User guide
Contents
1. 21 ampo 6 122 NTC m NTC mono in C 5 23 NTC a NTC analyzer in C 4 24 asImono Pt100 mono in C 3 25 _ Monitor _Monitor Detector 2 26 _ Seconds _Integration Time 1 Scattering angle Q relation and angular spacing of analysers Q nm 4u A sin 20 2 Table 1a Conversion factor angle gt nm wavelength and Energy for each reflections To use with the FOURC program Reflection Momentun Transfer Q Lambda X A Energy keV Si 777 140 26 nm sin 20 2 0 8959 13 840 Si 888 160 3 nm sin 26 2 0 7839 15 816 Si 9 99 180 35 nm sin 26 2 0 6968 17 794 Si 11 11 11 220 414 nm sin 20 2 0 5701 21 7477 Si 12 12 12 240 45 nm sin 20 2 0 5226 23 7246 Si 13 13 13 260 49 nm sin 20 2 0 4824 25 7017 Table 1b Conversion factor mm gt nm and Energy for each reflections To use with the HORIZONTAL program Reflection Momentun Transfer Q nm Energy keV Si 7 7 7 140 26 nm sin arctg x b555 2 13 840 Si 8 8 8 160 3 nm sin arctg x 5555 2 15 816 Si 9 9 9 180 35 nm sin arctg x 5555 2 17 794 Si 11 11 11 220 414 nm sin arctg x 5555 2 21 7477 Si 12 12 12 240 45 nm sin arctg x 5555 2 23 7246 Si 13 13 13 260 49 nm sin arctg x 5555 2 25 7017 Table 2 tth values corresponding at a Momentum Transfer Q 10 nm for each analyzers and each2. init val2 final val2 number of step2 init vain final valn number of stepn integration time Example scan from 80 to 80 meV with 0 5 meV step 1mn int time at the 999 reflection A 0 6968 A with TO 21 71 looks like horizontal T0 21 71 horizontal LAMBDA 0 69680026 just once after you have selected the mono reflection and determined the elastic temperature horizontal ascan monot 23 6 20 08 320 60 or horizontal ascan deltae 80 80 320 60 You can also type horizontal ascan monot TO 1 76 T0 1 76 320 60 10 Stopping a scan horizontal CTRL C Scanning or counting will be stopped If a dscan was running the motor will return to its initial position Running a Macro This is frequently utilised if a sequence of scans shall be performed once the measurement strategy has been defined 1 Edit modify the macro with the editor you like vi emacs nedit etc in the working directory The name of the macro first line must be the one of the macro file example name of the macro macfilename name of the file macfilename mac Example def res Si 11 11 11 file res230603 ANA2 amp ANA1 umv tth 581 umv ssy 0 5 ascan monot 21 65 20 57 216 50 umv monot 21 65 sleep 400 ANA4 amp ANA3 umv tth 276 umv ssy 0 30 ascan monot 21 65 20 57 216 50 umv monot 21 65 sleep 400 ANAS umv wheel 45 umv tth 48 5 umv ssy 2 4 umv wheel 0 ascan monot 21 65 20 57
3. 216 50 umv monot 21 11 2 Macro compilation horizontal qdo macfilename mac You can check the content of the compiled macro by horizontal prdef macfilename 3 Macro execution horizontal macfilename 11 Plotting data file in CPLOT This operation generates the standard output for the log book and it is highly recommended It makes it a lot easier to detect any potential bug in the spectrum and identify the problem if the key characteristics are printed out Start Cplot in the fourth window of the X Terminal cplot The Cplot macros are called rec do and quadro do for HORIZONTAL and vertical do for FOURC Output on printer for HORIZONTAL PLOT do recl do 1 2 3 4 1 4 filename 2 scan number 3 integration time momentum transfer Ana l in nm 1 PLOT gt do quadro do 1 2 3 4 5 6 1 filename 2 scan number 3 momentum transfer Ana 2 in nm 1 4 momentum transfer Ana 3 in nm 1 5 momentum transfer Ana 4 in nm 1 5 momentum transfer Ana 5 in nm 1 Output on printer for FOURC PLOT do vertical do 1 2 3 4 1 4 filename 2 scan number 3 integration time momentum transfer in nm 1 THINGS NOT TO DO 1 Move the spectrometer arm to small Q values where either analysers 1 2 or the S Q detector are close or in the direct beam or an intense Bragg reflection If this is necessary put by all means the absorber wheel
4. gt K AE m meV 5 3 4 4 2 2 1 02 0 73 0 5 AE E 3 8x107 2 8x107 1 2x107 4 7x10 3 0x10 2 0x10 Conversion 140 26 160 31 180 34 220 42 240 46 260 50 angles nm Flux ph s 200 mA 7310 6x10 1 8x10 4 4x10 3 9x10 9 8x10 22
