data Quality Control Note Software Modules for Quality Control QC are deliverables of the related VISTA Data Flow System project with whom necessary information will be shared to assist the work as per AD41 4 16 8 Local Data Reduction 1 The VISTA system shall allow data to be read and processed on a local workstation within 10 minutes of the data s acquisition This shall not interfere with the observing process including data acquisition pipeline data reduction and data archiving either in functionality or performance Doc Number i Date 9 February 2006 Issue 1 0 gt Page 33 of 97 VIS SPE ATC 00000 0008 Pre ject Author Andrew Born 2 Use of this local workstation shall not impact the performance of VISTA s data acquisition pipeline data reduction and data archiving processes Authorised personnel shall be able to install new application software provided it can be compiled and run on the sp

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