TNG: THE OIG USER MANUAL June 2000
Contents
1. Fig 4 5 Misalionment of OG s MOSAIC iii ertt er RIO TREE Adee GERNE anal rtt tree eate o ae Eig 4 6 FEV 4280 SITUCIUEe e reri rte EHE ei ARIA Meee eee eee 38 Pir AI U Besse A mU MESI MN dE EIE 41 Pig 4 8 B Belial 42 luna pM MI JR M 43 Fig 4 10R goi 44 Fig 42 12 Gunn cia AS Fig 4 12 1Gunh Band Fringing Ll mai ia 46 9 LIST OF TABLES Tab 2 1 List of commands to TASKI O ui vedaccopsoscedonssedeesooeonssocesnesseondest vdeee 5 Tab 2 2 Listof global variables used in TASK lO ii eiii 8 Tab 2 3 Powered SMS 0 16 Tab 3 12 Eistot CCD command s Licia EUER NER RECEN PROCERES Pre Ee 21 Tab 3 2 GATE COMMON Tasks rer rettet adicta 21 Ta3b 3 3 A acne 21 Tab 34 AOPT and Tracking tasks oie 21 Tab 3 5 DOLORES tasks nee eerte eb bie eR ER Vi ura aed vise e 22 TNG THE OIG USER MANUAL June 2000 S Benetti C Bonoli R Cosentino D Fantinel A Ghedina E Giro A Magazz Tab 3 6 Camera software working directories rie 22 Tab 4 1 Filters CharacterIstos csria nani ani 31 Tab 4 2 CCD s character sus casistica 35 Tab 4 3 D viation from Uniformity sssrini reputo ea ica aaa 35 LADA ili E n EIL EIQUE EU II eR EE 38 Lab AEB ia iia 39 Tab 4 6 EEV ii Ea 40 10 SUMMARY li UINECRODUGIION odias 2 THE2. Fig 2 1 The Nasmyth Interface mounted on The Derotator A without instruments In the centre of NIA you can find the OIG cryostat see Fig 2 2 It is mounted on the rotation axe of the NIA also containing the filter wheel system see Section 2 3 and the sliding carriage with the mirrors to direct the light to the IR camera to the AdOpt module or just to allow it passing through for the OIG Between the NIA and the cryostat there is the OIG shutter Section 2 4 Electronics racks with the OIG controller filter wheel controller and shutter controller are placed on the external side of NIA and well accessible for technical operations see Section 2 5 TNG THE OIG USER MANUAL June 2000 S Benetti C Bonoli R Cosentino D Fantinel A Ghedina E Giro A Magazz All the instrumentation and NIA itself are powered by a remote controlled line starting from the telescope derotator main cabinet power plant floor All instruments have their own multiple plug and can be remotely switched on and off independently from the others 2 2 THE OIG CRYOSTAT The OIG cryostat is a custom modification of the standard INFRARED LAB cryostat model ND 25 See Fig 2 3 The OIG cryostat The ARNICA cryostat The OIG CCD controller rack Fig 2 2 The OIG and ARNICA cryostats mounted on NIA TNG THE OIG USER MANUAL June 2000 S Benetti C Bonoli R Cosentino D Fantinel A Ghedina E Giro A Magazz
3. Fig 2 3 Internal view of the cold plate with the CCD mosaic 2 3 THE OIG FILTER WHEEL SYSTEM There are 2 wheels mounted inside the NIA to select which filter has to be used for the OIG camera Each wheel has 10 holes to provide space for 8 filters 1 Atmospheric Dispersion Corrector ADC and a clear position ADCs will be treated as filters in the following so that 18 filter positions will be available Obviously when one is using the filter of one wheel the other wheel will be on the clear or ADC position actually there is no plan to mount any ADC and thus only the first option is implemented Each filter holder has a writable readable EPROM and for each wheel there is a Baluff sensor to write read the EPROMs there are then 18 positions for the wheels each one corresponding to a pre mounted filter when using the Baluff sensor A picture of the filter wheel system can be seen in Fig 2 4 obviously the shutter can t be seen when OIG is mounted There is also a cover to protect the filters which in Fig 2 4 has been removed The whole system for one wheel except for the wheel s brake is drawn in Fig 2 5 TNG THE OIG USER MANUAL June 2000 S Benetti C Bonoli R Cosentino D Fantinel A Ghedina E Giro A Magazz Baluff Wheel Limit switches L ud i OIG shutter yr Filter Wheel I E Motor and encoder Counter torque motor Fig 2 4 The filter wheel system as seen from the outside
4. 2 5 THE OIG CCD CONTROLLER CCDC The architecture of the CCD s readout system in shown in Fig 2 9 The first block is the CCD controller which is located close to the cryostat Into the CCD controller there is a bus called CCD controller bus in which are plugged in a sequencer board and at least one analog board The sequencer board generates the clock sequences Each analog board produces 8 programmable bias voltages 16 clock drivers with independently programmable up and low levels Each board is able to read and process four channels independently This controller allows different readout modes Full frame Frame transfer Binning on chip Windows The controller is connected by optical fibers to a VME crate This one contains e ashared memory for image storing e atransputer for commands dispatching to the controller e an Ethernet connection to the TNG workstation system 11 TNG THE OIG USER MANUAL June 2000 S Benetti C Bonoli R Cosentino D Fantinel A Ghedina E Giro A Magazz 4 CCD controller BUS CCD CONTROLLER Work Station Work Station Fig 2 9 CCDs readout system A complete CCD controller system is made by three parts 1 The CCD Controller CCDC main rack 2 The camera cryostat with the detector amplifiers and bias buffers 3 The hostcomputer a PC a VME connected inside a computer net The CCDC 19 main rack is shown in Fig 2 10 f
5. June 2000 S Benetti C Bonoli R Cosentino D Fantinel A Ghedina E Giro A Magazz CCD cryostat pre amplifier with clamp correlated double sampler board CCDCDS TNG THE OIG USER MANUAL June 2000 S Benetti C Bonoli R Cosentino D Fantinel A Ghedina E Giro A Magazz Fig 2 12 VMEOIG rack 2 6 THE SYSTEM POWER SUPPLY The power distribution for the OIG camera is based on the same architecture used for all the instruments mounted at the Nasmyth A interface A schematic diagram is shown in Fig 2 13 the main power switch to the derotator systems is handled directly by the VME SERVICES TNG control room witch can switch power to the derotator A main distribution power box 15 TNG THE OIG USER MANUAL DIG OUT channels pins P 220 AC NAS B 16 c24 17 c28 OIG RACK Q1 T En Power Plant POWER i NAS A power ON OFF 24 Veo NAS B power ON OFF June 2000 S Benetti C Bonoli R Cosentino D Fantinel A Ghedina E Giro A Magazz DIG OUT RS232 a OIG PW plug t NASMYTH A INSTRUMENT I F Power Distribution AC plugs lox PI C 808 CCD CONTROLLER FILTER WHEEL CONTROLLER RS232 PORT 2 PORT 1 ATX dual port memory ATX 361 DIG IN VME SERVICES BAYTECH RS232 MUX VME OIG ELTEC La ELTEC E VII EVI GATE GATE Um Fig 2 13 OIG
