The IRIS User Guide
Contents
1. r T dddc 05 x 8 43 v 50 55 0 5 5 2 152 7737 IF DF X OP L X OF X BITLIS 5 4 0 a ar 31715231 3274375 Gus Th 35 1 1 NO 35 MUS 2 dda oS x E Es wnodv TW oF x Li x x Fi un WHL Eh av z Gas EE OL 22 Saleen EIHL uxo 0 90 990 5 2 9 44 APPENDIX IX Command Line Scripting Scripting on the PC is done via an Open GENIE window The command style is COMMAND QUALIFIER value1 value2 keyword1 value3 keyword2 value4 For example CHANGE title new title user new user CSET CONTROL temp1 4 0 Character strings must always be included in quotation marks this is to distinguish them from words or functions that form part of the GENIE language and so make interpreting the language easier to program Below are a list of commonly user commands PC Command syntax example Action CHANGE title new title string Change the current run title CHANGE user new user string Changes the current user s CHANGE rbno 123456 integer Changes experiment RB number UPDATESTORE Created a SAV file which is copied to the analysis PC WAITFOR uamps 5 3 real Sets number of uamps to wait for WAITFOR frames 4000 integer Sets number of frames to wait for WAITFOR seconds 10 real PC control waits for N seconds before continuing END Creates RAW files and copies it to analysis PC PAUSE Paus2. 0 Curved glass guide 50 matched 234 A3m EH renee ras mim A JA R 2 353km Imm im 1 7m 6 4m llm 35 5m 36 54m Figure 1 7he IRIS primary spectrometer 1 0E 5 9 0E 4 8 0E 4 OSIRIS 2010 7 0 4 IRIS 2009 6 0E 4 5 0E 4 4 0E 4 3 0E 4 2 0E 4 0E 4 0 0E 0 Ce d q C ea 4 98 L 4 C O Lu c O k lt 10 15 20 Neutron Wavelength A Figure 2 White beam wavelength distribution at incident beam monitor note that the Incident Beam Monitor of OSIRIS before the converging guide ii The Secondary Spectrometer Hydrogen moderator at Converging 36 37m from sample supermirror Diffraction detector bank guide Ad d 0 0025 Mica analyser bank Spectra 105 to 114 Spectra 54 to 104 or 3t0 12 Resolutions Mica 002 Mica 004 Mica 006 1 Incident beam monitor Spectrum 1 Graphite analyser bank Spectra 3 to 53 Resolutions PG002 Transmitted PG004 beam monitor 4 Spectrum 2 i 5 w i E In each detector bank the smallest spectrum number is associated with the smallest scattering angle Detectors at 175 ET uunc Figure 3 The IRIS secondary spectrometer The secondary spectrometer Figure 3 consists of a 2m diameter vacuum vessel containing two crystal analyser arrays pyrolytic graphite muscovite mica or fluorinated mica two 51 element ZnS scintillator detect
3. 5 E 8 Sample Stick CCR Buffer Transducer Default DAE journal zd Temperature Pase User Details Setpoint Setpoint Scripting Logging 296 97 Tempest ES BH _ Setpoint a pen GENIE 600 ane Dashboard 296 97 Proportional Error Reporting On off Autotune 400 juo V Report Bug my H Machine Status 200 29 45 A 290 00 Beam Status Proportional 5 zj 60 MCR News 1 00 E Derivative 285 00 Beam Logger Integral ae Power 1 00 60 00 Max Output Power 280 00 80 Derivative Ig 70 E j 100 00 60 275 00 10 00 40 0 AutoTune Max Output Power 205 100 00 E 1 j 0 270 00 265 00 Sensor calibration info 1 260 00 Sensor type RhFe Look up table 60 00 Config file name BAMPLE_D0451 CFG A 255 00 Sensor Data File d045 tbl 250 00 1 10 40 11 00 11 20 11 40 12 00 12 20 12 40 13 00 13 20 13 40 14 00 14 20 Figure 11 The Eurotherm Control window In addition data collection can be temporarily suspended when the temperature drifts outside of a specified range There are essentially two aspects to the temperature control 22 system the control PC for issuing the commands and the Eurotherm temperature controller The temperature controllers measure the millivolt output from resistance thermometers Rh Fe or Pt or thermocouples usually type K and control the temperatu
4. 16 16 Int s 10 10 50 Int s 40 100 200 999 Int s 60 60 300 Int s 60 30 x 34 Deriv s 0 17 1 67 1 67 8 3 Deriv s 6 7 16 7 33 3 166 5 Deriv s 10 10 50 Deriv s 10 5 x x APPENDIX V Reference Dose Rates How to treat radioactive samples ISIS duty officer x6789 gt 10uSv hour Store sample in the lead castle for it to decay gt 0 1uSv hour Store sample in IRIS active sample cupboard with sample record sheet The sample may NOT be removed from its container For removal from ISIS contact the duty officer lt 0 1uSv hour The sample is not radioactive For removal from ISIS contact the duty officer As a guide in the planning of your experiment given below are typical dose rates for an empty annular can Irradiation time 19 5 hrs Total beam current 2400uUA Flux on sample 1x10 n cm2 s Time from removal Dose rate on contact Dose rate at 10cm from sample from IRIS sample pit uSv hr uSv hr hrs Cap On Cap Off Cap On Cap Off 0 1 190 250 20 I TO 150 3 9 3 40 90 2 45 X L9 Ss 20 0 123 For comparison OSIRIS Irradiation time 14 5 hrs Total beam current 1800uA Flux on sample 2x10 n cm2 s Time from removal Dose rate on contact Dose rate at 10cm from sample from IRIS sample pit uSv hr uSv hr hrs Cap On Cap Off Cap On Cap Off 280 600 35 65 35 APPENDIX
5. Data collection vetoing is disabled if Sample falls outside HIGHLIMIT or LOWLIMIT SETEURO1 P 1 D 1 1 Sets PID values on Eurotherm controller No 1 P Proportional I Integral and D Derivative bands Can also set max power MP 100 and auto tune AT Suitable PID values for the different sample environment apparatus used on IRIS are listed in Appendix IV 3 1 6 Command files Automatic control of IRIS can be achieved using a simple user written command file Based on OpenGenie code command files are created using either Notepad or Wordpad and saved as a GCL file in the Users area on the U drive A simple example GCL file is given 23 below For more examples see Appendix IX PROCEDURE Example H Measure at T 1 5K on d range 1 and T 10K on pg002 cset control Sample 1 5 highlimit 3 0 lowlimit 1 0 drange 1 begin change title An IRIS experiment at T 1 5K d1 waitfor uAmps 50 end cset control Sample 10 highlimit 11 lowlimit 9 pg002 begin change title An IRIS experiment at T 1 5K d1 waitfor uAmps 50 end ENDPROCEDURE To load a GCL command type gt LOAD U user file gcl into the active Open Genie window or drag and drop the file onto the Open Genie window A GCL command file will not run unless it loads into Open Genie without error To start the procedure type gt Example 3 2 Data Visualisation and Analysis Data visualisation and subsequent analysis on IRIS utilises PC based s
6. 119 24 43 0 401 0 267 0 134 5 3m89 048 0326 0165 58 3262 0 532 0354 017 60 3808 0 618 0412 0206 66 5446 0 866 0578 0 289 68 5992 0 945 060 0315 69 6265 0 984 0 656 0 328 80 917 1358 0906 0453 86 10607 1519 1013 0507 88 1157 1 603 1069 0535 90 1187 1 629 1086 0543 96 13618 1756 1171 0586 98 14164 1788 1192 0597 99 14437 1 802 1202 0601 32 Q inv Ang Q values at elastic line for MICA analyser reflections 2 00 1 80 1 60 4 1 40 Mica 006 Mica 004 Mica 002 1 00 0 80 0 60 0 40 0 00 54 59 64 69 74 79 84 89 94 99 104 spectrum number 33 APPENDIX IV PID Parameters PROP PROPORTIONAL BAND INT INTEGRAL TIME DERIV DERIVATIVE TIME as temperature increases INT and DERIV should be progressively decreased but keeping to a 6 1 ratio Orange Cryostat Temp K 5 10 20 10 300 20 Orange Cryostat control on the sample Temp K 1 20 20 50 50 100 150 300 TLCCR Temp K CCR Prop 96 F W Prop 2 2 2 2 Prop 1 Sample cold stick 1 Sample hot stick 1 RAL Furnace Foil element Temp Celcius 20 150 150 1000 1000 Prop 16
