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The OSIRIS User Guide M.T.F.Telling and K.H.Andersen

1. RENAMING A DISPLAY PAGE To rename an existing Display page select Display Pages from the Configuration menu then from the sub menu select Rename Display Page From the new window select the Display page to rename and then enter a new name to finish click OK The Display name will now have been changed to make this change permanent the configuration must be saved ADDING A LABVIEW PANEL TO AN EXISTING CONFIGURATION To add a Labview panel to a configuration it is necessary to have a node on the tree view for Labview panels to do this see section 0 To add a Labview panel select Labview Panels from the Configuration menu and from the sub menu select Add Labview Panel A new Add Labview dialog panel will open from which the display page for the new Labview panel can be selected When a display page is chosen a File dialog box will open from this select the desired Labview VI file and click Open The location of the new VI file will now be listed in the Add Labview dialog panel click Add to add the new Labview panel A new dialog panel will open from this dialog panel it is possible to configure the behaviour of the Labview panel The first option is whether to add any associated INI files to the Labview panel The INI files contain data for initialising and configuring the Labview panels The two other options available for the new Labview panel are whether to start the panel running
2. 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 Shielding the back of the sample with cadmium will reduce background scattering from the sample environment ii 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 but optimising the scattering on the lowest possible Q values where the magnetic scattering is strongest It should also be noted that spurious signals due to Bragg scattering would be reduced at low angles 2 2 2 CYLINDRICAL CANS FOR QENS INS EXPERIMENTS The cylindrical sample cans used on OSIRIS are made of aluminium and are 50mm high by 20mm in diameter 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 14 2 2 3 SAMPLE CANS FOR DIFFRCATION EXPERIMENTS Cylindrical and flat plate aluminiu
3. This can be repeated for as many values as required Click OK when finished The values will now be logged every 10 seconds in C data nstName_RunNum_ValueName txt WEB WAP DASHBOARD OPTIONS The status of an experiment being run by S E C I can be viewed on the web either through a standard internet browser or a WAP equipped mobile phone can be used However 58 there may be occasions when an experiment is of a sensitive nature and the user wants to limit the web access There are two web options that can be enable or disabled on S E C I Display web dashboard by default this is enabled This option sets whether the web dashboard will show any information on the web WAP page Show title by default this is disabled This sets whether the title is shown on the web WAP page Thus it is possible to display the experiment status which anyone can see for remote viewing but not the title which may contain sensitive information These options can be set under Web WAP Dashboard Options in the Options menu by checking the choices on the sub menu These settings are stored in the S E C Lini file S E C LINI SETTINGS There are number of options in S E C I that can only be configured using the S E C Lini file These options are last_user_config this keeps a record of the last configuration used set before S E C I was closed S E C I will automatically load this configuration on start up If a conf
4. provided the current operator has the correct permissions to delete the chosen configuration ADDING ONE CONFIGURATION TO ANOTHER It is possible to add one configuration to the current configuration To do this from the Configuration menu select Add Configuration this will open a window with a list of available configurations From the list select a configuration and click OK the chosen configuration should now get added to the current configuration The new combined configuration will have to be saved for the changes to be permanent CLOSING THE CONFIGURATION Selecting Close Configuration from the Configuration menu will cause the current configuration to be closed and the current operator to be logged out S E C I OPTIONS ADDING OR EDITING CUSTOM BLOCKS AND LOG VALUES S E C I allows the operator to customise the dashboard so that it can monitor experiment values known as blocks which are not included in the main status panel These blocks are added via the Monitor and Log Values option on the Options menu Selecting this option opens a new window form which contains a grid containing the current blocks Select an existing block and click Change to edit it or click Add to create a new block both methods will cause a new windows form to appear This new form allows the block to be configured it is recommended that when configuring a new block to start from the top left and work down to the botto
5. 52 Programmes from the Configuration menu in the sub menu select Add Programme In the new window select the Display page to add the new programme to this will open a file dialog window for selecting the new programme Choose the programme to add then click Open this will close the file dialog window Click Add and the new programme will be added to the Display page The configuration will need to be saved to make this change permanent REMOVING OTHER PROGRAMMES To remove a non Labview programme from a configuration select Other programmes from the Configuration menu in the sub menu select Remove Programme In the new window select the Display page of the programme to be removed then select the actual programme Click OK to remove the programme The configuration will then need to be saved to make this change permanent ADDING A WEB VIEWER TO A CONFIGURATION To add a web viewer to a configuration it is necessary to add a Display page for web pages as discussed in section 0 Then select Web Viewers from the Configuration menu in the sub menu choose Add Web Viewer In the new form select the Display page to add the viewer to and then type in the URL of the web site to display Finally enter a title for the web viewer window and click Add The new web viewer should now appear To add this web viewer permanently the configuration will need to be saved REMOVING A WEB VIEWER To
6. A brief description of the four main software packages and links to further information is given below NOTE DO NOT use the OSIRIS control PC for data analysis 3 2 1 DATA ANALYSIS AND REDUCTION SOFTWARE e 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 isis rl ac uk OpenGENIE To start OPENGENIE click on the OPENGENIE icon on the analysis PC desktop Useful data visualisation commands include older GENIE syntax is also included 25 GENIE v2 Command Open GENIE Command Description ab N N71 2 3 a b N alter binning amN a m N alter markers ass ass Assign d h l m e d h l m e Display l l Limits m m Multiplot c v h c v h Cursor ex ex Exit j OS command j OS command Jump k h k h keep hardcopy p h l m e p h l m e Plot reb reb Rebin set disk my disk set disk my disk set disk set dir mydir set dir mydir set directory set ext raw set ext raw set extension set inst ANY set inst ANY set instrument set par setpar set wksp parameters set title w1 w1 title set title sh data sh data show data sh par sh par show parameters sh def sh def show defaults u u Units Z 7 Zoom e ARIEL ARIEL is the preferred packa
7. Ad d lt 6x10 0 67 steradians 0 8 lt d lt 35 3 to 962 Momentum Transfer Q Inverse Angstroms 0 20 40 60 80 100 120 140 160 Scattering Angle 20 degrees Figure 11 Momentum transfer vs scattering angle for the OSIRIS pyrolytic graphite analyser bank The Q values are those calculated at the elastic line i e Kj Kp Exact values are given in the table below 35 Detector No Spectra Number 20 degrees Q Value 002 Q Value 004 963 963 11 50 0 18 0 37 964 964 14 82 0 24 0 48 965 965 18 15 0 29 0 59 966 966 21 48 0 35 0 69 967 967 24 81 0 40 0 80 968 968 28 14 0 45 0 91 969 969 31 47 0 51 1 01 970 970 34 80 0 56 1 12 971 971 38 17 0 61 1 22 972 972 41 46 0 66 1 32 973 973 44 79 0 71 1 43 974 974 48 12 0 76 1 53 975 975 51 45 0 81 1 62 976 976 54 78 0 86 1 72 977 977 58 10 0 91 1 82 978 978 61 43 0 96 1 91 979 979 64 76 1 00 2 01 980 980 68 09 1 05 2 10 981 981 71 42 1 09 2 19 982 982 74 75 1 14 2 27 983 984 78 08 1 18 2 36 984 984 81 41 1 22 2 44 985 985 84 74 1 26 2 52 986 986 88 07 1 30 2 60 987 987 91 40 1 34 2 68 988 988 94 73 1 38 2 76 989 989 98 06 1 42 2 83 990 990 101 30 1 45 2 90 99 99 104 71 1 49 2 97 992 992 108 04 1 52 3 03 993 993 111 37 1 55 3 10 994 994 114 70 1 58 3 16 995 995 118 03 1 61 3 21 996 996 121 36 1 64 3 27 997 997 124 69 1 66 3 32 998 998 128
8. sxd ccr front panel vi Ready EXITIF tmp 1 printin waiting for ccr SLEEP 5 ENDLOOP cset temp1 t1 LOOP tmp getlabviewvar eurotherm controller details vi Temperature 0 EXITIF abs t1 tmp lt 20 printin waiting for eurotherm SLEEP 5 ENDLOOP 67 ENDPROCEDURE PROCEDURE SXD SCAN sxd sub 155 0 300 0 begin waitfor uamps 60 0 end sxd sub 120 0 300 0 begin waitfor uamps 60 0 end printin Finished ENDPROCEDURE 68