6. Anyway after 2 or 3 INITFILT commands the procedure should be completed CLEAR This is the command to let the light go directly to the OIG with no filter absorption After the initialisation the filter wheels move next to this position but the command CLEAR should be sent anyway to be sure that the position is reached FILTER n Actually there are only 8 filters mounted on the 1 filter wheel It is then logical to give ton only values between and 8 Greater values correspond to a CLEAR position but with the inside of the filter holders not black anodised When the filter is in its position you can see a message like Filter 3 is There Brakes On TNG THE OIG USER MANUAL June 2000 S Benetti C Bonoli R Cosentino D Fantinel A Ghedina E Giro A Magazz Filter holder with filter Counter torque motor Baluff sensor p Fig 2 5 Schematic drawing of the filter wheel system The other wheel has the same component arrangement BALUFF n Each of the filter holders has its own Baluff EPROM When you give this command you choose to move one of the filter EPROM under the Baluff sensor in order to read what is memorised there After the movement of the filter wheel you receive a printed message like the following one This filter is Johnson U peak 368nm pkTR 84 FWHM 93nm ENBRAKE w This command can be sent without initialising the system It activates the brakes on one of t
7. 3 4 AOPT and Tracking tasks 21 Each task is stored inside a subdirectory of the working disc partition taskxx holding the source code TASKxx c and the compilation script DOTASKxx while the executable code taskxx is stored in the bin directory Working partitions for all systems are summarized in Tab 3 6 TNG THE OIG USER MANUAL S Benetti C Bonoli R Cosentino D Fantinel A Ghedina E Giro A Magazz TASKI2 LRS telemetry user super TASKI3 LRS controller commands user super TASKIS LRS boot command user super Tab 3 5 DOLORES tasks SYSTEM OIG Tracking Shack Hartmann DOLORES Tab 3 6 Camera software working directories The camera software foresees the subdirectories e ccdtables to hold the boot table directories for CCDs they are according to the chip mounted on the system the table to load is selected by the first parameter OIG and DOLORES or second parameter Tracking and Shack Hartmann of the Joadboot command according to the following scheme 1 2 3 4 5 6 it also stores the CCD controller compatibility file to check the correspondence between the selected code controller and the allowed range for the chip For more detailed information see the TNG CONTROLLER SYSTEM manual e boot to hold the OCCAM executable code for the CCD controllers they are according to destination system for technical cameras the bootable file to load is selected by
8. C Bonoli R Cosentino D Fantinel A Ghedina E Giro A Magazz Serrourier Temperature this field permits the user to define using serrourier temperature the starting point of M2 position for automatic focus sequence START start exposure sequence LOAD load a predefined exposure sequence on the window table SAVE save a defined exposure sequence RESET rewrite the default values of sequence QUIT exit and destroy sequencer window 3 4 53 Menu Functionality Here is briefly described the top menu with its hierarchy File e Load Load a binary image from disk e Save Save an image in binary format e Print Print an hardcopy of the image e Exit Exit from user interface Edit e Open Open an image in FITS format e Save Save an image in FITS format Telemetry e One Shot Instantaneous telemetry from CCD e Start Telemetry Start a loop of telemetry the refresh time is set by the user e Stop Telemetry Stop a telemetry loop e Image Telemetry Display telemetry from image binary header CCD Status Some important CCD settings Among them CCD area x pixels y pixels Box dimension and position x pixels y pixels binning and number of chip Palette a color editor utility to better display the image Help e Commands A simple command help Read Mode This command MUST BE USED VERY CAREFULLY e 2 output left CCD is read form two left outputs e 2 output right CCD is read form two right outputs e 4 output
9. CCD is read from four outputs In this setting CCD boxing is not allowed 28 TNG THE OIG USER MANUAL June 2000 S Benetti C Bonoli R Cosentino D Fantinel A Ghedina E Giro A Magazz 3 4 4 The Telemetry Interface Fig 3 5 The telemetry interface From the top menu it is possible to open the window shown in Fig 3 5 The quantities reported in this window are the same written in the binary header of each image The window is divided into four parts e Clocks there are 16 fields corresponding to the 16 levels of clocks e Bias 8 fields for the 8 bias levels e Temperatures the 5 temperature K sensors placed on CCD vessel shield cryostat wall and electronic control A sixth sensor is not connected NC e General Status in this part all the other telemetry values are placed In particular about CCD setting we have chip area dimensions in x and y pixel box dimensions in x and y pixel position of the left down corner of the box in the chip read out mode exposure time of the last exposure system identifier ID binning and the four ground levels 29 TNG THE OIG USER MANUAL June 2000 S Benetti C Bonoli R Cosentino D Fantinel A Ghedina E Giro A Magazz Telemetry window can be activated with various settings to display instantaneous telemetry looped or image telemetry These possibilities are choose from the top menu 3 4 5 Auto Focus In the OIG user inter