7. 2dsinO Bragg 2 are scattered toward the detector bank D equations 1 and 2 can be re formulated to give 2 2 2 2 cin 2 emere Zoe E 2 Tn 2 p uu d 2m 2m Mg 2m 2dqsin 3 where is the d spacing of the analysing crystal The distance from the sample position to the detector bank i e the secondary flight path L is accurately known Consequently the time t it takes for a detected neutron of energy E to travel a distance can be calculated using _ 2MyL2dq sin 0 t Tamo 4 Should interactions within the sample lead to a loss gain in neutron energy then a distribution of arrival times will result By measuring the total time of flight t ty t and by having accurate knowledge of t gt L and the energy exchange within the sample can be determined AE E E ma 2 E 5 t t2 t gt 1 2 2 Diffraction The diffraction detector bank on IRIS is used for either simultaneous measurement of structure vs quasi in inelastic information or purely crystallographic determination during a diffraction experiment Scattered neutrons reach the diffraction detectors without energy filtering and time of flight analysis is used to determine the d spacing of the observed Bragg reflections Here the scattering geometry is simplified Figure 5 with the scattering angle 26 replacing the scattering angle b shown in the Figure 4 D A Li gt gt L
8. A 5 5 0 158 gt AO ity zm 1 HITS IHS 3 alwa Gua Tiv JAQHIH OF SHLD JOH NYJ D OF N39 31931 5 55380 532NYH3 91 J NU NULLJAS ONY NO NSOd OIH 5DH312vVH H2 XVM HOTH Wwe N U Cc dJAVHOMJd J dWvi5 V 00 280 9C0P 5 E Y 40 y O0 O850 S800r 1 amp cz v 1143 HY 5 0 3 12095 5 CHO nim DE Do NOITE aren Tay Ge TM HEYET 1133 YY I NNV mu Hi 3 TAKE Hi 343315 JATTE HINNI CEET moz aum OW used EN F3 eure y 00 060 800P 15 7 v 41 FLAT CELLS 131 15 5537 0 A 5 1517 431 i35 u HALIL 3524305 dS 8 BIS TT Egr 8 NILE OH x52 0115 l RIVIS OH 75 3 OLIS 01 mavens 7 8 C 7j HS Ho o o lu os OF HHI 0FI 9 E OF OF FHM 4 SKDS 5 1 POGODI EME LE AZEN IDI 1 MO 5 EM 1300 1 F E v Lu es T ce Me T C Jl C ca C T 42 Nas dra OF X OP Or X Ov 3lV d LYT 131515 Jm A 0 1 TY ur 3117153 15 7302 ENSIS TM JACK itl LENE 2 13 5 Hz1NIJ h HO 35 HOON M aa IE 1 TTE or P E Hille WMH l 05 X 38 45 9 air E Ee Tel Z nb ddd 3 EW dL BASSE A EIHL e mx NO LLJ3r Cea Q 10 20 09 tap 5 ey ag
9. L L 73 M bi Figure 5 A simple diffractometer From equations 1 and 2 10 h T t 2 2d sin 6 Where Lis the total flight path L L t is the total flight time t4 t and d represents the set of d spacings measured ht ds 5 2MyL 0 7 2 Peforming an experiment on IRIS 2 1 Before arriving at IRIS There are a number of administrative procedures that MUST be followed before arriving at the spectrometer Failure to do so WILL delay the start of the experiment 2 1 1 The User Office film badges and swipe cards Once at ISIS the User should proceed directly to the User Office UO in R3 Room G11 to register his her arrival First time Users will be given an information pack detailing all safety aspects at the facility To obtain wireless internet access in R5 5 please ask the UO for a username and password The User will also be required to watch the ISIS Safety Video Once registration is complete the User will then be directed to the ISIS Main Control room MCR in R5 5 to gain access to the experimental hall Outside office hours the MCR will hand out safety information but at the earliest available opportunity arrival should be registered at the UO 2 1 2 Sample Experimental Risk Assessment ERA As part of the beam time application procedure the Principal Proposer will have submitted details concerning the chemical constitution of the sample s to be studied This information is used to p
10. Time Beam Logger ary date Spectrum q 1 Period j 1 Jj Counts es Integral lo Max 0 00 D 9 E lt 107 1 1 2 80000 0 90000 0 100000 0 110000 Shortcut to Time RB1010337 Plot 0 Amplitude Integral lo Max 0 00 Plot O 1 07 0 5 1 0 4 1 1 80000 0 100000 0 110000 I 90000 0 Time Figure 7 The IRIS SECI interface Sample Environment Eurotherm Rotation Beamline Analyser Temps LEEP interrupted with seconds remaining Choppers gt gt change title End of cycle Pressures gt gt begin H Data Collection DAE roposal No 1616146 by Telling Dr MT F User Details un 47641 BEGINs 16 Aug 2010 9 0 Sample Details gt gt end Beamline Details un 47641 ENDed 16 Aug 2018 99 34 29 01808 v Scripting Logging 44 change title Beginning of LONG SHUTDOWN gin Dashboard Journal o Error Reporting Report Bug gt gt Machine Status Beam Status MCR News Beam Logger o IRIS gt gt change user un BEGINs 16 fiug 2018 09 34 46 0 en un 47642 ENDed 16 Aug 2010 09 34 53 0100 gt gt load u s mark S0D2 Aug 10 JL renum UURITFOR URMPS Converting supplied Uf MPS parameter into a Rea The following details vill be used to determine ownership of the data file Xlocal contact UNKNOWN gt The following details vill be used to determine ownership of the data file roposal
11. and visualise QENS Inelastic data using function fitting routines MODES is used to convert the RAW or IPG etc data to a DASC format that can be read by PAN in DAVE It also contains the IDL version of MSLICE Information about DAVE can be found at htto www ncnr nist gov dave 25 4 References i The design of the IRIS inelastic neutron spectrometer and improvements to its analyser C J Carlile and M A Adams Physica B 182 1992 pp 431 440 ii The MODES User Guide v3 W S Howells V Garcia Sakai F Demmel M T F one and F Fernandez Alonso Feb 2010 yep 26 APPENDIX I Quasi In elastic Settings Analyser reflection RO UN Energy a TCB s FWHM at indo AE Chopper Computer uS Detector Monitor Regi 2 elastic line freq Hz command 06 3 TCB s us ROME TCB s us ueV 010 us intensity ae REL REL os se a s s 5 s 5 es E E relative flux meV s s sono oat 72000 3 2 Please check with instrument scientist these are not standard settings and should be used with care only for some specific cases No Beryllium filter required collimator needed ask Instrument Scientist 27 APPENDIX Diffraction Settings d spacing Detector TCB s Monitor TCB s TCB monitor Phases HS Computer range A us us min 06 3 010 command E p 8 30 to 9 90 151000 191000 171000 173000 143000 0 24722 150 drange 7 NB include the string
12. may be possible with the assistance of Radiation Protection 6696 to package an active sample in such a way as to make its removal from ISIS safe Before leaving all film badges and swipe cards should be returned to the MCR Permissible dose rates can be found in Appendix V 3 IRIS Computing 3 1 Instrument Control 3 1 1 Data Acquisition Electronics DAE During the course of a run data is accumulated in the Data Acquisition Electronics DAE in a number of spectra each spectrum corresponding to a particular detector Each of these spectra contains a histogram of neutron counts versus time of flight At the end of the run the contents of the DAE are automatically copied to a file called IRS RAW where is a five figure run number incremented automatically at the end of each run Shortly after creation this RAW file is copied onto the analysis PC The DAE has four possible states SETUP Data not collected Instrument parameters may be changed RUNNING Data is currently being collected and stored in the DAE PAUSED Data collection is temporarily suspended by the User WAITING Data collection is temporarily suspended for example when a cryostat temperature is outside defined limits The current DAE mode and run status are displayed on the Dashboard 20 3 1 2 Instrument control commands The Instrument Control PC is used mainly to start and stop data collection but also allows data collection to be suspended tempo