9. Logged in as osiris_mgr From mms 60500 To mms 62500 Counts 0 Figure 7 The OSIRIS S E C I Dashboard 3 1 4 S E C I AND EUROTHERM A complete overview of the Sample Environment Control Interface S E C I can be found in Appendix VII However the basic commands necessary for temperature control are outlined in the following section The temperature of the sample and or sample environment equipment can be set as well as logged from the instrument control PC and any computer terminal connected to the OSIRIS control PC using a VNC connection Each time an OSIRIS run is ended the temperature the log files are closed and new ones are opened The log files are called for example OSI lt block name gt TXT where is the run number The log files are written to the OSIRIS analysis PC along with the RAW file In addition to the RAW and SAVE files and the file JOURNAL TXT is also copied to the 22 analysis PC JOURNAL TXT contains a list Date Run No Users Title Run Duration and uamps of all OSIRIS experiments performed to date In addition data collection can be temporarily suspended when the temperature drifts outside of a specified range There are essentially three aspects to the temperature control system The control PC for issuing the commands the CAMAC unit hardware software interface and the Eurotherm temperature controllers The temperature controllers measure the millivolt output fro
10. PC SAV and RAW files which are copied to the analysis PC once a run is ended can be analysed in greater detail using MOSES MSLICE spectroscopy or ARIEL diffraction data see section 3 2 2 7 4 END AND END OF EXPERIMENT Once the data collected is of sufficient quality for subsequent detailed analysis typing END will stop the run and store the data The data is automatically archived and copies to the OSIRIS analysis PC However before the User leaves the beam line at the end of a scheduled experimental period he she MUST have all irradiated samples monitored for induced radioactivity Assistance and advice in this matter may be sought from the ISIS Health Physics Office 6696 or the ISIS Main Control Room 6789 How to treat radioactive samples ISIS duty officer x6789 gt 10mSv hour Phone ISIS duty officer leave sample within interlocked area Store sample in OSIRIS 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 1mSv hour The sample is not radioactive For removal from ISIS contact the duty officer gt 0 1mSv hour 19 If the sample is not active it should be removed from its can the can cleaned ready for the next Users and the sample dealt with as according to the sample safety assessment i e stored at ISIS removed from ISIS or disposed of by ISIS staff If removal of the sample from ISIS is requir
11. beam divergence does not contribute greatly to the instrumental d spacing resolution At Ad d down to 2 5x10 OSIRIS provides similar resolution to the HRPD 90 bank with the same counting rate as on GEM OSIRIS can reach d spacings in excess of 30 A with high resolution but cannot access d spacing below about 0 9 A due to the curved guide cut off 31 Total d spacing Ariel d spacing Q Time channel Phases uS range range boundaries u S 063 drange 1 0 70 2 90 0 7 2 5 8 9771 2 5136 11700 51700 1011 1566 drange 2 1 80 4 00 2 1 33 2 9924 1 9042 29400 69400 4599 7715 drange 3 2 90 4 90 3 1 4 3 2 0271 1 4614 47100 87100 7590 12859 drange 4 3 70 6 00 4 1 5 3 1 5327 1 1857 64800 104800 10407 17715 drange 5 4 90 7 00 5 2 6 2 1 2085 1 0135 82500 122500 13015 22800 drange 6 5 70 8 00 6 2 7 3 1 0135 0 8608 100200 140200 16100 27973 drange 7 7 00 9 00 7 3 8 3 0 8608 0 7571 117900 157900 19480 33251 drange 8 8 10 10 00 8 3 9 5 0 7571 0 6615 135500 175500 22571 38130 drange 9 8 70 11 00 9 4 10 6 0 6685 0 5928 153200 193200 26062 3609 drange 10 10 2 12 00 10 4 11 6 0 6042 0 5417 170900 210900 28953 8228 drange 11 10 80 13 00 11 0 12 5 0 5713 0 5027 188600 228600 32144 13367 NB include the string dN in the run title to enable Ariel to stitch the data sets together For Table 2
12. flight path L L t is the total flight time t t and d represents the set of d spacings measured ht a 7 2m LsinO PERFORMING AN EXPERIMENT ON OSIRIS 2 1 BEFORE ARRIVING AT THE INSTRUMENT 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 U O in R3 to register his her arrival First time users will be given an information pack detailing all safety aspects at the facility 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 R 5 5 or perhaps the office of his her Local Contact in R3 Outside office hours the MCR will hand out safety information but at the earliest available opportunity arrival should be registered at the U O Before entering building R55 a radiation badge and a swipe card for entry into the experimental hall must be obtained from the MCR 2 1 2 SAMPLE SAFETY ASSESSMENT 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 perform a sample safety assessment and subsequently generate a 12 s
13. 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 i THE SECONDARY SPECTROMETER The secondary spectrometer Figure 3 consists of a 2m diameter vacuum vessel containing a pyrolytic graphite crystal analyser array a 42 element 3He detector banks and a 8 module 962 ZnS tubes diffraction detector bank oriented at 20 170 The pyrolytic graphite analyser bank is cooled installation of the cooling circuit is scheduled for mid 2003 close to liquid helium temperature to reduce background contributions from thermal diffuse scattering Sample Position Vacuum Vessel lt 5 x 105 Tapered super mirror guide section Pyrolytic graphite analyser bank Radial collimator Diffraction detector assembly 960 ZnS tubes Spectroscopy detector assembly 42 He tubes Figure 3 The OSIRIS secondary spectrometer The incident beam monitor is placed immediately after the Polariser Interchanger There is also a transmitted beam monitor in the get lost tube after the sample bin Both are glass bead monitors There are five beads horizontally and 6 vertically and the a
14. period 3 CHANGE rbno Integer e g CHANGE rbno 12345 WAITFOR frames Integer WAITFOR unames Real WAITFOR seconds Ineger WAITFOR time PUSHLABVIEWBUTTON vi name button name push this button on a VI PUSHLABVIEWBUTTON WAIT vi name button name push this button on a VI and wait for it to pop back up Value GETLABVIEWVAR vi name variable name SETLABVIEWVAR vi name variable name value CSHOW ALL CSHOW block CSET block value lowlimit value range low high highlimit value CSET WAIT block value wait for in range CSET CONTROL block CSET DISPLAY block GETRUNSTATE function to return run state e g SETUP WAITFORBOOLEAN TRUE vi name Boolean variable name WAITFORBOOLEAN FALSE vi name Boolean variable name WAITFORBUTTON vi name button name wait for button to pop up Note do not create a variable with the same name as a CAMAC block 66 COMMAND FILE EXAMPLES Example 1 cset control temp 1 300 0 lowlimit 295 0 highlimit 305 0 cset wait temp 1 300 0 lowlimit 295 0 highlimit 305 0 cset wccr 150 0 change title thiourea parabanic acid 300 K wecr 150 Tilt OR2 j 15 10 begin sleep 60 waitfor uamps 30 0 updatestore waitfor uamps 200 0 end Example 2 PROCEDURE SXD_SUB PARAMETERS ccr val t1 LOCAL tmp setlabviewvar sxd ccr front panel vi Target ccr val pushlabviewbutton sxd ccr front panel vi Move LOOP tmp getlabviewvar
15. referenced for specific details Copies of all referenced material is either available in the instrument cabin or on the Internet at the given html address Your Local Contact is also available for assistance and discussion regarding the precise details of the experiment This first section highlights the basic underlying physics of OSIRIS operating as a high resolution quasi in elastic spectrometer and high resolution long wavelength diffractometer Section 2 Performing an experiment on OSIRIS details a typical experimental procedure Finally sections 3 and 4 discuss computer control as well as data analysis and visualisation 11 THE INSTRUMENT OSIRIS can be used as either a high resolution long wavelength diffractometer or for high resolution quasi in elastic neutron scattering spectroscopy With regard spectroscopy it is an inverted geometry instrument such that neutrons scattered by the sample are energy analysed by means of Bragg scattering from large area 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 situated on the N6 B beam line at ISIS 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 description OSIRIS may be considered as consisting of two coupled spectrometer components i THE PRIMARY SPECT
16. seconds 10 seconds before continuing END END Creates RAW files and copies it to analysis PC 64 PAUSE PAUSE RESUME RESUME ABORT ABORT CSHOW block_name CSHOW temp1 CSHOW temp1 CSET block value CSET temp1 5 0 CSET temp1 5 0 CSET CONTROL block value lowlimit low highlimit high CSET CONTROL temp1 5 0 lowlimit 4 8 highlimit 5 2 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 65 Whichever you use you will get a command which you can type to begin running the file Procedure commands include all standard open genie commands with the following additions BEGIN start data collection END stop data collection PAUSE RESUME UPDATESTORE create a SAV file from the DAE CHANGE title String e g CHANGE title new title CHANGE user String e g CHANGE user new user CHANGE period Integer e g CHANGE