10. OE UNS In the bottom of the window is present a 3 D representation of the sampled box Using the controls under this plot it is possible to change the point of view of the representation It is possible to switch to a 2 D representation cut along rows e Double click right button Now the same cursor enables the user to choose the coordinates of a box on the two chips These coordinates are reported in the sequencer table in the box fields see later DI TNG THE OIG USER MANUAL June 2000 S Benetti C Bonoli R Cosentino D Fantinel A Ghedina E Giro A Magazz CCD Status Palette Nm DOCE SHE Hn 000 1 Exposure started with 60 0000 sec for 1 SETGLO 52 0 Xs 553 Y 11324 val fai 439 Statistic Delete queue Mark 1 1050 5 Zoomed Image Zoom Factor w Mark 2 X position Y position exp number a repeat la of n object SN1999c1 Arch Comment Box o 1050 0 2100 F Auto cuts Jtv ay FLAT w DARK w BIAS OBJECT w WIPE Full Image MU Exp t 60 000 Ext t 0 0000 Row Profile SEQUENCER 3 120E4 3 110E4 3 100E4 3 090E4 3 080E4 focus Operation ende Fig 3 1 The OIG main user interface The other windows in the left part show e a zoomed part of the image moving mouse on the main display window the centre of zoom
11. cut are 0 95 1 05 The i flat field does not show any fringing because the twilight light has a continuum spectrum An example of scientific i image with the typical fringing pattern is given in the following figures 40 TNG THE OIG USER MANUAL June 2000 S Benetti C Bonoli R Cosentino D Fantinel A Ghedina E Giro A Magazz Fig 4 7 U Bessel 41 TNG THE OIG USER MANUAL June 2000 S Benetti C Bonoli R Cosentino D Fantinel A Ghedina E Giro A Magazz Fig 4 8 B Bessel 42 TNG THE OIG USER MANUAL June 2000 S Benetti C Bonoli R Cosentino D Fantinel A Ghedina E Giro A Magazz Fig 4 9 V Bessel 7 TNG THE OIG USER MANUAL June 2000 S Benetti C Bonoli R Cosentino D Fantinel A Ghedina E Giro A Magazz Fig 4 10 R Cousins 44 TNG THE OIG USER MANUAL June 2000 S Benetti C Bonoli R Cosentino D Fantinel A Ghedina E Giro A Magazz Fig 4 11 i Gunn 45 TNG THE OIG USER MANUAL June 2000 S Benetti C Bonoli R Cosentino D Fantinel A Ghedina E Giro A Magazz E Fig 4 12 i Gunn Band Konig 1096 45 FOCUS OPTIMIZATION TBW 5 USING OIG TBW 5 1 OIG START UP TBW 5 2 OIG SHUT DOWN TBW 5 3 OIG COOLING TBW 46 TNG THE OIG USER MANUAL 5 4 OIG TROUBLESHOOTING TBW 6 ACRONYMS A D Analog to Digital Converter BTAB Bias Table CCDC CCD Controller CCDSQ CCD Seque
12. eee po Xap fo e fe me esi fio rmm oo fisso Bo mo fusse fpo Bomoa oo fisso Bo mo psu fino vimm fi fo ee fo me puso Eo Ritson a fb ee fo me fesso Ro cm p fo fp me o feo Case feo ee fo m o fe a eo fee foo Paton o fe Case feo fee fo fm Eo figo rmm fero fsi fusi uer sss per H Fig 3 4 The sequencer interface This window permits to activate a sequence of exposures It is activated using the sequencer button in the main window interface Its layout is shown in Fig 3 4 it is a table of 10 exposure definitions in which the user can choose different set up Typically each lineis composed by 11 fields An activation button If the button is activated the line is posed in the sequence An exposure type list The user can choose between Flat Dark Bias Object Wipe A repeat field The selected exposure can be repeated until 9 times An identifier field This string will be put on the IDENTIFIER filed of fits header An exposure field The exposure time A filter list The user can choose between 18 positions on the two filter wheels 4 fields for the CCD boxing left and right columns down and up rows The default is the full frame CCD area A save button If set the image will be archived On the bottom of the window 5 buttons and a text field are present Their functionalities are the following De TNG THE OIG USER MANUAL June 2000 S Benetti
13. power distribution Once the main distribution power box is powered again the VME SERVICES can through a serial connection switch power to the services in Tab 2 3 via the control panel of Hig 2 14 220 Vacc plugs service Oy UY A G2 to DEROTATOR Tab 2 3 Powered systems 16 TNG THE OIG USER MANUAL June 2000 S Benetti C Bonoli R Cosentino D Fantinel A Ghedina E Giro A Magazz Telescope auxiliary services 1 Telescope Control Services M3 ATTENTION Move ONLY on zenith NOT Zenith VMEAOPT 1 ON OFF M3 Control M3 Switch M3 Piezo M3 Initialization M3 Initialization M3 Nas A Init M3 Nas B Init M4 Setup M4 Position Power Nas A Power Nas B Connection ON Eae Arnica ADOPT 1 Problems 12 0IG Initialization ON 0 Default 2 NIR Close Defaults Fig 2 14 Control panel for Telescope services 17 TNG THE OIG USER MANUAL June 2000 S Benetti C Bonoli R Cosentino D Fantinel A Ghedina E Giro A Magazz The derotator A power switch box The OIG filter wheel box Fig 2 16 The OIG cryostat and the OIG controller box 18 TNG THE OIG USER MANUAL June 2000 S Benetti C Bonoli R Cosentino D Fantinel A Ghedina E Giro A Magazz VMEOIG LRS ATX 240 OIG CCDCTRL 1 GR E BL M2M3AOPT fiber 3 BR OGCTRL 4 OR M1AOPT fiber BE LRS
14. the first parameter of the eev1 eev2 eev3 lorall loral2 loral3 eevl eev2 eev3 lorall loral2 loral3 oig btl sha btl shb btl tra btl trb btl rs btl loadboot command according to the following scheme Od WN tra btl sha btl trb btl shb btl boardl board2 boardl board2 2000 3000 2000 3000 9 TNG THE OIG USER MANUAL June 2000 S Benetti C Bonoli R Cosentino D Fantinel A Ghedina E Giro A Magazz 3 3 THE WORKSTATION SOFTWARE Communications between VME software and OIG user interface are permitted by WSS Its main duty consists in updating commands and telemetry queues between OIG Workstation WSOIG and OIG VME VOIG From WSS it is possible to start OIG User Interface simply clicking the relative button on the Nasmyth A panel 3 4 THE MAIN USER INTERFACE SOFTWARE When user interface is started the panel of Fig 3 1 will appear to the user This panel is divided into two main parts On the left a quick look is present while the right part permits the user to control the instrument At least on the top of the window the user can access to a pull down menu for other functionalities see below Referring to Fig 3 1 the typical user operations will be described Quick look facility appears divided into five parts On the left a main window displays full resolution image Under this window there are two slides to manually set cuts and two buttons devoted to set automatic