13. of the sample by loosening the collar on the sample stick moving the stick and retightening the collar Using the long stick most common on IRIS TLCCR the distance from bottom of sample stick flange to center of beam is 1168mm 3 Make sure that the 3 way valve is either open to vaccum or in the closed position perpendicular to the He vacuum line Ensure that there is some He gas pressure in the cylinder supply gauge and float are on the panel to the left of the IRIS sample bench Make sure that all cables are disconnected from the sample stick 4 Unscrew the sample stick or sample space cover from the flange of the TLCCR 51 5 6 7 8 9 Open the 2 way valve to He inlet Ensure you keep q continuous flow of He through the sample space to prevent air from entering which may lead to moisture freezing at the bottom of the sample space Remove the sample stick or cover from the TLCCR once the He pressure gauges read atm and insert the new sample stick Screw the sample stick or cover and pump the sample space by turning the 2 way valve to vacuum Attach the temperature cable onto the new sample stick and verify on the IRIS control computer that all temperatures are reading as expected Pump and purge the sample space three times by filling the well with helium to 1atm and then pumping it out Make sure not to over pressurise the sample space 10 For measurements at a 3 5 lt T K lt 320 leave around 30mbar of He i
14. the atoms in the sample and t is the thickness of the sample For example for a transmission of 85 scattering of 15 ignoring absorption processes then 1 t 1n 0 85 no More specifically for polyatomic samples no n o n o n 0 However in many cases all atoms bar hydrogen may be ignored since H has by far the largest incoherent scattering cross section Flat can cross sectional dimension mm Table 1 Volume required for flat cans If you have a 10 scatterer the probability of scattering is p 0 1 and that of a second scattering will be p 0 01 12 Flat plate sample cans are sealed using either indium low temperature work less than 400K or O rings high temperature work and may be used for liquids as well as powders The advantage of using such cans is that the design specifically incorporates holes for cartridge heaters and temperature sensors enabling quick temperature changes and fine control However since the heaters and sensors have to be shielded using cadmium at T lt 400K or Gadolinium foil at T gt 400K scattering in the plane of the sample will be greatly reduced and so sample orientation is important In general the sample can is oriented at 45 relative to the incident neutron beam straight through is 0 exact back scattering is 180 with angles on the graphite side of the instrument defined as being positive and the angles on the mica side are negative Which sample can orientation
15. title SrYb204 hkO as_string angle_mod Deg 002_off4 pg002 4 waitfor seconds 60 begin waitfor uamps 300 end waitfor seconds 3 ENDLOOP ENDPROCEDURE Example 5 Quiet count run before cycle start up PROCEDURE quiet LOCAL i QUIET CONFIG change title Quiet counts b4 10 2 Anal cooling LOOP i FROM 1 TO 100 begin waitfor seconds 21600 end ENDLOOP ENDPROCEDURE 49 Example 6 Diffraction calibration with NaCAIF PROCEDURE nacalf drange 1 waitfor seconds 10 change title 10 1 d1 Nacalf begin waitfor uamps 25 0 end drange 2 waitfor seconds 10 change title 10 1 d2 Nacalf begin waitfor uamps 25 0 end drange 3 waitfor seconds 10 change title 10 1 d3 Nacalf begin waitfor uamps 50 0 end drange 4 waitfor seconds 10 change title 10 1 d4 Nacalf begin waitfor uamps 50 0 end H ENDPROCEDURE 50 APPENDIX X Operation of TLCCR Changing sample po supply e d Loading and changing sample NB Estimated cooling time from RT to base 3 5K is approx 3 hrs 1 Select appropriate sample stick for your experiment a For3 5 lt T K lt 320 use cold stick which should have a fixed RhFe sensor Extra sensor RhFe and heater can be added onto the sample b For 325 lt T K gt 600 use a hot stick which has a copper mount with a built in Pt temperature sensor Ask local contact to provide you a set of radiation heat shields 2 Adjust the vertical position
16. No 1616146 by Telling Dr M T F local contact UNKNOWN gt Figure 8 Open Genie Command window 17 2 7 IRIS Data Collection 2 7 1 BEGIN To start a run type BEGIN in the Open Genie window After a few seconds the Dashboard should indicate IRIS RUNNING and the total number of micro amps and the monitor counts will begin to increment 2 7 2 Inspecting data To inspect a data set while it is still being collected use the visualisation graphics on the DAE control In the DAE window see Figure 7 choose the Run Diagnostics tab Select the detectors to plot eg 1 for incident beam monitor 2 for transmitted beam monitor 20 for a PG detector and 80 for a Mica detector Visualisation and simple manipulation of spectra is also permissible by entering OPENGENIE commands in the active Open Genie window It is not advisable to perform full data analysis procedures on the instrument control PC Alternatively the user can enter UPDATESTORE in the OpenGenie window This command copies the contents of the DAE to a file IRS S number where run number and number is incremented each time UPDATESTORE is issued during a measurement and a IRS SAV file The files are copied to the IRIS analysis PC SAV and RAW files which are copied to the analysis PC RAW is copied once a run is ended can be analysed in greater detail using MODES MSLICE DAVE see section 3 2 2 7 3 END Once the data collected
17. The IRIS User Guide 3 Edition Neutrons from Cryostat 6 5 m disc chopper target 10 0 m disc chopper Curved glass guide Diffraction detectors Sample can Mica analyser bank Converging Detector bank supermirror mica analysed quide Incident beam Transmitted beam monitor monitor M e Graphite analyser bank Detector bank graphite analysed V Garc a Sakai M A Adams W S Howells M T F Telling F Demmel and F Fernandez Alonso Quasielastic Neutron Scattering Section Molecular Spectroscopy Group ISIS Pulsed Neutron and Muon Source Rutherford Appleton Laboratory Chilton Didcot OX11 OQX September 2010 PREFACE This User guide contains all the information necessary to perform a successful neutron scattering experiment on the IRIS high resolution inelastic spectrometer at ISIS RAL UK Since IRIS is a continually evolving and improving instrument some information contained within this manual may become redundant However the basic instrument operating procedures should remain essentially unchanged While updated manuals will be produced when appropriate the most comprehensive source of information concerning IRIS is the Instrument Scientist Local Contact ACKNOWLEDGEMENTS It is a pleasure to acknowledge all those who have contributed to the production of this User guide This includes Miss Roulin Wang who helped with the production of this 3 Ed and Arthur Lovell for pro