17. the limits LOWLIMIT and HIGHLOIMIT are used to inhibit data collection because of the CONTROL prompt If TEMPI varies outside this range OSIRIS go into the WAITING state until the value returns into the range CSET NOCONTROL TEMP1 Data collection vetoing is disabled if TEMPI falls outside HIGHLIMIT or LOWLIMIT SETEURO Pz1 D 1 1 1 Sets P I D 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 P I D values for the different sample environment apparatus used on OSIRIS are listed in Appendix IV 3 1 7 COMMAND FILES Automatic control of OSIRIS 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 An simple example GCL file is given on the next page 24 PROCEADURE Example Measure at T 1 5K on d range 1 and T 10K on d range 2 cset control temp1 1 5 highlimit 3 0 lowlimit 1 0 drange 1 begin change title An OSIRIS experiment at T 1 5K d1 waitfor uAmps 50 end ENDPROCEADURE To load a GCL command type LOAD lt file gcl gt into the active Open Genie window A GCL command file will not run unless it loads into Open Genie without error 3 2 DATA VISUALISATION AND ANALYSIS Data visualisation and subsequent analysis on OSIRIS utilises PC based software
18. then choose Set Properties for Panels from the sub menu A new window will appear the same as in section 0 The checkboxes in the Visible column show whether a panel is visible or not checked for visible unchecked for not The visibility of a Labview panel can be set by clicking on the checkbox When finished click OK to close the window The configuration will then have to be saved to make any changes permanent SETTING A LABVIEW PANEL TO RUN AUTOMATICALLY Labview panels can be set to run automatically after loading or not when S E C I This property is set in the same window as discussed in sections 0 and 0 To open this window select from the Configuration menu Labview Panels and then choose Set Properties for Panels from the sub menu In the new window there is a column called Run at Start up If the checkbox is checked for a Labview panel then it will start running when it is loaded if it is unchecked then it will load but will require the user to start it By clicking the checkbox this setting can be changed from on checked to off unchecked Click OK to keep the changes and close the window To make these changes permanent the configuration will need to be saved ADDING NON LABVIEW PROGRAMMES TO CONFIGURATIONS To add non Labview programmes to a configuration it is necessary to add a Display page for these programmes as shown in section 0 If this has been done then select Other
19. 02 1 69 3 39 999 999 131 35 1 71 3 42 1000 1000 134 68 1 73 3 46 1001 1001 138 01 1 75 3 50 1002 1002 141 34 1 77 3 54 1003 1003 144 67 1 79 3 57 1004 1004 148 00 1 81 3 60 36 APPENDIX IV P I D 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 Prop Int s Deriv s 1 5 3 1 0 17 5 10 3 10 1 67 10 20 1 10 1 67 20 300 1 50 8 3 Orange Cryostat control on the sample Temp K Prop Int s Deriv s 1 20 2 40 6 7 20 50 2 100 16 7 50 100 2 200 33 3 150 300 2 999 166 5 CCR Temp K Prop Int s Deriv s 10 50 2 50 8 3 50 150 2 100 16 7 150 300 2 200 33 3 37 APPENDIX V 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 voluntarily agree to provide some form of out of hours User support The first point of call after this manual should be the Local Contact for the experiment assistance being available during reasonable hours The definition of reasonable depends upon the individual concerned However as a general rule for local contacts on OSIRIS and members of the technical suppo
20. 25 0 16 6 15000 0 14000 0 50817 0 1500 PG002 OFFSET3 16Hz 75000 0 75000 0 52817 0 2805 l B 0 05 to 2 0 50 40500 0 35300 0 48323 0 6569 PG002 OFFSET4 60500 0 55300 0 50323 0 10861 0 3 to 1 0 50 48500 0 43600 0 48323 0 8207 PG002 OFFSETS 68500 0 63600 0 50323 0 13502 004 99 3 0 to 4 0 50 22500 0 19000 03 31291 0 3717 PG004 42500 0 39000 0 33291 0 5657 2 0 10 7 0 50 20500 0 16700 0 29398 0 3217 PG004 OFFSETI 40500 0 36700 0 31398 0 4904 Table 1 Standard Quasi In elastic settings 20 APPENDIX II DIFFRACTION SETTINGS The diffraction detectors are placed in a ring around the incident beam They cover the full range of scattering angles 20 from 150 to 171 providing a total solid angle coverage Sp of 0 67 steradians Figure 8 Diffraction modules as seen from the sample position Module Detectors 3 122 123 242 243 362 363 482 483 602 603 722 723 842 843 962 O1 G N The detectors are shown schematically above and as seen from the sample position They are scintillators and the full detector bank contains 8 modules numbered according to the order in which they were installed Each module consists of 120 detector elements The first 20 are single detectors Between 21 and 120 the even numbered detectors are still single but the odd numbered are physically composed of one detector above and one below the central strip hardwired togethe
21. 3AVHON3 YO dWViS 8863 6 8 OL SkMO NOO SNIMYO SIHI en V OO Z80 900k 15 E 43 y 00 060 900p 1I S zZzl y SNYI JidWwvS 3 S 1139 uv 1ANNY X NOINIWO TV T1329 mu 0 400 SONO HORIS JAL 30 AOL 3 1 COLO igs 303909 190 9009 19 6 6 x a men s oi A Em E mugto 303309 00 07 18 5 sss moz 202275 C eee NY 00 060 900b 15 2 44 CAD drawing numbers for 50 mm x 40 mm OSIRIS flat plate sample cans Window frame 0 2 Si 4206 309 Window frame 1 0 Si 4206 313 CAD drawing numbers for 50 mm x 26 mm OSIRIS flat plate sample cans Si 4206 322 Si 4206 323 Si 4206 324 Si 4206 325 Si 4206 326 Si 4206 327 Window frame 1 0 Si 4206 328 Window frame 2 0 Si 4206 329 45 APPENDIX S E C I INFORMATION INTRODUCTION The Sample Environment Control Interface S E C I programme s main role is to manage the instrument control software essentially S E C I is responsible for organising and displaying the software that actually runs the experiment such as Labview etc S E C I was developed in house at ISIS in an attempt to meet the unique requirements of the experiments carried out on site WHAT IS S E C I In basic terms S E C I is made up of three parts these are the dashboard the tree view and the configuration files 1515 Sample Environment Contro
22. 996 2082 CCLRC Rutherford Appleton Lab Open GENIE comes with ABSOLUTELY NO WARRANTY for details type warranty This is free software and you are welcome to redistribute it under certain conditions type licence for details A start 892 Windows Lebview EN open 8 Open 1 C miscripts aG 1515 Sample E Address E regeat 1 lt 1619 46 The dashboard appears at the top of the screen and provides an overview of the instrument status The dashboard itself is divided up into three main parts from left to right The error box any errors that occur in the experiment are listed in this box The main status panel lists a number of experimental values examples run time beam current number of counts etc which are updated every two seconds The block list this area can be customised to list experimental values which are not included in the main status panel The tree view groups the experiment in to manageable pieces which can be viewed separately from each other By selecting the appropriate node on the tree S E C I hides all the other nodes and only displays the selected one The contents of the nodes are customisable for example all the control panels for the experiment can be grouped under one node or alternatively they could be grouped by type or even individually The configuration files are text files that are used to set up S E C I f
23. ROMETER BEAM TRANSPORT The primary spectrometer is illustrated below in Figure 1 OSIRIS disk choppers converging m 3 6 SM quide qf curved m 2 SM quide B _ curved Ni quide 22K decoupled converging m 2 SM guide IRIS H gt moderator Figure 1 The OSIRIS primary spectrometer Neutron beam transport from moderator to sample position is achieved using a curved neutron guide Due to the curvature of the guide no neutron with a wavelength less than approx 1 5 is transported While the majority of the guide section consists of accurately aligned m 2 super mirror sections approx 1m long and rectangular in cross section a 1 5m long converging m 3 guide piece terminates the end The tapered component helps focus the beam at the sample position 44 mm high by 22 mm wide but also serves to increase flux The incident neutron flux at the sample position is approximately 2 7 x 10 n cm s white beam at full ISIS intensity with the wavelength intensity distribution at the sample position up to 12 being illustrated in Figure 2 Note however that the flux at longer wavelengths gt 12 A is still sufficient to detect Bragg peaks with d spacing close to 17 5 corresponding to 35 neutrons without significant frame overlap 25 intensity ES as 6 Wavelength Figure 2 Comparison of wavelength distributions on OSIRIS IRIS and HRPD The wavelength profile on OSIRIS is i
24. Standard Diffraction Settings at 25Hz drange is used to change chopper phases and load new time channel boundaries example Aluminium d4 Room Temperature 32 Offset intensity arb units 1 0 1 5 2 0 2 5 3 0 d spacing Angstroms Empty Sample Bin No Gd Foil Empty Sample Bin Gd Foil Vanadium Rod 5mm dia No Gd Foil Vanadium Rod 5mm dia Gd Foil Vanadium Rod 5mm dia Gd foil Before April 08 Figure 10 Low d spacing background features observed when measuring i the 5mm diameter vanadium standard and b the empty sample bin The effect of coving the sample bin s aluminium exit window with gadolinium foil is also illustrated Al Aluminium V vanadium Gd gadolinium 33 APPENDIX III INSTRUMENT PARAMETERS Operating vacuum 2 x 10 mb instrument tank analyser ON 3 x 10 mb instrument tank analyser OFF 4 x 10 mb sample environment bin Primary instrument flight path L 34 00 m Inelastic Analysing energy for graphite at 8K PG002 Analysing energy for graphite at 8K PG004 Average secondary flight path Angular coverage of He detector bank Spectrum numbers Diffraction Average secondary flight path Angular range of diffraction detectors Resolution Solid angle d spacing range Spectrum numbers 34 1 845 meV 7 375 meV L 1 582 m 11 20 155 963 to 1004 L5 1 005m 167 1 20 172 4 5x10 lt