5. of the check routines for the premono and the mirror horizontal kozon horizontal plotselect mon horizontal dscan mono 0 002 0 002 202 horizontal umv mono pl xMAX horizontal plotselect vdla horizontal dscan R2Th 0 0015 0 0015 202 horizontal umv mono pl xMAX Before setting the monochk routine you have to continue with the optimisation of the mirror roty and y otherwise the mirror optimisation will be hindered by the running monochk horizontal hexaon horizontal plotselect ione horizontal umv ilhgap 0 1 horizontal dscan y 0 5 0 5 30 1 horizontal umv y pl xMAX horizontal umv ilhgap 8 horizontal umv ilvgap 0 1 horizontal dscan roty 0 008 0 008 30 1 horizontal umv roty pl xMAX horizontal umv ilvgap 0 6 You have to check whether the mirror has really reached the optimum positions If this is not the case you have to try to optimise it by hand using small corrections of the order of the defined tweak value Now after the complete optimisation set first the monochk routine horizontal onmonochk 3 This activates the premonochromator mono control as well as the beam control Then set the mirrorchk routine horizontal onmirrorchk 3 This activates the mirror control Put the horizontal or vertical spectrometer arm to the correct scattering angle horizontal umv tth 658 the units are in mm Look at the table 1b at the end of the document for the
6. reflections os Si777 Si 888 Si 9 9 9 Si 11 11 11 Si1212 12 Si 13 13 13 1 9 754 8 730 7 934 6 777 6 3441 5 977 2 8 177 7 153 6 357 5 200 4 7671 4 409 3 6 669 5 645 4 849 3 692 3 2591 2 892 4 5 119 4 095 3 299 2 142 1 7091 1 342 5 3 5519 2 527 1 731 0 574 0 1411 21 Table 3 Relative tth angle between analyzers 1 2 3 4 5 1 E 1 577 3 085 4 635 6 203 2 TEOKS 1 508 3 058 4 626 3 3 085 1 508 A BEEN 3 118 4 4 635 3 058 1 550 s 1 568 5 6 203 4 626 3 118 1 568 Table 4 Maximum momentum transfer Qmax for the Horizontal and Vertical Spectrometer AQ indicates the Q spacing between adjacent analysers Horizontal Spectrometer Verica Energy Reflection Spectrometer keV order n E Qmax nm AQ nm Qmax nm 7 13 840 21 3 1 89 124 15 817 24 4 2 16 142 17 794 27 4 2 43 160 21 747 33 5 3 0 23 725 36 5 3 24 25 704 39 6 3 5 Table 5 High Resolution Si h h h monochromator and useful conversions Reflection 777 888 999 111111 121212 131313 Wavelength 0 895886 0 7839003 0 6968003 0 5701093 10 52260096 0 48240018 Energy eV 13839 35 15816 40 17793 45 21747 56 23724 57 25701 66 Conversion 0 02822 0 02470 0 02195 0 01796 0 01646 0 01520 meV
7. ID16 Beamline HORIZONTAL and VERTICAL SPECTROMETERS USER MANUAL TABLE OF CONTENTS euer T 2 The most Importalt molOotS cocooos ete tne enot pa pnr rein e Ra epa bro rus tpe setae heo Fes Reuter hup ku SR 3 Starting VOUr experiment soe e Eth o e bre a UR e reb teda E Re 4 Motor status moving motors and counting esesssssssssseseeeeeeee nee 4 Position of alignment pin diode and S Q detector 5 Put the horizontal or vertical spectrometer arm to the correct scattering angle 9 Put the Monochromator to the start temperature sssssssseeeeeeeeeennne 9 Doing a temperature Sar t ossi ri e Peta od oe poU EI Gedficu Meet nen qu 10 ejejee REO T 1 o LL D 11 PALIT PING a WAC re rc cC 11 Plotting data file in CPEOT iier te dta dames axe en en ce ev iR teenies 12 THINGS NOT TODO iori teet ie ie uto Cola esas poca at oto re aba I a d nea 12 SAVE DATA OF YOUR EXPERIMENT HH uus 13 Data conversion and analysis 3 5 etie vee chi Paty eee ena Ca do DD NE dudes 14 D3lasextEacllalic e cs Dei A AL E B NR RE Em e 14 Further raw data treatment and Summing of spectra sse 15 On line fitting UELLE PM E 17 Horizontal Control Program Columnist oops t tee coe eter rer etta eels 19 Fourc Control Program Column list 20 Table 5 High Resolution Si h h h monochromator and useful conversions 22 Computers Inel6 This is the experiment contr