18. VI Out of hours support Normal working hours for most ISIS staff apart from the ISIS crew who are on shift duty are from 08 30 to 17 00 Mon to Fri Outside these hours most local contacts at ISIS including many members of the technical support groups can provide some form of out of hours User support upon mutual agreement wit them The first point of call after this manual should be the Local Contact for the experiment Unless it has been agreed that a person may be contacted outside of these hours then the following procedure should be adopted i Check the manual for possible solutions and explanations ii Investigate whether the problem can be put off until a more reasonable time e g can the experimental timetable can be adjusted by perhaps performing a background or a resolution measurement ili Isa member of the ISIS crew able to assist with the problem iV If none of the above apply ensure that the experimental set up is safe the ISIS duty officer in the MCR will advise if necessary and wait until a more reasonable time Loss of beam time due to ISIS IRIS Sample Environment problems is always dealt with sympathetically and if appropriate the lost beam time will be is rescheduled at a later date 36 APPENDIX VII Useful telephone numbers General Accident Emergency Fire 2222 Health Physics 6696 ISIS Main Control Room MCR 6789 ISIS Cabin 6836 Main Gate security 5545 Computer support 1763 Instrument Scienti
19. analysed by means of Bragg scattering from a crystal analyser array In common with other instruments at a pulsed neutron source the time of flight technique is used for data analysis The instrument sharing the N6 beam line at ISIS with its brother instrument OSIRIS views a liquid hydrogen moderator cooled to 25 K and consequently has access to a large flux of long wavelength cold neutrons For the purpose of this description IRIS may be considered as consisting of two parts i The Primary Spectrometer Beam Transport The primary spectrometer is illustrated below in Figure 1 Neutron beam transport from the moderator to the sample position is achieved using a neutron guide While the majority of the guide section consists of accurately aligned nickel plated glass tubes approx 1m long and rectangular in cross section it is terminated by a 2 5m long converging nickel titanium supermirror The supermirror component not only helps focus the beam at the sample position 32 mm high x 21 mm wide but also serves to increase incident flux by a factor of 2 9 at 5 The incident neutron flux at the sample position is approximately 5 0 x 10 n cm s white beam at full ISIS intensity with the wavelength intensity distribution at the sample position up to 18 being illustrated in Figure 2 Note however that the flux at longer wavelengths is still sufficient to use wavelengths up to 20 Mica002 configuration In practice th
20. ata files OR DISPLAY O Windows explorer links to cycle folders links only work from ISIS network OR TRANSFER to VMS cluster ISISA HATHOR THOTH files placed in directory SCRATCHSDISK ISISDATA and automatically removed after 1 week Processed Data File Access e g GEM Xpress access This form gives you access to processed data created at ISIS following e g a GEM Xpress experiment You need to supply the proposal number of the experiment leaving out any RB or XB prefix and the name of the instrument used The processed data index was last rebuilt at 10 45 Tuesday 17 August BST files added after this time will not yet be available for download mamaa Done J Local intranet 10090 v Figure 9 Raw data file access 2 7 4 End of the experiment Once the beam has been turned off remove the sample stick sample from the sample environment equipment and place in the lead castle on the IRIS bench Before removing the sample from the stick ensure the following NOTE that these guidelines apply to samples contained in standard IRIS OSIRIS Aluminium cells both annular and flat 1 Check dose rate using the instrument radiation monitors 2 If dose rate at a distance of 10cm with the probe s cap off is 75uSv hr then wait at least 3 hours to handle the sample 3 If dose rate at a distance of 10cm with the probe s cap off is lt 75uSv hr standing at a distance of at least 50cm from the sample and using long nosed pliers t
21. dN in the run title For example Aluminium d4 Room Temperature 28 APPENDIX III Instrument Parameters Operating vacuum 3 5 x 10 mbar instrument tank 1x10 mbar sample environment bin Primary flight path L 36 41m Inelastic Secondary flight path L 1 45m Angular coverage of ZnS detector banks 25 20 lt 158 Analysing energies meV PGOO2 1 845 MI002 0 207 PG004 7 381 Mi004 0 826 Mi006 1 857 NB with fluorinated mica the Mi004 reflection is not available Spectra Number PG side S3 S53 Mica side S54 S104 Diffraction Angular range of diffraction detectors 167 1 lt 28 lt 172 4 Spectra Number Mode Purely Diffraction Inelastic m Angle S3 S105 0 85757 167 1521 S4 S106 0 85025 167 7229 S5 S107 0 85701 168 3302 S6 S108 0 84987 168 9085 S7 S109 0 85682 169 5041 S8 S110 0 84987 170 0883 S9 S111 0 85701 170 6707 S10 S112 0 85025 171 2588 29 10 19 40 12426 1668 3337 44 13476 1742 3484 46 1400 1773 354 48 14526 181 362 a 9 44599 184 3027 30 Q values at elastic line for GRAPHITE analyser reflections 4 00 3 50 3 00 Graphite 004 250 Graphite 002 c lt 200 4 2 0 1 50 1 00 0 50 0 00 I 1 1 l 1 13 18 23 28 33 38 43 48 spectrum number 31 53 Spectrum 20 degrees Mica006 Mica004 Mica002 0 356 0 238 0
22. e environment apparatus into and out of the beam line 2 4 The Beam Line Shutter Interlock System The IRIS beam line shutter interlock system is comprised of two coupled electronic mechanical control systems one to control the main shutter and which consequently affects both the IRIS and OSIRIS beam lines N6A and N6B and the other associated with only the IRIS intermediate shutter There are very few occasions when it is necessary to open close the main shutter and this should ONLY be done under the supervision of the Local Contact For information main shutter controls can be found both inside and outside the IRIS cabin The User may however operate the intermediate shutter control system after suitable instruction The intermediate shutter control system found on the instrument platform consists of three boxes shutter control A key and master key and a set of interlock keys a master key N6A M and three A keys labelled N6A A with corresponding locks The Local Contact will point out the location of these boxes and demonstrate how the interlock system operates However to summarise the intermediate shutter cannot be opened unless all four keys are in their appropriate locks in the correct control boxes Inserting and turning clockwise all the A keys in the A key box releases the master key N6A M The master key can then be inserted into the lock in the side of the master key box Once in position and turned