25. The OSIRIS User Guide 3 Edition M T F Telling and K H Andersen ISIS Facility Rutherford Appleton Laboratory Chilton Didcot OX11 0QX February 2008 PREFACE This user guide contains all the information necessary to perform a successful neutron scattering experiment on the OSIRIS spectrometer at ISIS RAL UK Since OSIRIS 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 OSIRIS is the Instrument Scientist Local Contact It would be appreciated however if this user guide were the first point of call should problems arise ACKNOWLEDGEMENTS It is a pleasure to acknowledge all those who have contributed to the production of this user guide In particular past and present members of the Molecular Spectroscopy Group at the ISIS facility UK for fruitful discussion and comments CONTENTS 1 Introduction 1 2 The Instrument Principle of Operation 1 2 1 Quasi in elastic neutron scattering 1 2 2 Diffraction 2 Performing an experiment on OSIRIS 2 1 2 2 2 3 2 4 2 5 2 6 2 7 Before arriving on OSIRIS 2 1 1 The User Office film badges and swipe cards 2 1 2 Sample safety assessment Selecting sample cans and scatterin
26. This will opened the Dashboard options window from this window the following options are available Add A Graph this option sets up a graph plot to monitor a block value Change A Graph allows the properties of an existing graph to be changed Delete A Graph this option will remove an existing graph from the Dashboard page Show or hide the big dashboard choose whether to show the big version of the S E C I dashboard on the Dashboard page Show or hide the OpenGENIE scripting window choose whether to add the OpenGENIE scripting window to the Dashboard page Add A Block Display Box this option will add a window box to the Dashboard page which contains the value s for a chosen block or blocks Change A Block Display Box this option allows the properties of an existing display box to be changed Delete A Block Display Box this option will remove an existing display box from the Dashboard page 57 When Add A Graph is selected a new window opens from this window select the block to be plotted Next choose whether to plot the set point then enter a label for the Y axis and a name for the graph Finally choose whether to show another block on the same graph and whether to increase or decrease the graph buffer size the number of points stored Click OK to add the graph Choosing Change A Graph will open a new window in this window all the values set for the graph when a
27. VI as the page type Click OK 2 Select Configurations gt Labview Panels gt Add Labview Panel In the new window do the following Choose Eurotherm Page as the display page In the file dialog window navigate to Muon Eurotherm Front Panel in this directory select Eurotherm Front Panel vi and click Open 60 Click Add and a new window opens Select Run VI When Loaded and click OK The Labview panel should now appear Repeat 1 but call the new page ITC Page Repeat 2 but for the ITC Page and navigate to the SOLOITCFRONTPANEL directory in the Oxford Software directory and choose SoloITC503 2 vi Again select Run VI When Loaded For this example it is necessary that the SoloITC503 2 vi always loads first Select Configuration gt Labview Panels gt Set Panels Startup Order A new window will appear with the two VIs listed change the order for the SoloITC503 2 vi from 10001 to 1 and click OK It is decided that it would be useful to display the Sample temperature from the Eurotherm panel on the S E C I dashboard It is also required that the values are logged in a text file From the Options menu select Monitor and Log Values a new window will open Click the Add button and do the following starting from the top left Choose Eurotherm Page from the list of display pages then select the VI e Sele
28. age to move it to Click OK and the Labview panel will now be shown on the chosen Display page To make the change permanent the configuration will need to be saved EDITING THE START UP ORDER OF THE LABVIEW PANELS The behaviour of one Labview panel may depend on one or more other Labview panels and subsequently the order in which the panels are loaded may be of significance To set the start up order of the panels select from the Configuration menu Labview Panels and then choose Set Properties for Panels from the sub menu A new window appears containing a chart of the Labview panels in the configuration In this chart it is possible to set 51 the order in which the Labview panels are loaded Each panel must have a unique value for the order Any panels that have not been explicitly set an order number will be assigned an order number greater than 10 000 by S E C I It is also possible to set a wait time for each panel this indicates how long after the previous panel has loaded should the panel wait before loading Once any editing has been completed click OK to finish To make any changes permanent it is necessary to save the configuration SETTING THE VISIBILITY OF THE LABVIEW PANELS It is possible to hide Labview panels when the user does not need to know about them The visibility of all the panels can be edited or reviewed in one window To do this select from the Configuration menu Labview Panels and
29. ample safety assessment sheet 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 should collect his her sample safety assessment sheet from the filing cabinet in the Data Assessment Centre D A C building R55 and display it in the pocket beside the sample environment enclosure for the entire duration of the experiment The user should have viewed the safety video and also read the safety handouts given to them when they arrived 2 2 SELECTING SAMPLE CANS AND SCATTERING GEOMETRY Sample can selection is usually determined by the type of experiment to be performed i e diffraction or spectroscopy form of the sample and or the sample environment equipment to be used Two geometries are available cylindrical or flat plate 2 2 1 FLAT PLATE CANS FOR QENS INS EXPERIMENTS The flat plate cans used on OSIRIS are made of aluminium and allow for a sample with a cross sectional area 40 x 40 mm but of variable thickness 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 1 not gt t In J cA where T is the incident intensity I is the transmitted intensit
30. by the DAE Copies the contents of the DAE Restarts data collection by the DAE The contents of the DAE are written to the file OSI S number where run number and number is incremented each time UPDATESTORE is issued during a measurement Stops data collection by the DAE Does NOT store data Sets DAE state to SETUP Stops data collection by the DAE Copies the contents of the DAE memory to file OSI RAW Increments the run number Sets DAE state to SETUP 21 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 3 1 3 THE DASHBOARD As mentioned in section 2 5 the OSIRIS Dashboard Figure 6 displays information abort the current run such as current DAE state RUNNING SETUP etc and run number In addition information concerning the User sample run time frame proton pulse count present and accumulated proton beam current the incident beam monitor counts and any sample environment parameters being monitored is also displayed 1515 Sample Environment Control Interface Version SECI2 1 1 48 18090 nn 1 1 10 18043 File Configuration SourceSafe Options Help OSIRIS IS SETUP PG002 Van Rod RT 05 2 Minimise Keep on top RUN NUMBER 55194 13 09 2005 17 19 59 Good Frames 0 Raw Frames 0 0 0 0 0 RunTime 13 SEP 2005 17 19 59 DAEBytes 8092044 Periods 1 Config Name basic
31. cannot be removed until the intermediate shutter is closed In principle this means that all active areas on the OSIRIS beam line are inaccessible while the intermediate shutter is open The area underneath the instrument platform for will require access for some future instrument configurations is only accessible with the main shutter has closed Entry into this area is only allowed under the supervision of the Local Contact or Instrument Scientist 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 the A keys for access to interlocked areas 2 5 OSIRIS COMPUTING OVERVIEW OSIRIS is controlled using a PC running LabView based instrument and sample environment control software referred to as S E C I Sample Environment and Control Interface Detailed information about the S E C I interface can be found in Appendix VII however the basic components of the S E C I are shown in Figure 6 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 osiris raw files The S E C I system can be configured to start only those sample environment and or instrument control components for example chopper cryomagnet dilution refrigerator control software