8. _S k _ Alignment Diode end of the arm 29 5 _IONE _Ione Detector 28 6 _Det CH1 _Detector Sigl 27 7 _Det CH2 _ Detector Sig2 26 8 Det CH3 Detector Sig3 25 9 _Det CH4 _Detector Sig4 24 10 _Det CH5 _Detector Sig5 23 M Mono NTC n 1 mono in Q 22 12 _Tc mV NTC n2 mono in Q 2l 13 ana l NTC analyser 1 in Q 20 14 ana 2 NTC analyser 2 in Q 19 15 ana 3 NTC analyser 3 in Q 18 16 ana 4 _ NTC analyser 4 in Q 17 17 ana 5 NTC analyser 5 in Q 16 18 _VDL ANAL _Vdl 15 19 _Det Check 14 _20 _ VDL CORR 13 _21 Srcur 12 22 _Counter 21 11 23 Counter 22 10 _24 _Tone mon 9 25 _Diodo 8 _26 temp euro 7 27 _Moncur 6 28 asl 10 Pt100 mono in C 5 29 ntel NTC n 1 mono in C 4 30 Ntc2 NTC n 2 mono in C 3 31 _ Monitor _ Monitor Detector 2 32 _ Seconds _Integration Time 1 Fourc Control Program Column list from TEMPERATURE SCANS as of June 20 2003 20 _Col Counter name Counter meaning Inv d _monot monot setpoint in C 26 2 H 25 3 K 24 4 L 23 5 _Epoch 22 6 _ Signal Signal Back Detector 21 7 _Tmono NTC mono in Q 20 8 Tana _ NTC analyzer in Q 19 9 _VDL ANAL _Vdl 18 _10 _Det Check 17 11 _VDL CORR 16 12 _IONE _Ione Detector 15 13 Ione mon 14 14 _S k _S Q detector 13 15 _Diodo _ Alignment diode 12 16 Cryo T2 _ Si diode inside ST15 11 17 Srcur 10 18 moncur 9 19 _p_wika 8 _20 _volto 7
9. ackscattering reflection Bragg Reflection e g 999 Output file names Filenames have to be given for each analyser individually either under SCANS or under OUTPUT Selection of the analyser The analyser whose spectrum shall be treated has to be chosen by clicking on the corresponding button on the main panel The data treatment is done in 3 steps The described procedures have to be repeated for every spectrum and every analyser of interest Note that this procedure is indispensable even if you have only a single file In order to fit the data with minuit see below you need a file with a constant step in temperature energy 1 Determination of the elastic line The first step consists of determining the position of the elastic line corresponding to zero energy transfer The fitting is started by clicking on the taskbar button with two Gaussian like profiles which opens an additional window to first estimate the values of the fitting parameters and start the fitting itself By default the fits are done with Lorentzian function plus some background but other functions can be chosen from the menu The number of peaks is found automatically and cannot be changed even not by changing the type of fit function Note that only the Lorentzian fit results are taken into account automatically for the further treatment if the fits are done using other fit functions Gaussian Pseudo Voigt etc the values have to be entered ma
10. conversion a mm Q nm fourc gt umv tth 10 the units are in degrees Look at the table 1a at the end of the document for the conversion a degrees Q nm P Put the Monochromator to the start temperature Put a set point for the monochromator temperature by giving the values in degrees C to the pseudo motor monot as a normal motor positioning umv monot your set point e g horizontal umv monot 22 00 You have to wait typically 5 to 10 minutes until the setpoint is reached You can also give the values in meV using the pseudo motor deltae for doing this you have to enter the zero energy temperature setpoint horizontal TO0 actual average zero Temp and the wavelength you re using e g for the 999 reflection A complete list of the reflection orders and the corresponding wavelengths are given at the end of the document horizontal LAMBDA 0 6968 UPPER CASE for the variables it is case sensitive otherwise your deltae value see below does not make any sense Doing a temperature scan horizontal ascan monot init val final val number of step integration time Or horizontal rscan monot init vall final vall number of stepl init val2 final val2 number of step2 init vain final valn number of stepn integration time alternatively you can use the deltae motor horizontal ascan deltae init val final val number of step integration time or horizontal gt rscan deltae init vall final vall number of stepl