23. e wavelength distribution illustrated above bears little resemblance to that observed in the incident beam monitor during an actual IRIS experiment After leaving the moderator and depending upon incident energy each neutron either passes or is absorbed by one of two disc choppers In brief the two choppers are used to define the range of neutron wavelengths incident upon the sample during the experiment Located at 6 3m and 10m from the moderator respectively and operating at either 50 25 16 6 or 10 Hz the choppers themselves are constructed from neutron absorbing material bar a small adjustable aperture through which neutrons may pass The lower and upper limits of the incident wavelength band are therefore defined by adjusting the chopper phases and hence opening times of each aperture with respect to t the moment at which neutrons are produced in the target Wavelength band selection effectively defines the energy resolution and energy transfer range inelastic or d spacing range elastic covered during an experiment Both choppers are synchronised to the ISIS operating frequency 50Hz with the purpose of the 10m chopper being to avoid potentially problematic frame overlap Disc choppers ID 50Hz Ni Ti s upermirror puide imscri Converging Ni Ti Supermirror Guide gt n a Gam x29ua S A A N Ba ta SM z N AANA j AR Sample C i unm N 5 55mm Pa
24. er reflection and hence resolution and energy transfer range is achieved by defining 15 a the frequency and phases time delay settings relative to t of the two disc choppers and b the time channel boundaries TCBs for data acquisition The procedure is the same for selecting a particular d spacing range when simply using the instrument as a diffractometer Standard instrument settings can be found in Appendices and along with corresponding chopper frequencies and phases These settings are loaded by typing single word commands also given in Appendices and Il in the active OpenGenie window However occasion may arise when the nature of the problem under investigation warrants modified setting i e the standard settings are inappropriate because of the presence of spurious peaks In this case seek advice from the Local Contact 2 6 IRIS Computing Summary IRIS is controlled using a PC running LabView based instrument and sample environment control software referred to as SECI Sample Environment and Control Interface The basic components of SECI are shown in Figure 7 In addition there is a PC available for data analysis and visualization RAW data files are copied to this PC once a measurement has ended files are copied to c irisdata on the Analysis PC The SECI system can be configured to start only those sample environment and or instrument control components for example chopper cryomagnet dilution re
25. erform a sample safety assessment and subsequently generate a Experimental Risk Assesement ERA detailing possible chemical or radiological hazards associated with the material Recommended handling procedures after irradiation are also listed and MUST be followed Before beginning the experiment the User and Local Contact should make sure that it is displayed in the pocket beside the sample environment enclosure for the entire duration of the experiment The User should have also watched the ISIS Safety Video 11 2 2 Selecting sample cans and sample geometry Sample can selection is usually determined by the form of the sample and or the sample environment equipment to be used Two geometries are available Note that IRIS and OSIRIS share their sample cells 2 2 1 Flat plate cans The flat plate cans used on IRIS are made of aluminium and allow for a sample with cross sectional areas w x h 40 x 50 mm and 26 x 50 mm and of variable thickness t The thickness itself is governed by the sample s ability to scatter neutrons a 10 15 scatterer is the ideal since multiple scattering is in general not a problem at this level The optimal thickness of the sample can be roughly calculated using Beer Lambert s Law I exp not gt t n 7 0 10 Where lo is the incident intensity is the transmitted intensity n is the number of scattering atoms per unit volume o is the average scattering cross section for
26. es the run RESUME Resumes the run from pause state ABORT Aborts the run and DOES NOT save the data CSHOW sample block name Gives the current value of the block eg sample CSET CONTROL sample 35 lowlimit 30 highlimit 40 45 Sets the sample to 35 Data will not be acquired unless the sample value is between 30 and 40 CSET NOCONTROL sample 35 Sets the sample to 35 Data will be collected without any constraints on sample Command files or control scripts can be run from an Open GENIE window on the instrument computer A script is basically a compiled Open GENIE procedure which is executed in the window A procedure can be loaded in one of two ways depending on how it is written 1 You can write a standard PROCEDURE ENDPORCEDURE program in which case you use the LOAD or INCLUDE command 2 You write a section of one line commands in which you use the loadscript command The LOADSCRIPT command will take the command wrap them in a PROCEDURE ENDPORCEDURE with the procedure name the same as the filename passed to LOADSCRIPT Whichever you use you will get a command which you can type to begin running the file Note do not create a variable with the same name as a block COMMAND FILE EXAMPLES Example 1 QENS run with no temperature control PROCEDURE osiris pg002 16Hz waitfor seconds 20 cset nocontrol OX Cryostat 295 change title Van in Cyl cell OSIRIS Be 002off begin waitfor
27. eters PID Parameters Reference Dose Rates Out of hours support Useful telephone numbers Sample can information Command line scripting Operation of TLCCR Changing sample 26 2 28 29 34 35 36 37 38 45 51 1 Introduction This User guide contains all the information necessary to perform a successful neutron scattering experiment on the IRIS high resolution quasi in elastic spectrometer at the ISIS Facility RAL UK However to ensure it is as concise as possible other manuals and reports are referenced for specific details Copies of all reference material are available in the instrument cabin and on the instrument website http www isis stfc ac uk instruments iris Your Local Contact is also available for assistance and discussion regarding the precise details of the experiment This first section addresses the basic underlying physics of IRIS operating as a high resolution quasi in elastic spectrometer and as a high resolution long wavelength diffractometer Section 2 Performing an experiment on IRIS details a typical experimental procedure in a stepwise manner Finally Section 3 discusses computer control as well as data analysis and visualisation 1 1 The Instrument IRIS is a high resolution quasi in elastic neutron scattering spectrometer with high resolution long wavelength diffraction capabilities It is an inverted or indirect geometry spectrometer such that neutrons scattered by the sample are energy