32. ct Sample Temperature Numeric from the Value to Read list Ignore the optional parameters and enter Sample_Temp as the name and K as the units Leave the remaining settings as their default values and click OK then click OK again to close the final window The Sample Temperature should now be displayed in the dashboard and be logged in c data It is now decided that plotting a graph of the Samp Temp on the Dashboard page would be useful to do this Select Option gt Dashboard Page Options 61 In the new window click Add A Graph Choose the Sample Temp block and enter Temperature for the Y axis name and Sample Temp for the graph name Then click OK The graph should now appear on the Dashboard page of the tree view A simple configuration has now been created and this can be saved Warning do not use this configuration on an instrument as it is only an example 62 APPENDIX IX COMMAND LINE SCRIPTING Scripting on the PC is done via an Open GENIE window The command style is very similar to the VMS operating system i e COMMAND QUALIFIER valuel value2 keyword1 value3 keyword2 value4 For example CHANGE title new title user new user CSET WAIT temp1 4 0 There are a few important differences from VMS however Character strings must 6699 always be included in quotation marks this is to distinguish them from words or functions that form pa
33. ctive component is Lithium The monitor efficiencies are wavelength dependent but always less than 1 over the range of wavelengths accessible on OSIRIS 1 2 PRINCIPLE OF OPERATION 1 2 1 QUASI IN ELASTIC NEUTRON SCATTERING In brief 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 to 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 Figure 4 An indirect geometry inelastic neutron scattering spectrometer During an OSIRIS experiment the two disc choppers are used define the finite range of neutron energies incident upon the sample S 1 2 h y and p m v 7 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 conditions A 2dsin Bragg 2 are scattered toward the detector bank D equations 1 and 2 can be re formula
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35. dding the graph be changed Click OK to accept the changes Selecting Delete A Graph will open a window listing the existing graphs Select the graph to delete and click OK The graph will now be deleted When Add A Block Display Box is selected a new window opens first add a name for the new display box and then choose which blocks to add to the box To select a block to add choose the block from the list then click Add Selected Block Now If a wrong block is added it can be removed by selecting it in the Blocks To Be Displayed list and click Remove Selected Block When all the required blocks have be added click OK to create the display box Choosing Change A Block Display Box will open a new window In this window select the display box to be added then blocks can be added or removed from this box Click OK when finished to accept the changes Selecting Delete A Block Display Box will open a new window In the list of display boxes chose the box to be deleted and click OK to delete it For all the options in the Dashboard Page Options it is necessary to save the configuration afterwards to make the changes permanent LOGGING DISPLAY VALUES It is possible to log the values listed in the main status panel To do this select Log Display Values from the options menu A new dialog window will appear in this window select the value to log and click Add
36. ed 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 should be logged in 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 bring back It 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 III COMPUTING 3 1 INSTRUMENT CONTROL 3 1 1 DATA ACQUISITION ELECTRONICS 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 On OSIRIS there are 1004 spectra Spectra 1 and 2 are the incident and transmission beam monitors respectively Spectra 3 to 962 correspond to individual diffraction detectors Spectra 963 to 1004 relate to the spectroscopy detector bank Instrument parameters i e flight path angle associated with each spectrum are tabulated in the Appendicles Each spectrum contains a histogram of neutron counts versus time of flight At the end of the ru
37. elete configurations saved by other Users Open any saved configuration Create new configurations Edit configurations and save them under a different filename To add an account select Add User from the File menu Administrator only In the dialog panel enter in the new account name and password then select the type of account required and click OK The new account is now added to the account database Note this account will be valid for all instruments To remove an account select Remove User from the File menu Administrator only In the dialog panel select the group of the user and then the user s name from the list To delete the account click OK 48 CONFIGURATIONS As stated previously configurations are used to configure S E C I for different experimental set ups They determine which programmes S E C I loads Labview OpenGENIE and so on which initial values equipment take and which nodes are available on the tree view Through S E C I it is possible to open different configurations modify existing configurations and create new configurations OPENING A CONFIGURATION To open a configuration it is necessary to be logged in with a valid account From the Configuration menu select Open Configuration this will open a dialog form which lists all the available configurations for the current instrument From the list select the required configuration and click OK S E C I
38. es between which data is collected for example if there was a temperature block it may be possible that only data for temperatures between 10 C and 20 C needs to be recorded There is an option to save the block value toggle on or off this is for when a block does not change during the experiment rather than logging an unchanging value the value of the block is saved once at the end of the run THIS CURRENTLY DOES NOT WORK AS S E C I DOESN T KNOW WHEN AN EXPERIMENT ENDS The final option is to enable or disable the block If the block is disabled it will no longer log or update the values The dashboard will still show the block name but with disabled written next to it When the block has been configured click to finish 56 Blocks can also be deleted to do this select the block in the grid and then click Delete The order in which blocks appear on the dashboard can also be set by clicking Change Order This will open a new window in which the all the blocks are listed By selecting a block and clicking the Up or Down button the block s position can be changed as required Click OK to accept the changes To make any changes permanent it is necessary to save the configuration DASHBOARD PAGE OPTIONS This section refers to the dashboard page node of the tree view not the S E C I dashboard To access the Dashboard page options select Dashboard Page Options from the Options menu
39. ff TPG2 0 mbar 13 lines scanned compiled gading Smalltalk image from C Program Files CCLRC ISIS Facility Open GENIE ge TPG2 run control Off Open GENIE successfully started at 05 Sep 2005 16 15 03 0100 ER dns TCL commands if Per ad from C Program Files CCLRC ISIS Facility Open GENIENcre te lNinterface t cl GENIE U2 2 BUILD 53 Linked Jun 28 2005 89 59 33 library version 1 KRunning on x86 Windows_NT 5 1 built with MS visual C 05 0 or greater Copyright lt C gt 1996 2082 CCLRC Rutherford Appleton Lab Open GENIE comes with ABSOLUTELY NO WARRANIY for details type warranty This is free software and you are welcome to redistribute it under certain conditions type licence for details 22 Windows E Labview 83 Open GENIE Bi Open GENE 1 C eris a ISIS Sample E Address regedt Be 16 Figure 6 The OSIRIS S E C I interface 2 6 SUITABLE INSTRUMENT SETTINGS OSIRIS can be configured to match the scientific problem under investigation by simply 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 instrument resolutions is dependant upon the different analyser reflection used Selecting a particular analyser reflection and hence resolution and energy transfer range is achieved by defining a the frequency and phases time delay se
40. g geometry 2 2 1 Flat plate cans for QENS INS experiments 2 2 2 Cylindrical cans for QENS INS experiments 2 2 3 Sample cans for diffraction experiments Loading a sample into the neutron beam The beam line shutter interlock system OSIRIS computing overview Suitable instrument settings Data collection 2 7 1 CHANGE 2 7 2 BEGIN 10 11 12 12 13 13 14 15 18 18 2 7 3 Inspecting data 2 7 4 END and end of an experiment 3 OSIRIS Computing 3 1 Instrument Control 3 1 1 The Data Acquisition Electronics 3 1 2 Instrument Control 3 1 3 The Dashboard 3 1 4 S E C I and Eurotherm 3 1 5 Temperature control 3 1 6 Command files 3 2 X Data Visualisation and analysis 3 2 1 Data Analysis and Reduction Software 4 References Appendix INS Settings Appendix Diffraction Settings Appendix 1 Instrument Parameters Appendix IV P I D parameters Appendix V Out of hours support Appendix VI Useful telephone numbers Appendix VII Useful diagrams Appendix VIIIS E C I Information Appendix IX Command Line Scripting 18 19 20 20 20 21 22 22 23 24 25 25 28 29 30 34 37 38 39 40 46 63 l INTRODUCTION This user guide contains all the information necessary to perform a successful neutron scattering experiment on the OSIRIS spectrometer at the ISIS Facility RAL UK However to ensure it is as concise as possible other manuals and reports are