11. he data on line without interfering with the data acquisition Your local contact will create a directory where all the treated data as well as the results of the fits will be stored inelsun cd experiments inelsun experiments mkdir hsnnn inelsun experiments cd hsnnn Data extraction inelsun experiments hsnnn newplot 1 Using the file menu in newplot go into the corresponding data directory of your experiment data id16 inhouse data runN_yy hsnnn expNN 2 Open the file which contains all the spectra You have a list of all your scans you can visualise them and make some basic analysis 3 Set extraction script Depending on the type of scan horizontal or vertical spectrometer you have to choose the corresponding extraction script which extracts the relevant columns out of the data file and performs the conversion of resistance of the temperature sensors into temperature Click on the button Standard on the bottom right part of the left panel and choose Set Script Goto the users opidl6 Swadd script and choose the appropriate script Horizontal for standard IXS scans with the horizontal spectrometer Vertical for standard IXS scans with the vertical spectrometer 4 Selection of the scans to be extracted When you have chosen which scans you are interested in select them by clicking left button on the little arrow on the left of the scan name or select them and click on the select button Then push the ex
12. in horizontal umv wheel 315 270 but not less than 270 this will saturate the detector 2 Move the sample angle theta th or sth to high angles or spectrometer arm to large scattering angles tth since you might hit into the sample vacuum can Visual inspection is indispensable Be as well careful when moving sample tilt angles phi chi by larger amount there is very little space available around the sample position The sample chamber may run into surrounding equipment or parts of the instrument detector chamber For any problems phone your local contact or the Experimental Hall Operators 25 25 12 SAVE DATA OF YOUR EXPERIMENT 1 1111 Put your data on your user account 1 month lifetime Connect on NICE Solaris or Linux system using the name of your experiment typically HSXXX and your password initial of the name of the first applicant followed by the family name e g experiment HS123 first applicant Mr H Gbhkds telnet or ftp nice login hs123 this is case sensitive password hghs123 Then transfer the data home using ftp out or telnet out literally type ftp out or telnet out then follow the instructions For any computing problem phone to the 24 24 computing hot line 7 a m 8 p m 13 Data conversion and analysis On the data treatment analysis computer inelsun the data directory of inel6 is mounted directly read only with all your data in real time In this way you can analyse t
13. ing lines are standard commands to execute the minuit libraries minimisation the only ones you need to specify is the FIX line put 1 FIX line for each parameters you want to minimise with the number of the parameter 1 for BG 3 for ZR and so on If you need to fit your data file with other models see visco elastic or fit your data file with more than one excitations ask directly to your local contact 2 Running the fitting program minuit name file inp example minuit min inp 3 Plotting the result of the fit The results of the fit can be visualised and printed using CPLOT with the CPLOT macro generated by minuit with the name you put on line 5 of the input file e g on CPLOT PLOT gt do cpfilename do To print modify the CPLOT macro putting the zi x11 statement in comment zi x11 and run the macro again To be able to use any other software to visulize the fit curves here the description of the columns in the fit output ASCII file the filename is defined in the 2 line of the input file 1 col Energy transfer 2 col data 3 col error bar of data 4 col total fit sum of all contributions 5 col fit of the exitations DHO model or lorentzians 18 Horizontal Control Program Column list from TEMPERATURE SCANS as of Jan 30 2003 19 _Col Counter name Counter meaning Inv d Monot monot setpoint in C 32 2 _Epoch 31 3 _S q Det 30 4