28. f positive angles will work for the mica reflections 002 004 006 but only the mica 006 reflection will enable the simultaneous use of the graphite analyser 2 2 2 Annular Cylindrical cans The cylindrical sample cans used on IRIS are made of aluminium and are 55mm high by 24mm in diameter o d of outer can For thin samples 0 5 to 2 mm a hollow cylindrical insert may be placed inside resulting in an annular cross section as viewed from above The advantage of this sample geometry is that unlike the flat plate cans there are no edge effects and potentially problematic multiple scattering effects are reduced In addition sample can orientation is unimportant unless heaters and temperature sensors have been attached without heaters sensors there are no blind spots on the analysers 13 timm idimm o d mm vol em _ Table 2 Volume required for annular cans 2 3 Loading a sample into the neutron beam Most experiments on IRIS utilise the top loading closed cycle refrigerator TLCCR The Local Contact will go through the operation of the TLCCR and sample loading procedure Quick operation guide is given in Appendix X However should different sample environment equipment be requested e g an orange cryostat or furnace the Local Contact will provide additional guidelines on their proper use Note only personnel with a crane operator s licence see Dennis Abbley for details x 5455 are permitted to crane sampl
29. frigerator control software needed for individual experiments Those instrument sample environment components that are active are listed on the left hand side of the SECI window The status of the instrument and details about the experiment is displayed on the Dashboard found at the top of the screen This displays information about the current run RUNNING SETUP run title and run number In addition information concerning the User run time frame proton pulse count present and accumulated proton beam current incident beam monitor counts and any sample environment parameters being monitored are also displayed As mentioned above single command words see Appendices are used to load the different parameters for different instrument settings in the Open Genie Command window see figure 8 Consequently all that is required of the User is to enter an appropriate title User names and experiment RB number No other input is necessary although information such as type of sample can orientation and scattering geometry can also be stored During the course of an experiment some simple alterations can be made without aborting or ending a measurement These can be typed into the active Open Genie window or issued from a command file regardless of the state of the DAE For example the following alters the title of the current experiment CHANGE TITLE An IRIS experiment CR 16 DASHBOARD ISIS Sample Environment Control In
30. is of sufficient quality for subsequent detailed analysis typing END will stop the run and store the data The data is automatically archived and copied to the IRIS analysis PC as a IRS RAW file The user should take the data with him her or alternatively may download their data when back at their institution from the following site see figure 9 http data isis rl ac uk If prompted for a username and password please enter your fed id password Alternatively ask the Instrument Scientist Local Contact 18 gt ISIS Data Access Microsoft Internet Explorer provided by STFC e e http data isis rl ac uk v i x IE File Edit view Favorites Tools Help Google v SP search f amp wm Share Bh Sidewiki YY Bookmarks 2 Check Sal Translate E AutoFill 4 amp sign In gt P gt w lt 44 1515 Data Access 6 dh Ge M ISIS PC Controlled Instrument Data File Access This page allows you to access data files created on ISIS instruments Once you have entered details of the run numbers of the files you require you will be redirected to a secure connection where e You will need to reply Yes to the question of do you want to accept a certificate e When prompted you will need to enter a username and password that was issued to you at ISIS you may use either a Federal ID or VMS account If you do not have an account you should contact the ISIS User Office isis
31. n the sample space Close the 2 way valve b 325 lt T K lt 600 leave the sample space continuously pumping Leave 2 way valve open to vacuum No need to perform step 9 Always leave the temperature of the CCR at 298K 52
32. ng settings in both choppers start with the 6m While settings are changing the green lights will turn dark once choppers are ready they will turn to light green 3 1 4 SECI and Eurotherm The temperature of the sample and or sample environment equipment not only temperature but also magnetic field pressure can be set as well as logged from the instrument control PC and any computer terminal connected to the IRIS control PC using a VNC connection This is achieved via SECI Each time an IRIS run is ended all log files are closed and new ones are opened The log files follow the convention IRS block name gt TXT where is the run number The blocks include isis frequency Sample TLCCR for example They can be identified in the top right box of the Dashboard The log files are written to the IRIS analysis PC along with the RAW file In addition to the RAW and SAV files the file JOURNAL TXT is also copied to the analysis PC JOURNAL TXT contains a list Date Run No Users Title Run Duration and Number of uamps of all IRIS experiments performed to date The journal file can also be accessed on the dashboard Sample Environment CryoMagnet i EurothermController vi Neocera Beamline V Analyser Temps 1 26 Warning Changes may take a few seconds to come into effect Log to file J 10 sec O en Choppers 3 i 5 Graph Buffer Size 1000 Pressures Main Page Multiplot Activity J P 7
33. o avoid direct contact remove the sample from the centre stick Place sample in the instrument s lead castle and sign post with a warning of presence of radioactive material 4 If dose rate is lt O 1uSv hr remove sample without any further instructions 19 These recommendations apply also for changing samples Whenever possible have two sample sticks available Ask the Local Contact Before the User removes any sample from ISIS he she MUST have all irradiated samples monitored for induced radioactivity Assistance and advice in this matter may be sought from the Local Contact ISIS Health Physics Office 6696 or the ISIS Main Control Room 6789 If the sample is not active it should be removed from its can the can cleaned ready for the next User and the sample dealt with according to the sample ERA i e stored at ISIS removed from ISIS or disposed of by ISIS staff If removal of the sample from ISIS is required but not immediately possible due to the level of induced activity arrangements should be made with the Local Contact to remove it at the earliest available opportunity All active samples should be stored in the Active Sample cupboard and MUST be logged on storage and out upon removal in the logbook located inside the cupboard It is not guaranteed that samples will remain stored at ISIS indefinitely so do not forget do leave your e mail address so that we can contact you when the sample is safe for you to take it back It