41. ge for the reduction of diffraction data collected on OSIRIS i e reducing the data to GSAS CCSL or some other portable format ARIEL runs under IDL For details about how to use AREIL see http www isis rl ac uk disordered gem Software Ariel3 lrelease htm 26 e LAMP LAMP is an alternative package for the reduction of diffraction data collected on OSIRIS i e reducing the data to GSAS CCSL or some other portable format LAMP runs under IDL with a convenient syntax for manipulating neutron data For details about how to use LAMP see http www isis rl ac uk molecularspectroscopy osiris osiris dataanalysis htm However the LAMP code is no longer supported at ISIS and as a result this package is to be superseded by ARIEL e MOSES MOSES is a suite of programs for the full reduction and analysis of OSIRIS spectroscopy data An online MOSES manual can be found at http www isis rl ac uk molecularspectroscopy osiris A more in depth descriptions of the individual analysis programs themselves can be in the GUIDE and IDA manuals These can be found online at http sutekh nd rl ac uk wsh index html MOSES can be launched by typing clicking on the MOSES icon on the OSIRIS analysis PC desktop e MSLICE MSLICE is a MatLab based analysis tool predominately used for the visualisation and analysis of magnetic excitations MOSES is used to convert the RAW data to a format that can be read by MSLICE Informa
42. iguration causes S E C I to crash on starting then a different configuration can be set here username file this sets which user file is used to check passwords against This should never need to be changed last run number this records the last run number before S E C I was closed This should never need to be changed status colours this determines whether the status colours on the S E C I dashboard are activated It must be set to true or false last_user this keeps a record of who was logged in when S E C I was closed S E C I will start with this user logged in 59 UseNewDAE some instruments are using a newer version of the DAE software this Boolean determines whether this is the case RunningICP this Boolean determines whether ICP is being run IsMuons this Boolean is used to set whether the experiment is a Muon experiment If this is true then the monitor values are not shown on the S E C I dashboard These options should only be changed if you are certain you know what you are doing S E C I EXAMPLES CREATING A SIMPLE CONFIGURATION In this example a simple dummy configuration will be created Starting from a blank configuration no extra pages or Labview panels l Select Configurations Display Pages gt Add Display Page In the new window Select Instrument as the Page Group Type in Eurotherm Page as the Display Name to Create Choose
43. l Interface Version SECI2 1 1 48 18090 SECICOM 1 1 10 18043 MUSR IS RUNNING Experiments Minimise Keep on top RUN NUMBER 33548 05 09 2005 16 19 10 RBNumber 555 Good Frames 453195237 MonitorPd 1 Phone RAL Raw Frames 463195237 Spectrum 88 Curr Tot Test Clock From mms 1000 125 DAEBytes 110881528 To mms 1996 65625 Counts 0 a RunTime 0 01 46 02 Config Name ccr Logged in as musr mar E Sample Environment Steering Magnets Data Collection DAE Seripting Logging Dashboard MakScript Open Genie Help and Bugzilla Bugzilla Machine Status Beam Status MCR News TEMPO 0k TEMPO Setpoint TEMPO run control Off itemp2 0 K itemp2 Setpoint temp2 run control Off 71 007 T T T 1 16 15 16 15 16 16 16 16 16 17 16 17 16 17 16 18 16 18 16 19 Time ex Open GENIE 1 oix mm efault directory data k TPG1 0 mbar Open GENIE successfully started at 5 Sep 2005 16 15 03 0100 run control Off TPG2 0 mbar 13 lines scanned compiled gading Smalltalk image from C Program FilesNCCLRC ISIS FacilityNOpen GENIE ge TPG2 run control Off wading TCL commands if needed from C Program Files CCLRC ISIS Facility Open GENIENsrcNtclsinterface tcl pen GENIE U2 2 BUILD 53 Linked Jun 28 2005 09 59 53 library version lt Running on x86 Windows_NT 5 built with MS vistar C 05 0 or greater Copyright lt C gt 1
44. le an Instrument Scientist could save a configuration as a User thus the User will be able to overwrite the configuration To use Save Current Config click that button the configuration will then be saved depending on the permissions To use Save Current Config As click that button the window will then change In the changed window either enter in a new configuration name or select an existing one then click OK The configuration will then by saved if the permissions are correct To use Save As Other User click that button the window will then change In the changed window either enter in a new configuration name or select an existing one Then select the permission group and username with which the configuration is to be saved Finally click OK and the configuration will be saved provided the permissions are right Viewing a configuration allows the operator to view the Labview panels in a chosen configuration To do this click the View A Config button this will change the window In the changed window select the configuration to be viewed after a few seconds the list of Labview panels will be displayed Click OK to exit 54 Deleting a configuration allows the operator to delete a chosen configuration Clicking the Delete A Config button changes the window form then from the changed form select the configuration to be deleted and click OK The configuration will then be deleted
45. llustrated in Figure 2 The increased in intensity on OSIRIS compared to that observed on IRIS is due to the use of the super mirror guide sections from moderator to sample at present IRIS consists of accurately aligned nickel plated glass tubes approx 1m long and rectangular in cross section terminated by a 2 5m long converging nickel titanium supermirror section The flux on HRPD though much lower for cold neutrons extends to shorter wavelengths since HRPD views the liquid methane CH4 moderator at 100K which gives an intensity maximum around 2 In practice the wavelength distribution illustrated above bears little resemblance to that observed in the incident beam monitor during an actual OSIRIS experiment since 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 energies incident upon the sample during the experiment Located at approx 6 3m 66 degree aperture and 10m 98 degree aperture 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 the neutron 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 to the
46. m resistance thermometers Rh Fe or Pt or thermocouples usually type K and control the temperature 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 mainframe 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 Dashboard usually displays both the millivolt readings and the corresponding K or C value TEMPI and TEMP2 are examples of two software temperature control blocks in S E C I that correspond to the two EUROTHERM temperature controllers 3 1 6 TEMPERATURE CONTROL Listed below are the more useful commands in the S E C S relating to the control of temperature The controls are entered in the active Open Genie window CSET TEMP1 10 Sets temperature observed temperature control block TEMP1 to 10 K CSHOW TEMP1 Displays information about the current status of TEMPI CSET CONTROL TEMP1 15 LOWLIMIT 10 HIGHLIMIT 20 23 This command issues a set point value of 15 K or C to temperature control block TEMPI The controller attempts to maintain a temperature of 15 5 K or C as denoted by
47. m right This guide will provide a walkthrough for creating a new block starting from the top left 55 10 Choose a Display page from the available Labview Display pages this will create a list of the panels VIs available From the list of panels choose the panel which contains the value to be monitored Once a panel has been chosen the three lists on the next row down will be populated The first list working from left to right contains all the values and their type i e Boolean integer etc that can be monitored on the chosen panel Highlight the required variable to continue Optional The second list allows a set variable to be assigned This allows OpenGENIE to send new values for this variable to the Labview panel Optional If a set variable is assigned it may be necessary for OpenGENIE to push a Labview button to send the new value The third list chooses which button to press A name for the block must be entered and the option to include is also available The next three parameters to set are the frequencies for logging the block values and for updating the blocks in the dashboards This is done by setting the intervals in seconds which S E C I will wait before logging the value or updating the dashboard A value of zero will mean that the logging or updating will be disabled The next option is to decide whether to turn Run Control on by default it is off Run control determines a range of valu