14. isplay comments on the tasks for the centring summing up saving into the file etc To be able to use other software to continue to treat these summed up data here the description of the columns in the squadd output ASCII file 1 col energy tranfer 24 col counts normalised to the average monoitor 3 col error bar for col 2 4 col unknown porpose 5 col original counts as summed up 6 col summed up monitor from the ione monitor in the SPEC datafile 7 col error bar for col 5 16 The fitting is done in your analysis directory users opid16 experiments hsNNN For fitting with the minuit library called by the program minuit n excitations Lorentzians or damped harmonic oscillators you need a file with a constant step in temperature energy so you have to use sqwadd beforehand even for one single scan You need the summed data and the actual resolution function files ask the local contact and to prepare an input file for each scan you want to analyse On line fitting with minuit 1 Preparation of the input file Copy the standard input file min inp for minuit on inelsun in users opid16 usermacros to your directory users opidl6 experiments hsnnnn Copy the resolution file ask to the local contact the names of the resolution files in the resolution directory users opidl6 resolutions to your directory users opid16 experiments hsnnn The format of the input file is as follows 1 line 2
15. line 3 line 4 line 5 line 6 line 7 line g 03 g 03 outo alres11 dat DHO 80 3 MINU SET SET FIX SEEK SIMP 003 003 3g do IT 00 1001 50 PN rn PRInt ERRdef LEX MIGRAD HESSE I EXIT Q AoOVATVTANNYDW PrRrerereaagawWe data input file fitted output file file do for c plotting resolution file fitting model temperature momentum transfer 12 01 000 0001 0 008 001 T sk 21 10 0 28 01 10 0 01 6 07 0 01 1 04 0 10 name of data file input data name of output file containing the experimental data and the fit name of the C PLOT do file with which one can visualise and print the results file of the experimental resolution function with which the model function is convoluted fit main model used dho Damped Harmonic Oscillator lor Lorentzian functions temperature in degree Kelvin real number momentum transfer in nm 000001 0 2 2 000001 10 001 000001 001 000001 17 50 0 2 2 10 220000 10 2000 9 0 10 The meaning of the fitting parameters is as follows BG background SL linear slope of the background ZR energy position of the elastic line GR only used if one convolutes with a Lorentzian function otherwise has to be kept fixed PC central line intensity GC central line width PL 1st phonon line intensity OL Ist phonon line energy GL 1st phonon line width The follow
16. ment of the beam Specific motors HORIZONTAL FOURC Control Program Control Program sth mm tth deg 2 theta arm of spectrometer operates only towards positive values sample rotation around the y axis perpendicular to sii ides th deg incident beam axis acw looking towards ring wall ax mm esse mm Move in and out of the beam the S Q detector Sample motors HORIZONTAL FOURC chi deg sample rotation around incident beam axis cw looking towards undulator source phi deg sample rotation around the z axis perpendicular to incident beam axis acw birds view sax mm sample translation along beam direction x axis for sth 0 or th 0 towards the spectrometer say mm sample translation along the y axis towards ring wall saz mm sample translation along the z axis for sth 0 or th 0 downwards Additional necessary motors HORIZONTAL FOURC ilhof mm horizontal offset of slit system defining beam size on sample ilhgap mm horizontal gap of slit system defining beam size on sample ilvof mm vertical offset of slit system defining beam size on sample ilvgap mm vertical gap of slit system defining beam size on sample wheel deg Attenuation wheel increasing attenuation with increasing motor position 45 90 135 180 225 270 315 No attenuation wheel 0 ssy mm towards experimental hall Horizontal translation of entrance pinhole It has to be aligned carefully bef