15. 2147 50 2097 4100 4199 T t 2148 X 4200 nnd 50 2097 4100 4199 beds 2098 2147 Left 1074 X 2100 0 24 25 1048 Right 1074 X2100 1049 1073 25 1048 T 2X2 1074 X 2100 lag 25 1048 NO 2050 209 mania 1049 1073 E Left 3X3 716 X 1400 0 15 16 698 699 715 1367 1399 Right 3X3 716X 1400 699 715 16 698 0 15 1367 1399 Two out 3X3 716X 1400 ae 16 698 NO 1367 1399 dida 699 715 i Tab 4 5 EEV 1 39 TNG THE OIG USER MANUAL June 2000 S Benetti C Bonoli R Cosentino D Fantinel A Ghedina E Giro A Magazz Readout Mode inni X prescan X image X Overscan Y overscan Left 2148 X 4200 2148 2197 2198 4245 4246 4295 4100 4199 Right 2148 X 4200 4246 4295 2198 4245 2148 2197 4100 4199 2148 2197 Two outs 2148 X 4200 1246 4295 2198 4245 NO 4100 4199 Left 1074 X 2100 1074 1098 1099 2122 2123 2147 2050 2099 Right 1074 X 2100 2123 2147 1099 2122 1074 1098 2050 2099 1074 1098 Two outs 1074X 2100 5154 2147 1099 2122 NO 2050 2099 Left 716 X 1400 716 731 732 1414 1415 1431 1367 1399 Right 716X 1400 1415 1431 732 1414 716 731 1367 1399 716 731 1415 1431 732 1414 NO 1367 1399 Two outs 716 X 1400 Tab 4 6 EEV 2 The value of this pixel is a mean of overscan and image area 4 4 FLAT FIELDING OIG In the following examples of U B V R i normalised sky flat fields are given in Fig 4 7 to Fig 4 11 The images
16. 3 1989 Ref 7 Carter et al SPIE 1235 644 1990 Ref 8 Bortoletto et al Transputer Appl and Systems 94 161 1994 Ref 9 Reiss SPIE 2198 895 1994 Ref Ref Ref Ref Ref Ref Ref Ref 10 Leach proceedings of Tucson conference CCDs IN ASTRONOMY 171 1989 11 Bortoletto D Alessandro Rev Sci Instr 57 253 1986 12 Comoretto et al Arcetri technical report NICS camera infrarossa TNG 4 1995 13 Gai et al SPIE it proc 2198 962 1994 14 SUNDANCE SMT227 Fibre Optic TRAM manual 15 INMOS D7405 TOOLSET development SW 16 INMOS The TRANSPUTER databook 17 MOTOROLA DSP36001 Digital Signal Processor User Manual 48 TNG THE OIG USER MANUAL June 2000 S Benetti C Bonoli R Cosentino D Fantinel A Ghedina E Giro A Magazz 8 LIST OF FIGURES Fig 2 1 The Nasmyth Interface mounted on The Derotator A without instruments iii 2 Fig 2 2 The OIG and ARNICA cryostats mounted on NIA eesesssesseeeeeee e 3 Fig 2 3 Internal view of the cold plate with the CCD mosaic esee eee iene 4 Fig 2 4 The filter whe el system as seen from the outside of the NIA ei 5 Fig 2 5 Schematic drawing of the filter wheel system The other wheel has the same component arrangement 7 Fis 2 6 Shutter block diagram grate emere RE Een ib tee P
17. CTRL LRS CCDCTRL 19 3 THE SOFTWARE 3 1 THE CCD SOFTWARE The CCD control software is written in OCCAM language see the CCD CONTROLLER SYSTEM manual for more info In Tab 3 1 there is a list of available commands TNG THE OIG USER MANUAL S Benetti C Bonoli R Cosentino D Fantinel A Ghedina E Giro A Magazz June 2000 INDEX OCCAM DESTINATION OPERAND ACTION OPERAND GATE OPCODE NUMBER MODE CLASS ACRONYM 0 OPCD SETSA DSP560 PE NOWAIT NUM setsa 1 OPCD SETSB DSP560 PE NOWAIT NUM setsb 2 OPCD SETLC DSP560 PE NOWAIT N setlc 3 4 NAN OPCD SETLED DSP560 PE NOWAIT setled OPCD SETGLEDI DSP560 PE NOWAIT YUM OPCD XMDUMP DSP560 PE WAIT NUM xmdump OPCD GETID DSP560 PE WAIT NUM getid NUM N YUM setgled1 OPCD LOADTAB DSP560 PE NOWAIT STRING loadtab eo o OPCD DOSCAN OPCD WIPE OPCD TONOFF DSP560 PE BROAD DSP560 PE N O N NOWAIT WAIT NOWAIT NUM NUM NUM doscan wipe tonoff OPCD BSHUTCR DSP560 PE NOWAIT NU M bhutcr 1 OPCD RDBSTIME OPCD ISHUT DSP560 PE DSP560 PE O WAIT NOWAIT NUM 3 14 OPCD CLCOUNT DSP560 PE NOWAIT NUM clcount 15 NUM rdbstime ishut OPCD SCCDTEMP DSP560 PE NOWAIT NUM sccdtemp I OPCD RDTEMP OPCD SETAREA DSP560 PE BROAD WAIT WAIT NUM 7 18 OPCD SETSTSI D
18. HARDWARE ia AR ALe 2 1 THE NASMYTH A USER INTERFACE irene reverse acerco 22 PHEOIGCRYOSDAE e 2 3 THE OIG FILTER WHEEL SYSTEM nicotina iii 24 THE OIGDOUBLE BLADE SHUTTER cuencia Svein E CHA Re anes cava ane ae 2 5 THE OIG CCD CONTROLLER CCDC cccsesssssssesseesssesesssssscessossesssssssssccssensosuasseonsoessoescessessonscesssoesessesssorsessssaronsces 2 0 THE SYSTEM POWER SUPPLY e temer eere ori SERERE 3r PAE SOB AW ARES Sostiene eet SJ THECCDSOBTWABE niei meme lie 32 DHENMESOEEWARE ita ico 33 THE WORKSTATION SOFTWARE cocinar 34 THE MAIN USER INTERFACE SOFTWARE 34 1 ihe BootInietiaoesz o lc 3 4 2 The Sequencer Interaction 3 4 3 Menu Encina Giai 28 344 The Telemetry Interface 3 4 5 Auto FOCUS siesta seas M ASTRONOMI 31 Zl HEPBLETBRSYSEBNE ail 4 1 1 Filter Mechanics lai nai Rc he ee ll date aera HE SE HERE sb TER 4 2 OIG DETECTOR MAIN CHARACTERISTICS 42 1 Uniformity cnc 4 2 2 Quantum Efficiency een 4 23 Dark Curt ieee Gad se eee a ee ee S 4 24 Charee Transt r BffiCIency outer bu eee iia 4 3 CCDIMAQGE ao baka end a 44 ELAT FIELDINGOIG ao dita dunt t tS 45 POCUS OPTIMIZATION aid 5 USING OIG ceinen e aine re eiecerunt ii od OIGSTARTEUD ete ene eerie a 2 2 OICGESHUTEDONW NN id asistir fubit oid 33 0IG COOLING ili a PEE 4 OIG TROUBLESHOOTING itt tra EEEE oL EE e n iet RETE ra Aces e
19. SP560 PE NOWAIT NUM setsts1 19 NUM rdtemp setarea OPCD SETBOX BROAD WAIT NU M setbox 2 OPCD SETRMODE OPCD NCCD BROAD BROAD SIN WAIT WAIT N NUM NUM YUM 1 22 OPCD BINNING BROAD WAIT binning 23 setrmode nccd OPCD SETRLEDI LESI PE NOWAIT setrled1 25 OPCD CKHIGHI LESI PE N RyRy N NOWAIT Eb ckhighl 26 OPCD CKLOWI LESI PE NOWAIT T cklow1 27 OPCD VOFS 1 LES1 PE NOWAIT vofsl OPCD WLESREGI LESI PE NOWAIT wlesregl 2 OPCD SETBIAS OPCD TLMSTOP LES1 PE ATX260 PE N DN WN NOWAIT NOWAIT S setbias 9 30 OPCD TLMSTART ATX260 PE NOWAIT tlmstart 31 tlmstop OPCD EXPOSE ATX260 PE NOWAIT expose 3 OPCD STOP OPCD PAUSE ATX260 PE ATX260 PE e WwW oj NOWAIT NOWAIT 444434 stop 3 34 OPCD ABORT ATX260 PE NOWAIT T abort 35 pause Ol O oj OPCD RESUME ATX260 PE NOWAIT NUM resume OPCD EXTEND ATX260 PE NOWAIT NUM extend OPCD BOOTDSP ATX260 PE NOWAIT NUM bootdsp 39 OPCD TNODE NODE PE 1 WAIT NUM tnode TNG THE OIG USER MANUAL June 2000 S Benetti C Bonoli R Cosentino D Fantinel A Ghedina E Giro A Magazz 40 OPCD FSHOT 41 OPCD SETVDD DSP560 PE 1 NOWAIT ATX260 PE 2 NOWAIT Tab 3 1 List of CCD commands NUM fshot s
20. TNG THE OIG USER MANUAL June 2000 R Cosentino D Fantinel A Ghedina E Giro S Benetti A Magazz TNG THE OIG USER MANUAL June 2000 F Bortoletto R Cosentino D Fantinel A Ghedina E Giro S Benetti A Magazz Document available at http www tng iac es TNG THE OIG USER MANUAL June 2000 S Benetti C Bonoli R Cosentino D Fantinel A Ghedina E Giro A Magazz 1 INTRODUCTION The scope of following document is to give a detailed operational desc ription of the Galileo Optical Imager OIG Targeted persons for the use of this document are the telescope operator the instrument astronomer the guest observer and every maintenance technician Due to the large standardisation of parts present in the TNG telescope it should be noticed that the description hereinafter is valid both for the handling of the scientific CCD cameras and for the service CCD cameras trackers Shack Hartmann 2 THE HARDWARE 2 1 THE NASMYTH A USER INTERFACE The Nasmyth Instrument Interface A NIA in the following is the interface between the Telescope and the scientific instruments on the telescope arm A It is mounted on Derotator A and thus rotates with it The NIA is composed of 4 main pieces ranging in weight between roughly 200 and 950 kg each and several other minor elements When mounted it is like a parallelepiped measuring nearly 0 5x2x4 meters You can see a picture of NIA in Fig 2 1 Rotation axe of NIA