34. oftware A brief description of the four main software packages and links to further information is given below DO NOT use the IRIS control PC for data analysis OPENGENIE OPENGENIE is an ISIS developed data visualisation package common to all ISIS instruments It is used for displaying and manipulating spectra and data sets A comprehensive overview of OPENGENIE can be found at http www opengenie org Main Page 24 To start OPENGENIE click on the OPENGENIE icon on the analysis PC desktop Useful data visualisation commands include Open GENIE Description Open GENIE Description Command Command d h l m e Display mySdisk set dir 0 M set directory mydir w1 title set title dat O om keep hardcopy show defaults Rebin MODES MODES is a suite of programs for the full reduction and analysis of IRIS and OSIRIS data More information on MODES can be found at http www isis stfc ac uk instruments iris data analvsis sotware for iris osiris data analysis4697 html MSLICE MSLICE is a MatLab based analysis tool predominately used for the visualisation and analysis of magnetic excitations MODES is used to convert the RAW or IPG etc data to an SPE format that can be read by MSLICE Information about MSLICE can be found at http mslice isis rl ac uk Main Page DAVE DAVE is an IDL based analysis tool developed at the NIST Center for Neutron Research USA It can be used to analyse
35. or banks and a diffraction detector bank at 28 170 containing ten He gas tubes Incident and transmitted beam monitors are also located before and after the sample position respectively The pyrolytic graphite analyser bank is cooled to 10K to reduce background contributions from thermal diffuse scattering 1 2 Principle of Operation 1 2 1 Quasi In elastic Neutron Scattering During quasi in elastic neutron scattering experiments the scattered neutrons are energy analysed by means of Bragg scattering from a large array of single crystals Pyrolytic Graphite or Mica Only those neutrons with the appropriate wavelength energy to satisfy the Bragg condition are directed towards the detector bank By recording the time of arrival of each analysed neutron in a detector relative to t energy gain loss processes occurring within the sample may be investigated The quasi in elastic scattering process can be summarised mathematically as follows Li gt gt L GD Figure 4 An indirect geometry inelastic neutron scattering spectrometer Li The two disc choppers are used define the finite range of neutron energies incident upon the sample S Ec mpv and p m v de Broglie 1 where m_ is the mass of the neutron Consequently the time of flight t of each neutron along the primary flight path L is variable However since only those neutrons with a final energy E that satisfies the Bragg condition A
36. rarily to allow for example entry into an interlocked area Commonly used instrument control commands include BEGIN Clears the DAE memory sets parameters in the DAE to those specified instructs the DAE to start data collection Sets DAE state to RUNNING on the dashboard PAUSE Suspends data collection by the DAE Sets DAE state to PAUSED RESUME Resumes data collection by the DAE Sets DAE state to RUNNING UPDATESTORE The contents of the DAE are written to the file IRS S number where run number and number is incremented each time UPDATESTORE is issued during a measurement SETUP to file IRS RAW The ABORT command does not store the accumulated data and so should only be used if it is certain that the data is not needed These commands can be given through the Open Genie command window or through the dae control VI Sample Environment CryoMagnet Eurotherm Meocera Beamline Analyser Temps Pressures Data Collection Beamline Details journal Sample Details User Details Scripting Logging 3 Dashboard Error Reporting Report Bug Enter Frequency Enter Frequency 8573 114250 7 so EE Figure 10 The Chopper control window 21 3 1 3 Chopper Control Having decided upon the appropriate spectrometer configuration the User may need to set suitable chopper frequencies and phases This can be done with the Chopper window If changi
37. re at a specified set point using a 3 term control algorithm proportional band integral time and derivative time commonly referred to as PID control The conversion from millivolts to K or C is achieved using look up tables held on the data acquisition PC each Rh Fe sensor for example is calibrated at a number of points and has its own conversion table and identification number While the unit of temperature K or C depends upon the sample environment equipment being used it would normally be Kelvin for a cryostat and Celsius for a furnace The Eurotherm window displays both the millivolt readings and the corresponding K or C value 3 1 5 Temperature control Listed below are the more useful commands in the SECI relating to the control of temperature The controls are entered in the active Open Genie window CSET Sample 10 Sets temperature observed temperature control block Sample to 10 K CSHOW Sample Displays information about the current status of Sample CSET CONTROL Sample 15 LOWLIMIT 10 HIGHLIMIT 20 This command issues a set point value of 15 K or C to temperature control block Sample The controller attempts to maintain a temperature of 15 5 K or C as denoted by the limits LOWLIMIT and HIGHLIMIT are used to inhibit data collection because of the CONTROL prompt If Sample varies outside this range IRIS goes into the WAITING state until the value returns into the range CSET NOCONTROL Sample
38. sts Local Contacts Most members of the Molecular Spectroscopy Group are familiar with the operation of IRIS As a first point of contact the following ISIS scientists will be able to address your needs Office Mobile Short code Victoria Garcia Sakai 6703 07786 395 315 1934 Franz Demmel 8283 07909 815 349 1326 Felix Fernandez Alonso 8203 07775 817 006 1220 37 APPENDIX VIII Sample can information Adaptors for mounting Indium wire to seal can CNN Temperature N sensor RhFe ACCESORIES 38 CYLINDRICAL CELLS 00 880 800F NS3HNOSIANS 3 IAWYS JA34 IS esl iB MET NH3HINOS NI1 NI ONS 3 dJd O BE NO O39 d5 INO OHHL EH dVl B l Ti o MV TINNY 31111 NO 3 awa Ines EBBB 5 B DI ONL SIBI F3 2 amp NOT 13 WJS LON 00 i a IIS Q31Y15 SEJNA AL 158 AQT TY at 3anix3i TAS ASAS 2101718 TW 3 03 L OF SHLD 3 NSOd Z XV 5 H Ny3 13 c 0 N39 H5INIJ O31v15 55390 5328783101 c a e OD OD c e I un x JAOO89 HATO v 00 880 800F 15 E V 39 600 72B80 800Fr IS INJHNOHIANd 3 3 5 O C 3833 1 31111 E o650 300k NO NHIHINOS P AONFO E 03d O BE NO 03295 1103 0 8885 5 18 OL 5 38 0 BNIMYHO SIHI E TIO B 31 1 NOTI 3 WJS LON OU LF JWIS 131 15 SSM
39. terface Version SECI2 1 3 16 16104 SECICOM 1 1 18 18622 File Configuration Options Help IRIS IS SETUP Beginning of LONG SHUTDOWN RUN NUMBER 47643 17 08 2010 10 30 19 RBNumber 1010146 Ej Config Name TLCCR Logged in as User i gt dae control vi Sample Environment Eurotherm Rotation Beamline Analyser Temps Choppers Pressures Data Collection User Details Sample Details Beamline Details Max Jo 00 Integral 0 1 0 o in D Seripting Logging Dashboard E 0 0 Journal 3 pen GENIE mad E Error Reporting Report Bug 1 Machine Status 1 D 80000 0 90000 0 100000 0 Beam Status MCR News Time Run Summary Experiment Setup Run Information Run Diagnostics Plot User IRIS Phone Start Mon 16 Aug 2010 09 34 46 Beam Curr Tot 0 0 RunTime Tot 00 00 05 DAETimeSrc SMP 110000 Integral lo Max 0 00 Amplitude OSIRIS Magnet False isisfreq Hz Stick OK Good Total 0 Raw Total 0 KBytes Used 8 Mon From To 94000 960 Mon Counts 0 Mon Spectrum 1 Total Counts 0 CountRate 0 Channels 2000 Spectra 114 phase6 13951 ps phase10 2341 us freq6 0 Hz freq10 0 Hz Analyser_T1 175 99 K Tank_P 7 9E 06 mbar Run Diagnostics 2 Vetos Dashboard Options Plot 0 DAE 1 0 4 1 1 80000 0 90000 0 100000 0 110000