48. m sample cans can be used for diffraction experiments on OSIRIS However such cans should be used when the d spacing region of interest is greater than 2 2 Angstroms since any diffraction pattern collected below this value will exhibit a forest of strong Al Bragg reflections Ideally thin walled cylindrical vanadium sample cans should be used These vary in length from 50mm to 75mm and have diameters ranging from 5mm to 11mm When working with air sensitive samples they can be fitted with Teflon O rings for measurements at room temperature Cu O rings for use in furnaces or indium seals for low temperature measurements 2 3 LOADING A SAMPLE INTO THE NEUTRON BEAM Most experiments on OSIRIS utilise the Orange cryostat a card detailing its operation can be found in the pocket attached to the cryostat trolley If one is not available inform the Local Contact who will obtain a replacement and or go through the operation of the cryostat and sample loading procedure However should a different piece sample environment equipment be requested e g a CCR or Block heater the Local Contact will provide assistance loading samples etc Note only personnel with a crane operator s licence see Dennis Abbley for details x 5455 are permitted to crane sample environment apparatus into and out of the beam line 2 4 THE BEAM LINE SHUTTER INTERLOCK SYSTEM The OSIRIS beam line shutter interlock system comprises of two coupled electronic mechanical c
49. n the contents of the DAE are automatically copied to a file on the OSIRIS analysis PC called OS RAW where is a five figure run number incremented automatically at the end of each run Shortly after creation this RAW file is also archived 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 20 PAUSED WAITING Data collection is temporarily suspended by the User Data collection is temporarily suspended for example when a cryostat temperature is outside defined limits 3 1 2 INSTRUMENT CONTROL The instrument control PC is used to start and stop data collection However it also allows data collection to be suspended temporarily to allow for example entry into an interlocked area Data collection can also be suspended automatically if the sample environment control system section 3 1 5 indicates that for example the temperature has drifted outside of pre defined limits Commonly used instrument control commands include BEGIN PAUSE RESUME UPDATESTORE ABORT END 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 dashborad Suspends data collection by the DAE Sets DAE state to PAUSED Resumes data collection by the DAE Sets DAE state to RUNNING Suspends data collection
50. needed for individual experiments Those instrument sample environment components that are active are listed on the left hand side of the S E C I window The status of the instrument and details about the experiment is displayed on the Dashboard found at the top of the screen see 3 1 4 Commands to control the instrument are entered into an OpenGenie window 16 ISIS ES Environment Control Interface Version SECI2 1 1 48 18090 SECICOM 1 1 10 18043 File Options Help MUSR IS RUNNING Experiment9 Minimise IV Keep on top RUN NUMBER 33548 05 09 2005 16 19 10 TPG2 0 mbar RBNumber 555 GoodFrames 463185237 MonitorPd 1 Phone RAL Raw Frames 463195237 Spectrum 88 User Chuck Curr Tot Test Clock From mms 1000 125 a RunTime 0 01 46 02 DAEBytes 110881528 To mms 1996 65625 Periods 1 Counts Spectra 7290 Config Name ccr Logged in as musr mar Channels 3801 Sample Environment Magnets TPG Beamline Steering Magnets Data Collection DAE Scripting Logging Dashboard MakScript Open Genie Help and Bugzilla Bugzilla Machine Status Beam Status MCR News TEMPO 0k TEMPO Setpoint TEMPO run control Off temp2 0 K temp2 Setpoint 2 run control Off 007 T T T 1 16 15 16 15 16 16 16 16 16 17 16 17 16 17 16 18 16 18 16 19 Time Open GENIE 1 oix efault directory data TPG1 0 mbar TPG1 run control O
51. ontrol 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 OSIRIS 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 Instrument Scientist or Local Contact For information main shutter controls can be found beside 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 consist of three boxes shutter control A key and master key and of a 15 set of interlock keys a master key N6B M and three A keys labelled N6B 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 N6B M The master key can then be inserted into the lock in the side of the master key box Once in position and turned the intermediate shutter can be opened by pressing the open button on the shutter control box Upon pressing open the master key is locked into position and
52. or different experiments or instruments The configurations are created by the instrument scientists through S E C I The configuration file principally determines which nodes are available in the tree view which programmes populate these nodes and which if any experimental values are listed in the block list USING S E C I ACCOUNTS The File menu is used for adding or removing user accounts and for logging in or out To log in you must have an S E C I account and know the relevant password There are three types of account in order of power Administrator Instrument Scientist and User Of these the user and instrument scientist accounts are the most used 47 The Administrator accounts have the following privileges Create Administrator Instrument Scientist and User accounts Remove instrument scientist and user accounts Overwrite or delete configurations saved by Administrators Inst Sci Users Open any saved configuration Create new configurations Edit configurations and save them under a different filename Minimise S E C I The Instrument Scientist accounts have the following privileges Overwrite or delete configurations saved by Instrument Scientists and Users Open any saved configuration Create new configurations Edit configurations and save them under a different filename Minimise S E C I The User accounts have the following privileges Overwrite or d
53. r as shown for module 1 below Figure 9 Location of the 120 diffraction detectors in module 1 The choppers typically run at a frequency of 25 Hz which allows a 4 A wide wavelength range to reach the sample with minimal contamination from other wavelengths The d spacing measured are given by Bragg s law A 2dsin0 and since the diffraction detectors are close to backscattering gt sin0 1 the d spacing is about half the neutron wavelength The range of d spacing measured with the choppers at 25Hz is thus about 2 A wide In order to measure a full range of d spacing to properly characterise the sample a series of runs are usually performed with an incremental increase of the chopper phasing The data from these runs are then merged in software to create a data set that spans the full range of d spacing of interest in a continuous manner The combination of a cold moderator and a super mirror guide provides a high flux of cold neutrons on OSIRIS However while neutron wavelengths of up to 70A re accessible 35A is the experimental limit The reduction in flux at long wavelengths is partly compensated for by the A form factor that applies to Bragg peak intensities The use of a super mirror guide significantly enhances the neutron flux at all wavelengths but at a price in beam divergence which increases substantially as a function of wavelength This is why the diffraction detectors on OSIRIS only cover the highest scattering angles where
54. remove a web viewer first select the Display page with the web viewer in Then select Web Viewers from the Configuration menu in the sub menu choose Remove Web Viewer From the dialog box select the web viewer to remove and click OK To remove this viewer permanently the configuration will need to be saved 53 SAVING VIEWING AND DELETING CONFIGURATIONS The options to save view and delete configurations are all grouped together under the Save Delete View Configurations option on the Configuration menu Choosing this will open a new window offering the choices for saving viewing and deleting configurations There are three different options for saving a configuration these are Save Current Config this will save the current configuration without changing the configuration name i e 1t will overwrite the configuration This is permission based for example a User use Save Current Config is the current configuration was created or saved by an Instrument Scientist Save Current Config As this will enable the current operator to save the current configuration under a different or new name Again this is permission based a User would be able to save a configuration under a new name but may not be able to save over an existing configuration Save As Other User this allows an Instrument Scientist or Administrator to save the current configuration as a lower permissions group For examp
55. rt groups the hours between 08 00 and 23 00 would probably be deemed reasonable 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 iii Is a 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 OSIRIS Sample Environment problems is always dealt with sympathetically and 1f appropriate the lost beam time will be is rescheduled at a later date 38 APPENDIX VI USEFUL TELEPHONE NUMBERS General Accident Emergency Fire 2222 Health Physics Radiation 6696 ISIS Main Control Room MCR 6789 OSIRIS Cabin 6896 Main gate Security 5545 Computer support 1763 Office numbers Dr Mark Telling 5529 Dr Vicky Garcia Sakai 6703 Dr Felix Fernandez Alonso 8203 Dr Franz Demmel 8283 39 APPENDIX VII USEFUL DIAGRAMS ij I Kelvinox Dilution Fridge Details 40 00 680 S00 1S EN LNSWNOYTANS 3 1