21. cally all in the wheel 2 can be filled with user provided filters In this case the filters should have a diameter of 106 0 0 2 mm and a thickness of less than 10 0 mm In the following Fig 4 1 you can find the transmittance curves for the OIG filters as given by the manufacturer UT TNG THE OIG USER MANUAL June 2000 S Benetti C Bonoli R Cosentino D Fantinel A Ghedina E Giro A Magazz Fig 4 1 Transmittance curves for the OIG filters mee TNG THE OIG USER MANUAL June 2000 S Benetti C Bonoli R Cosentino D Fantinel A Ghedina E Giro A Magazz Gunn Filters 100 90 80 A LAM 70 60 at 1T R aL LLL MM ft ot 4 E 1 n T RF O 400 500 600 700 800 900 1000 Wavelength nm G Gunn R Gunn Gunn Z gunn Fig 4 2 Gunn filters Transmittance 4 1 1 Filter Mechanics The two OIG filter wheels can allocate 9 filters each two holes are permanently empty for a total of 18 filters continuously available Custom filters can be inserted temporarily on the system provided they can fit with the dimensions of the filter cage shown in Fig 4 3 2233 TNG THE OIG USER MANUAL June 2000 S Benetti C Bonoli R Cosentino D Fantinel A Ghedina E Giro A Magazz 77 e e REC a _E MW E amp xem To ot t 4 SAN CA Fig 4 3 The filter cage on the OIG filter wheel 4 2 OIG DETECTOR MAIN CHARACTERISTICS T
22. cuts and to perform a simple TV scaling of the image The graphic window is active in the sense that the user can use it interactively with the mouse buttons e Right button a square cursor will appear to the user to select a sample The central part of the sample the inner square will be considered the star signal while the outer area will be considered sky To change sample dimensions click on one corner of the box with central button and drag it A maximum of 400x400 pixels area is permitted To change box position draw it with the left button At this point there are two possibilities to confirm the choice e right button At this point a Statistics window see fig will appear In the top of this window a tabular representation of the most important statistical quantities is reported FWHM x the FWHM along rows if gaussfit converges FWHM y the FWHM along columns if gaussfit converges X position in pixels Y position in pixels Minimum value in the box Maximum value in the box Mean value in the box Sky level RMS adu in the box 10 Total signal in the box 11 Offset in R A arcsec to put the selected object the in position of the desired marker 12 Offset in DEC arcsec to put the selected object the in position of the desired marker 13 Angle of major axis of the elliptical gaussfit 14 Selection of the desired marker on which to calculate the offset 15 Button to calculate the telescope offset 19 OV
23. e e HERE aise eis 9 Fig 2 7 Schematic view of the double blade shutter operations ie 10 Fig 2 8 Schematic drawing of the curtains inside the shutter rie 11 Fig 2 9 CCDs readout System iis sette east dove EUH pe De e DG ee ee 12 Fig 2 10 CCDCTRL front and rear sides of the main DOX essere nente nennen entente tnn tnnt eene 13 Fig 2 11 Main parts of the CCD controller system iii 14 Fig 2 12 VMEOIG tacks sc its Seite east Gk ela needed ea die eit dl aan ead 15 Elg 2 1301G power distri 16 Fig 2 14 Control panel for Telescope SErvices ee Fig 2 15 The OIG filter wheel box and the OIG power distribution socket Fig 2 16 The OIG cryostat and the OIG controller box eese eene eee Fig 3 1 The OIG main user interface ie Eig 3 2 The Statistics window sii rrt eie rai Eee nb ee REQUE DeC pr RE IRSE eee die 26 E1g 3 3 The boot nterlace enero bue e o a tre RENE ree eet ce EE LEE AV Fig 3 4 The sequencer interface sse E19 3 5 The telemetry interface citada E19 3 6 The focus window issih doe aaa Fig 4 1 Transmittance curves for the OIG filters iii OT EAE Gunn PUES E Fig 4 3 The filter cage on the OIG filter wheel nerit reete tee tef erre ben aiar Fig 4 4 OF OF the EEV 4280 m
24. ed region consequently changes zooming factor is set using the slider under this window A full frame image to show the selected positions of the markers Clicking on elsewhere position puts this position in the centre of the main display window The right part of the main interface is dedicate d to display actual camera settings and statistics In particular there are A log box for the messages between interface and low level CCD software A box of quick access statistic x y and pixel value at the position of cursor A facility to set the positions of the markers The order number of exposition see sequencer interface section Object s name Archive flag 24 TNG THE OIG USER MANUAL June 2000 S Benetti C Bonoli R Cosentino D Fantinel A Ghedina E Giro A Magazz e Eventual comment e CCD box e exposure s type e button to activate sequencer e button to control CCD stop abort transmit pause resume extend commands To extend exposition put the number of seconds with sign to add in the left field ext t During an exposition a timer slider appears at the bottom of the window In the bottom part of the window two plots are displayed e profiles in row and column activated with left click of mouse e statistic of counts over a box of 40x40 pixels At the end other four controls are present e acommand input to send single commands to the low level e an option between row and column for prof