40. the intermediate shutter can be opened by pressing the open button on the shutter control box 14 Upon pressing open the master key is locked into position and cannot be removed until the intermediate shutter is closed In principle this means that all active areas on the IRIS beam line are inaccessible while the intermediate shutter is open The area underneath the instrument platform for which access is necessary for some instrument configurations is only accessible when the main shutter has closed Entry into this area is only allowed for the Local Contact Regaining access to an interlocked area e g the sample environment enclosure requires reversal of procedure outlined above The shutter is closed the master key is removed and inserted into the A key box which subsequently releases all three of the A keys for access to interlocked areas Master key to reen box 5 Keysto open sample cage ISIS off button To be used ONLY in case of emergency Figure 6 nterlock system 2 5 Suitable instrument settings IRIS is easily configured to match the scientific problem under investigation In brief it is simply a matter of selecting an appropriate resolution and energy transfer range or in the case of diffraction the appropriate d spacing range s For quasi in elastic scattering experiments different resolutions are associated with the different analyser reflections available Selecting a particular analys
41. to use depends specifically upon the Q range and energy resolution required for the experiment Cases to consider are i High Q If high Q values are required then reflection geometry is best e g plane of sample at 45 such that the blind spot occurs at low angles Note that if the graphite analyser is being viewed using this scattering geometry then data may also be collected from the low Q analysers and detectors on the mica side of the instrument providing that the back of the sample is not shielded with cadmium This is possible because both the graphite 002 and mica 006 reflections make use of the same wavelength band If both Q ranges are not required then shielding the back of the sample with cadmium will reduce background scattering from the Sample environment li Low Q If low Q values are required then transmission geometry should be employed A sample orientation of 135 is ideal for some magnetic scattering experiments in which the graphite 004 reflection is used for its larger energy transfer range in order to optimise the scattering on the lowest possible Q values where the magnetic scattering is strongest This scattering geometry will also give a better diffraction pattern because of the position of the diffraction detector on the mica side of the instrument It should also be noted that spurious signals due to Bragg scattering would be reduced at low angles ili Both the above sample orientations with negative instead o
42. uamps 60 end begin waitfor uamps 60 end ENDPROCEDURE 46 Example 2 Elastic window scan from base T to T gt 325 and subsequent QENS measurement PROCEDURE elwin GLOBAL itemp high low pg002 waitfor seconds 20 temp 240 LOOP i FROM 1 TO 27 temp temp 10 high temp 2 low temp 2 cset control Sample temp highlimit high lowlimit low cset nocontrol TLCCR temp 268 change title d3PSC0p4 T as string temp C PGOO2 waitfor seconds 120 begin waitfor uamps 10 end ENDLOOP pg002 waitfor seconds 20 temp 30 LOOP iFROM 1 TO 30 temp temp 5 high temp 2 low temp 2 cset control Sample temp highlimit high lowlimit low cset nocontrol TLCCR 300 change title d3PSC0p4 T as string temp C PGOO2 waitfor seconds 120 47 begin waitfor uamps 10 end ENDLOOP pg002 waitfor seconds 60 temp 177 cset control Sample temp highlimit temp 2 lowlimit temp 2 cset nocontrol TLCCR 298 change title d3PSC0p4 T as_string temp C 002 begin waitfor uamps 600 end END PROCEDURE Example 3 Simple loop counts PROCEDURE muamps PARAMETERS mmamps real LOCAL i begin waitfor uamps mmamps end LOOP i FROM 1 TO 10000 begin waitfor uamps mmamps end ENDLOOP ENDPROCEDURE Example 4 Scan for Peak reflection in a single crystal sample PROCEDURE peakscan LOCAL temp in title angle newangle angle mod 48 LOOP iFROM 1 TO 43 angle 55 5 newangle angle i 2 0 angle_mod newangle 90 cset rot newangle change
43. uo Zitl ac uk and request a Federal ID please quote your experiment number also known as the RB or proposal number when requesting the account If everything is correct then depending on the option you selected your files will either be assembled into a ZIP file and you will be prompted to save this to your local disk or you will be offered a page of links from where you can download them individually Note that there is a limit on the number of files 100 and in the case of the ZIP file total size 300Mb that can be downloaded in one go If you are accessing large e g MAPS RAW files you may need to use the individual file links method for the RAW files and then download all the relevant LOG files in a single ZIP file RAW Data File Access This form gives you access to both the RAW data files e g GEM12345 RAW and sample environment log files e g GEM12345 Templ TXT collected at ISIS you just need to select the instrument name type of files RAW LOG and then enter the numbers of the first and last runs you collected The catalogue index was last refreshed with current cycle raw data at 07 50 Tuesday 17 August BST files created after that time will not yet be available for download Instrument First Run Number Last Run Number Contents V RAW files NeXus files LOG files SAV S0 UPDATE STORE SaveRun files DOWNLOAD via ZIP file ZIP file uncompressed Web links to individual d
44. viding the figure on the front page In particular past and present members of the Molecular Spectroscopy Group at the ISIS facility UK 1 CONTENTS Introduction 1 1 The Instrument 1 2 Principle of Operation 1 2 1 1 2 2 Quasi In elastic neutron scattering Diffraction 2 Performing an experiment on IRIS 3 2 1 Before arriving at IRIS 2 1 1 The User Office film badges and swipe cards 2 1 2 Sample Experimental Risk Assessments ERAs 2 2 Selecting sample cans and scattering geometry Flat plate cans 2 2 2 Annular cylindrical cans 2 3 Loading a sample into a neutron beam 2 4 The beam line shutter interlock system 2 5 IRIS Computing overview 2 6 Suitable instrument settings 2 7 Data collection 2 7 1 2 7 2 2 7 3 2 7 4 BEGIN Data inspection END End of the experiment IRIS computing 3 1 Instrument control 3 1 1 3 1 2 3 1 3 3 1 4 S Base 3 1 6 Data Acquisition Electronics DAE Instrument control commands Chopper control SECI and Eurotherm Temperature control Command files 3 2 Data visualisation and analysis O WO O 11 11 11 11 12 12 13 14 14 15 16 18 18 18 18 19 20 20 20 21 22 23 23 23 24 4 References Appendix Appendix Il Appendix Ill Appendix IV Appendix V Appendix VI Appendix VII Appendix VIII Appendix IX Appendix X Quasi Inelastic Settings Diffraction Settings Instrument Param
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