56. rt of the GENIE language and so make interpreting the language easier to program For example on VMS you could type CHANGE title something Works on old VMS system only This was possible because a separate program interpreted each command with the GENIE processor we need to tell it that title and something are not variable names Being more explicit in this way allows more complicated expressions to be written in the language For example in GENIE you can change both the title and user in one command as shown above In moving commands from VMS to the PC commands will usually become of the form name value A list of PC commands and their VMS alternative are tabulated below 63 PC Command syntax example Equivalent VMS Command Action CHANGE title String CHANGE title new title CHANGE title something CHANGE title new title Change the current run title CHANGE user String CHANGE user new user Changes the current user s CHANGE rbno Integer CHANGE rbno 1236 Changes experiment RB number UPDATESTORE CHANGE period Integer CHANGE period 2 UPDATE followed by STORE CHANGE period 2 Created a SAV file which is copied to the analysis PC WAITFOR uamps Real WAITFOR uamps 5 3 WAITFOR 5 3 uamps Sets number of uamps to wait for WAITFOR frames Integer WAITFOR frames 4000 WAITFOR seconds Integer WAIT 00 00 10 PC control waits for N WAITFOR
57. ted to give 10 2 2 2 2 2m 2 2m 2d where d is the d spacing of the analysing crystal The distance from the sample position to the detector bank 1 e the secondary flight path L5 is accurately known Consequently the time t it takes for a detected neutron of energy to travel a distance L be calculated using 2m L d sinO ty n 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 t t and by having accurate knowledge of 6 L and L the energy exchange within the sample can be AE p cia L LY 5 dE A m t 1 2 2 DIFFRACTION determined The diffraction detector bank on OSIRIS 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 directly 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 20 replacing the scattering angle shown in the Figure 4 A Li gt gt L Lut 28 gt 5 Lih Figure 5 A simple diffraction experiment 11 From equations 1 and 2 L h h m 6 t J 2d sinO where L is the total
58. ters the title of the current experiment CHANGE TITLE An OSIRIS experiment lt CR gt 2 7 2 BEGIN To start a run type BEGIN in the active Open Genie window After a few seconds the Dashboard should indicate that OSIRIS IS RUNNING and the total number of micro amps and the monitor counts will begin to increment 2 7 3 INSPECTING DATA To inspect a data set while it is still being collected use the data visualisation program OPENGENIE on the control PC Visualisation and simple manipulation of spectra is 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 18 For example to display the monitor spectrum of the data set being collected enter assign dae followed by display s 1 Alternatively to view spectrum 100 of a prior run type assign d users lt cycle number gt osi lt run number raw and the enter display s 100 The more common OpenGenie data manipulation commands are listed in 3 2 1 Alternatively the user can enter UPDATESTORE in the OpenGenie window This command suspends data collection by the DAE and copies the contents of the DAE to a file OSI S number where run number and number is incremented each time UPDATESTORE is issued during a measurement Data collection is then resumed and the file known as a SAV file is copied to the OSIRIS analysis
59. tion about MSLICE can be found at http www isis rl ac uk excitations index htm 27 ii IV REFERENCES PUNCH user guide R G Parry et al RAL Report RAL 88109 1988 GUIDE OSIRIS Data Analysis M T F Telling and W S Howells RAL Report RAL TR 2000 004 Jan 2000 http www dienst rl ac uk library 2000 tr raltr 2000004 pdf GSAS user guides software and information Attp public lanl gov gsas Cambridge Crystallography Subroutine Library CCSL information http www isis rl ac uk crystallography documentation CCSL CCSL guideFra mePage htm M T F Telling and K H Andersen Spectroscopic characteristics of the OSIRIS near backscattering crystal analyser spectrometer on the ISIS pulsed neutron source Phys Chem Chem Phys 7 1255 11261 2005 28 APPENDIX I QUASI IN ELASTIC SETTINGS Analyser Fwhm AE Freq Detector Mon Mon Phases Command ueV meV TCB TCB Bounds 063 010 us us us us 002 24 5 0 4 to 0 4 50 51500 0 45900 0 58732 0 8573 PG002 71500 0 65900 0 60732 0 14250 k 0 7 to 0 8 25 40200 0 36800 0 66177 0 6052 PG002 25Hz 80200 0 76800 0 68177 0 11250 i k 0 2 to 1 2 50 45500 0 40400 0 53055 0 7500 PG002 OFFSET 65500 0 60400 0 55055 0 12500 s 0 7 100 1 50 58700 0 52000 0 65545 0 9738 PG002 OFFSETI 78700 0 72000 0 67545 0 16166 k k s 1 0 to 0 1 25 57300 0 49400 0 64220 0 8964 PG002 OFFSET2 25Hz 97300 0 89400 0 66220 0 15211 s 0 1
60. ttings relative to t of the two disc choppers and b the time channel boundaries TCB s for data acquisition The procedure is the same for selecting a particular d spacing range when using the instrument as a diffractometer Common instrument settings can be found in the Appendix 17 along with corresponding chopper frequencies and phases These settings are loaded by typing single word commands also given in the Appendix in the active Open Genie 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 or Instrument Scientist 2 7 DATA COLLECTION 2 7 1 CHANGE INSTRUMENT SETTINGS As mentioned above single command words see Appendices are used to load the different parameters for different instrument settings 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 section 3 1 1 For example the following al
61. upon loading or to hide the panel The configuration will need to be saved to make this change permanent 50 REMOVING A LABVIEW PANEL FROM EXISTING CONFIGURATIONS To remove a Labview select Labview Panels from the Configuration menu and from the sub menu select Remove Labview Panel A dialog panel will open from this panel select the Display page from which the Labview panel will be removed and then select the VI to remove Click OK and the panel is removed from this instance of the configuration The configuration will need to be saved to make this change permanent CHANGING A LABVIEW PANEL S ASSOCIATED FILES From the Configuration menu select Labview Panels and then select Change Associated files from the sub menu A new dialog window will open from this select the Display page of the Labview panel to be edited and then select the actual VI It is now possible to add or delete the associated INI file for the panel To make any changes permanent the configuration will need to be saved MOVING A LABVIEW PANEL TO A DIFFERENT DISPLAY PAGE First it is necessary to select the Display page containing the Labview panel which is to be moved Then from the Configuration menu select Labview Panels and then select Move Labview Panel to Another Page from the sub menu The new window will list the Labview panels available in the selected Display page select the panel to move then choose which Display p
62. will now shutdown and restart in the new configuration This may take a minute or so ADDING A DISPLAY PAGE A TREE VIEW NODE To add a node to the tree view select Display Pages from the Configuration menu then from the sub menu select Add Display Page A New Display Page dialog form will now be shown The top list box shows the main nodes the new page will be a sub node of one of these nodes From the list of nodes select the required node next it is necessary to name the new sub node Finally it is necessary to choose the page type the options are VI this is short for Virtual Instrument this means the display page will be used for displaying Labview panels Web the page will be used for displaying web pages Other the page will be used other kinds of programmes Next click OK the new page should now appear as a sub node of one of the main nodes To make this change permanent the configuration will need to be saved 49 REMOVING A DISPLAY PAGE Firstly to remove a Display page it is necessary to remove any programmes see section 0 or Labview panels see sections 0 and 0 from the page first Then select Display Pages from the Configuration menu then from the sub menu select Remove Display Page From the new window select the display page to remove then click OK The page should now be removed to make this removal permanent it is necessary to save the configuration
63. y n is the number of scattering atoms per unit volume o is the average scattering cross section for the atoms in the sample and t is the thickness of the sample For example for a transmission of 85 scattering of 1596 ignoring absorption processes then 110085 no More specifically for polyatomic samples no njo n207 n303 However in many cases all atoms bar hydrogen may be ignored since H has by far the largest incoherent scattering cross section 13 Flat plate sample cans are sealed using either indium low temperature work less than room temperature 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 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 with exact back scattering being 180 with angles on the graphite side of the instrument are defined as being positive and the angles on the mica side are negative Which sample can orientation to use depends specifically upon the Q range and energy resolution required for the experiment Cases to consider are

The OSIRIS User Guide M.T.F.Telling and K.H.Andersen

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