25. enetti C Bonoli R Cosentino D Fantinel A Ghedina E Giro A Magazz Manufacturer LORAL OIG EEV4280 Linearity lt 0 15 Uniformity 3 4 CTE 199999 Quantum Efficiency at 400 nm 92 82 600 nm 80 94 900 nm 30 41 Read out Noise Conversion factor chip SX 1 e ADU Conversion factor chip DX 1 e ADU Readout time Binning X 1 Binning X 2 Binning X 3 Tab 4 4 ee 4 3 CCD IMAGE The structure of the CCD EEV4280 is showed in Fig 4 6 2048 IH 1 4100 IV PIXELS 13 5 pm SQUARE I 50 BLANK i 50 BLANK ELEMENTS ELEMENTS W f Fig 4 6 EEV4280 structure 38 TNG THE OIG USER MANUAL June 2000 S Benetti C Bonoli R Cosentino D Fantinel A Ghedina E Giro A Magazz The image area of the CCD is 2048 X 4100 pixel while the length of the output register is 2148 pixel The dimension of the image produced by the acquisition system is 2148 X 4200 pixels without binning This means that the prescan and overscan zones depends by the readout mode and by the binning utilised The User Interface allows different acquisition modes and different binning on chip In Tab 4 5 and in Tab 4 6 the overscan and prescan zones for the different kind of acquisition are showed Readout Mode Binning Image Size X prescan X image X Overscan Y overscan Left 2148 X 4200 0 49 50 2097 2098 2147 4100 4199 Right 2148 X 4200 2098
26. etvdd 3 2 THE VME SOFTWARE The OCCAM code handling CCD cameras is the same for ALL cameras mounted at the TNG telescope that is commands and telemetry responses are the same for all systems Each camera is controlled by a dedicated VME crate mounting GATE software VMEs involved in camera handling are e VMEOIG vmeoig tng iac es for OIG instrument e VMEAOPT vmeaopt tng iac es for Active Optic system and Tracking and Shack Hartmann cameras e VMELRS vmelrs tng iac es for DOLORES instrument VME software GATE has some tasks to manage the system that are common to all VME crates they are listed in Tab 3 2 Applicative tasks are system dependent and are listed in Tab 3 3 in Tab 3 4 and in Tab 3 5 TASK ID FUNCTION RUN TIME MODE GATE Task Handler user super TASKI Micro commands from WS User TASK2 Micro commands dispatching User TASK3 Alarms Handling user super TASK4 Telemetry to WS User TASKS Images to WS or to disk user super TASK6 Global access Handling user super TASKIO Heart beat User Tab 3 2 GATE common tasks TASK12 OIG telemetry user super OIG controller commands OIG boot command user super TASKI9 OIG filter wheel Handling user super Tab 3 3 OIG tasks TASKII AOPT commands user super TASK12 AOPT telemetry user super TASKI3 Tracking and SH cameras user super TASKIS Miscellaneous commands user super Tab
27. face it is also implemented an auto focus procedure It consists essentially in a sequence of images with different M2 positions The different FWHM are calculated and a 2nd order polynomial fit is obtained The parabola minimum is the best focus position To use this facility perform the following instructions Take a full frame image Open the sequencer and load the file focus exp Select a box with one star in the left chip Edit the repeat field in the sequencer You can choose between 3 and 9 exposure A good choice may be 6 Fill the temperature field in the bottom left Start exposures At the and of the sequence click focus button on the bottom of the main window A window like Fig 3 6 will be displayed Eventually deselect some wrong measurements Press calculate Two parabolas x and y fit and the calculated focus positions will be displayed Fig 3 6 The focus window 30 TNG THE OIG USER MANUAL June 2000 S Benetti C Bonoli R Cosentino D Fantinel A Ghedina E Giro A Magazz 4 ASTRONOMY 4 1 THE FILTER SYSTEM The presently available filters and their main characteristics are listed in Tab 4 1 dd d uU por poi e eo pases a R p pgs e m e m pis e io p p p CC CL ps ps 5 T9 p Eo po po pia Tab 4 1 Filters characteristics They are identified on the CCD user interface directly with the corresponding name The 10 filter positions still free basi
28. gh a Xenon lamp a series of filters and a monochromator The signal integrated on the CCD is then compared to the response of a calibrated photodiode EEV 42 80 RQE X 2000 4000 6000 8000 16000 wavelength A Fig 4 4 QE of the EEV 4280 4 2 3 Dark Current The dark current is measured taking a short dark exposure and a long dark exposure The signal level in the two exposures is then compared The frame is divided in 10 10 pixel sub frames and the dark current is computed for each of them The results of this procedure are shown in figure as a histogram in the case of the CCD EEV42 80 The average value of the dark current turns out to be 6 electrons pixel hour 36 TNG THE OIG USER MANUAL June 2000 S Benetti C Bonoli R Cosentino D Fantinel A Ghedina E Giro A Magazz 4 2 4 Charge Transfer Efficiency The charge transfer efficiency CTE is measured using the X ray stimulation method In particular the parallel CTE is obtained exposing the CCD to the Fe55 source for a given amount of time After integration the columns are stacked together and the signal is plotted versus the number of pixel transfers The CTE is then given by CTE 1 Charge loss 1620 e N CTE 1 s 0 s 4095 s 0 4096 The LORAL CTE turned out to be 0 999982 while the EEV exhibits a CTE of 0 99999 ime 28 02 acond Fig 4 5 Misalignment of OIG s mosaic Ae TNG THE OIG USER MANUAL June 2000 S B
29. he CCDs used in TNG instrumentation are EEV 4280 2048x4096 and Loral 2048x2048 Their characteristics are summarized in the following Tab 4 2 34 TNG THE OIG USER MANUAL June 2000 S Benetti C Bonoli R Cosentino D Fantinel A Ghedina E Giro A Magazz Manufacturer LORAL EEV4280 Chip Type Thinned Back illuminated Thinned Back illuminated Pixel size 15 um 13 5 um Area 2048 x 2048 2048 x 4096 Readout noise 12e 10e MPP Yes No Working temp 110C 130 C UV treatment Chemiosorption Cu layer Ion implantation AR Coating Yes Yes Grade 2 both 2 amp 3 Tab 4 2 CCD s characteristics 4 2 1 Uniformity The homogeneity of the CCD is measured using a standard method of illuminating it at different wavelengths with a uniform source of radi ation and calculating the RMS all over the sensitive area The deviation from homogeneity is given by the following expression Deviation form Homogeneity o whole area mean whole area nm LORAL EEV4280 400 32 39 550 34 34 700 33 57 900 37 52 Tab 4 3 Deviation from uniformity 35 TNG THE OIG USER MANUAL June 2000 S Benetti C Bonoli R Cosentino D Fantinel A Ghedina E Giro A Magazz 4 2 2 Quantum Efficiency The CCD quantum efficiency QE was measured in the wavelength interval 2000 10500 in incremental The CCD was illuminated using monochromatic light obtained throu
30. he two filter wheels You don t need to give this command when using commands like the previous ones because opening and closing the brakes is automatic in those procedures DISBRAKE w This command can be sent without initialising the system It opens the brakes on one of the two filter wheels You don t need to give this command when using commands like the previous ones because opening and closing the brakes is automatic in those procedures ROTABS w val This command could be sent without initialising the system It moves one of the filter wheels to the absolute position val Never use this command if the system is not initialised OR if you don t know exactly what could be the consequences When the system is not initialised usually the encoder s counts start from the actual position and can be both positives and negatives with values ranging roughly from 1670000 to 1670000 If the wheels move very fast and is sent to an encoder value position which is further than the proximity sensors it is possible that the proximity sensors don t recognise the edge and thus are not able to stop the rotation in time If this happens one can get the filter wheel to be locked between the proximity edge and the mechanical edge TNG THE OIG USER MANUAL June 2000 S Benetti C Bonoli R Cosentino D Fantinel A Ghedina E Giro A Magazz ROTREL w val This command could be sent without initialising the system It moves one of the filter wheels t
31. his check is performed by the command CONNST If there is exchange of information between the two systems a message appears The OIG Filter Controller is connected If on the other hand the connection is not present one sees ATTENTION The OIG Filter Controller is NOT connected This is probably due to the fact that the power of the rack is switched off or the serial cable is not connected Check these two possibilities before proceeding INITFILT This is a fundamental command if someone wants to drive the filter wheels in fixed positions such as the clear position and a filter or an EPROM specified by their number It is anyway safer to use it always soon after the CONNST command If the connection is up the filter wheels start to rotate and search fort their respective edges then set to zero their encoder s counts and move away from this position they rotate roughly to the clear position The whole procedure can take a few minutes and in the meanwhile messages appear to inform the user about the correct or wrong proceeding of the initialisation Then the system is ready to receive safely any of the following commands It can often happen that when the filter wheel is initialised being far from the edges position the system goes in Time Out For safety reasons Time Out happens roughly 20 seconds after the beginning of the initialisation while it takes much more time to the filter wheels to complete one whole turn during this phase
32. iles plot e a button to activate automatic focus procedure e astatus bar In the right bottom part a button permits to open boot interface 3 4 1 The Boot Interface The boot interface permits to boot the transputer network with different boot tables The window on the left shows a schematic view of the transputer net In the left five buttons permit to perform several action e Boot boot the net with selectable tables it is a pull down menu e Test net test the functionality of the transputer network When boot is loaded the system waits until VME sends acknowledgement to the interface In the bottom part the commands sent to CCD are displayed e View e Ispy load ispy e Done quit from boot interface 205 TNG THE OIG USER MANUAL June 2000 S Benetti C Bonoli R Cosentino D Fantinel A Ghedina E Giro A Magazz Fun He o 219950 Fi r F1 95582 position xy 2 3204 position Y 49 3510 kii 131071 nex 31945 F31856 6 set 31856 8 hrs 8 63236 STR 6 9924 OFFSET RA m OFFSET Tec D 0 924876 Narker 1 Narker 2 OFFSET TEL 30 Mit JA LI Rotation around X axis Rotation around Z axis Plot Fit Row lt ut p 7 Surface Fig 3 2 The Statistics window Fig 3 3 The boot interface 26 TNG THE OIG USER MANUAL June 2000 S Benetti C Bonoli R Cosentino D Fantinel A Ghedina E Giro A Magazz 3 4 2 The Sequencer Interface
33. ime is 10 ms The present OIG user interface allows the operator to insert a minimum exposure time of 0 1 Sec we found this minimum exposure time doesn t introduce any appreciable error on the taken frames The control electronics is located in the filter control rack and provides a simple interface to the CCD controller Fig 2 6 shows the shutter block diagram and Fig 2 7 shows the operating modes of the shutter A schematic drawing of the curtains inside the shutter is shown in Fig 2 5 ENCODER ON OFF RST FEM Expo Fig 2 6 Shutter block diagram TNG THE OIG USER MANUAL June 2000 S Benetti C Bonoli R Cosentino D Fantinel A Ghedina E Giro A Magazz B T i e To i UPPER BLADE LL E gt MI LOWER BLADE THE SHUTTER IS READY TO BE OPEN both blades are loaded THE SHUTTER IS OPENING upper blade is moving while lower blade is loaded THE SHUTTER IS OPEN upper blade is open while lower blade is loaded THE SHUTTER IS CLOSING upper blade is open and lower blade is moving THE SHUTTER IS CLOSE both blades are open THE SHUTTER IS CLOSE both blade are loaded THE SHUTTER IS READY TO OPEN both blades are loaded ao E Fig 2 7 Schematic view of the double blade shutter operations 10 TNG THE OIG USER MANUAL June 2000 S Benetti C Bonoli R Cosentino D Fantinel A Ghedina E Giro A Magazz Fig 2 8 Schematic drawing of the curtains inside the shutter
34. ing the filter wheel when working under the user interface environment is much easier There is only one button to press in order to check both the connection status and to initialise the filter wheel From a pop down menu it is then possible to choose which filter to set for the observation The same commands given under VME can be sent from the command line in the user interface Solving Problems If after 2 or 3 initialisations the filter wheel seems to be not responding correctly it is possible that it got stuck between the mechanical edge and the proximity sensor It is necessary to set it free with GATE commands from the VME or from the user interface depending on which one you are using It is a very simple procedure and it consists only in giving relative movements to the wheel that got stuck with the command ROTREL w val see above Just remember to give always positive values for wheel 1 and negative for wheel 2 TNG THE OIG USER MANUAL June 2000 S Benetti C Bonoli R Cosentino D Fantinel A Ghedina E Giro A Magazz 2 4 THE OIG DOUBLE BLADE SHUTTER The OIG double blade shutter is designed to cover the whole field of the optical imager The working area is 80 X 80 mm and the dimension is 220 X 150 X 35 mm Thanks to a peculiar double blade mechanics and a two step motor driving system the shutter assures a uniformity of exposure time of 0 8 ms over the whole field when exposed for sec while minimum exposure t
35. ncer CDS Correlated Double Sampler CPU Central Processing Unit CTAB Conversion Table D A Digital to Analog Converter DRO Direct readout DSP Digital Signal Processor EPROM Erasable Programmable Read Only Memory FPA Focal Plane Array HW Hardware ICF Instrument Command File IR Infra Red NIA Nasmyth Instrument Interface A NIB Nasmyth Instrument Interface B RMR Readout Micro Routine OICC Optical Imager Control Computer OIG Optical Imager Galileo OS Operating System RAM Random Access Memory ROM Read Only Memory SEDIT Status Editor SQT Sequencer Tick SW Software TBD To Be Decided TRAM Transputer Module VME Versa Module Europe VMEIF VME Interface WFTAB Waveform Table WS Work Station WT Working Table TR Tristate O C Open Collector Std TTL Standard TTL 7 REFERENCES Ref 1 CCDWG Functions and requirements for the Galileo CCD cameras Ref 2 CCDWG Architecture of Galileo CCD cameras 47 June 2000 S Benetti C Bonoli R Cosentino D Fantinel A Ghedina E Giro A Magazz TNG THE OIG USER MANUAL June 2000 S Benetti C Bonoli R Cosentino D Fantinel A Ghedina E Giro A Magazz Ref 3 PERIMOS DTM560 DSP TRAM User Manual Ref 4 PERIMOS DTM560 TOOLBOX User Manual Ref 5 Bortoletto et al SPIE it proc 2654 248 1996 Ref 6 Smith proceedings of Tucson conference CCDs IN ASTRONOMY 15
36. o the relative position val What is written for the previous command is still true here Never use this command if the system is not initialised OR if you don t know exactly what could be the consequences When working under VME it may be necessary to read the values of the global variables that are used by this task Should this occur one has to write from the GATE prompt gt glob 400 The list of Tab 2 2 appears only with the number and value of the global variables and the time of last modification To exit from the list the command is gt Q uppercase Name F Description Before After Init Init INIT 400 nitialisation status 0 1 BIUZ 401 Bit 0 status wheel 1 0 0 0 1 BIUU 402 Bit 1 status wheel 1 0 I 0 1 BIUD 403 Bit 2 status wheel 1 0 0 0 1 BIUS 404 Bit status wheel I 0 0 BIDZ 405 Bit 0 status wheel 2 0 0 0 1 BIDU 406 Bit 1 status wheel 2 0 1 0 1 BIDD 407 Bit 2 status wheel 2 0 0 0 1 BIDS 408 Bit7 status wheel 2 0 0 FILT 409 Filter number 0 0 0 18 BRAI 410 Brakes status of wheel 1 0 1 0 1 BRAZ 411 Brakes status of wheel 2 0 1 0 1 POSU 412 Position of wheel I 0 25000 POSD 413 Position of wheel 2 0 33000 0 1670000 ERPI 414 Rrror position of wheel I 0 5 1670000 ERP2 415 Rrror position of wheel 2 0 lt 5 1670000 CONX 416 Connection status 1 1 BALU 417 Baluff EPROM number 0 0 0 18 Tab 2 2 List of global variables used in TASK19 Mov
37. of the NIA The program which allows operating the filter wheels is written in C and works under the PDOS operating system The executable program TASK19 c is physically on the hard disk partition number 12 of VMEOIG All VME systems can work in user or super mode if in super mode test and debugging phase proceed as follows to get there one has to connect a terminal or sort of to the VMEOIG then to go to the hard disk partition 12 if not already there with the command gt cd 12 and from there to start the GATE environment with gt gate super All necessary tasks are spawned and a GATE prompt appears From now on it is possible to send the commands listed in Tab 2 1 to the filter wheels The command to exit from GATE is exit CONNST To check the connection status INITFILT To initialise the filters wheels CLEAR To select no filters FILTER n To select filter number n BALUFF n To move filter number under the Baluff sensor ROTABS w val To move the wheel w to the absolute position val ROTREL w val To move the wheel w of val counts ENBRAKE w To close brakes on wheel w DISBRAKE w To open brakes on wheel w Tab 2 1 List of commands to TASK19 TNG THE OIG USER MANUAL June 2000 S Benetti C Bonoli R Cosentino D Fantinel A Ghedina E Giro A Magazz CONNST It is necessary to check the status of the connection between the VMEOIG and the NIA filter wheel before sending any command T
38. ront and rear panel it is mounted near the OIG cryostat on the Nasmyth A instrument adapter see Fig 2 2 The front panel provides the four main connectors to the cryo head J1 the clock connector J2 the bias connector J3 the temperature connector The shutter connector mper 12 TNG THE OIG USER MANUAL June 2000 S Benetti C Bonoli R Cosentino D Fantinel A Ghedina E Giro A Magazz The rear panel shows the following parts The ON OFF power switch The main plugs The 4 plugs for the fiber link The DSP and the TRANSPUTER control LEDS Green and Red respectively The switch for the LED inhibition J3 connector J1 connector Temperature controller Shutter DSP amp Tputer CCD clocks connector LEDs ES DIOE Thermoelectric Mains input amp J2 connector head temperature power switch CCD bias setting Fibre optic link connectors Fig 2 10 CCDCTRL front and rear sides of the main box In Fig 2 11 one can see a block diagram of the main parts of the CCD controller system and in Fig 2 12 the VMEOIG rack is shown 13 TNG THE OIG USER MANUAL fibre optic DS link 1Km max distance VME VSB i i sequencer board transputer adapter i i CCDSEQ internal bus PCI BUS power supply transputer adapter i i host dapter interface i system CCDCTRL box Fig 2 11 Main parts of the CCD controller system 14
39. tui dil ier dons tasses ttd MEE IO OA N E 7 ossi dh Glen T JLISTOEBRBIGURES iietcee terio aaa 9 LIST OB TABDES ln 10 SUMMARY caia SRE ecole deeded ap eee Se ech E 50
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