17. ment purposes see separate manual Pc2id16 This PC is utilised for further data display such as stacks of IXS scans dispersion curves etc Id16pc1 same as Pc2id16 but located in CC3 The most important motors On the ID16 beamline for the collective excitations studies are operating two different spectrometers with different characteristics The two spectrometers can not be utilized simultaneously consequently one of the two have to be taken apart The HORIZONTAL Control Program controls the horizontal spectrometer and the FOURC Control Program controls the vertical spectrometers The two Control Programs share some motors that can have different names In the following list it will be specified when the name change or when a motor appear in one program only General control motors HORIZONTAL FOURC mono degree main theta axis of Kohzu premonochromator Make the rotation of the two Si 111 crystals and the translation of the second crystal This is usually set and needs only to be tweaked if the ratio monocur vdlacur is not ok see further below R2Th degree Rotation of the second Si 111 crystal This has to be adjusted from time to time see monochk macro roty mrad mirror angle This needs to be tweaked if the intensity ratio ione vdlacur or ione i10 is not ok see further below y mm movement of the mirror perpendicular to beam direction This has to be adjusted when there is a consistent horizontal move
18. monochromator and the mirror are optimised Before starting an inelastic scan you have to make sure that the premono angle mono or R2Th is optimised with respect to the backscattering monochromator correct value of monocur vdlacur Furthermore the mirror angle roty might need an optimisation so that the focussed beam is properly centred through the ione slit unit correct value of monocur vdlacur or ione mon To scan these motors for optimisation the monochk and mirrorchk routines have to be deactivated if there were active or alternatively be set up properly Set up of mono check routine horizontal offmonochk horizontal monochksetup A menu appears on the screen MONOCHK SETUP mono monitor counter mnemonic monocur high threshold 90 type integrating machine current counter mnemonic vdlacur low threshold 10 type integrating sleep time after beam is back 300 lineup R2Th 0 002 0 002 20 3 mono motor mnemonic R2Th tweak value 0 0002 scan magnitude 0 002 scan intervals 20 scan integration time 1 line up at PK plot filter 1 lineup R2Th 0 01 0 01 40 1 pre scan magnitude magnitude after beam loss 0 01 pre scan magnitude intervals after beam loss 40 The lowest level of check is associated with the presence of the x ray beam on the premono If the beam is gone the spectrum stops automatically detects when the beam is back and waits the predefined sleep time after the beam is back It then perform
19. nually If the number of peaks offered is not at all convenient the zero energy transfer can also be estimated with help of crosshairs to be found in the GRAPH pull down menu and the value found can then be entered manually At the end of the procedure the column SHIFT in the sheet SCANS should contain the correct value by which the spectrum has to be shifted in order to have the elastic line centred at zero 2 Centring of the spectrum The centring of the spectrum is done by clicking on the taskbar button showing a profile with crosshairs or by choosing the CENTER item in the pull down menu The procedure consists to shift the spectrum by the chosen amount and interpolate the 15 spectrum in order to obtain an equally spaced grid on the x axis This is necessary if the data shall be fitted with minuit 3 Summing the spectra The third taskbar button displaying a profile with a symbol then sums the highlighted spectra together converts them into an energy meV scale and saves the results under the filename given OUTPUT or Output File Name If you have prepared as described above the spectra for all analysers and have defined all filenames for the results you can do the summing up by only clicking on the SUM ALL button instead of doing the summing up for each analyser individually sqwadd itself will not display whether or not it performed the tasks but the window where you started the tool will d
20. ol computer It runs the experiment control programs FOURC and HORIZONTAL The first workspace is dedicated to the control of the main mono mirror primary and secondary slits the users are not concerned In the second workspace should run the Control Program Horizontal or Fourc The third workspace is utilised to prepare macros to run a suite of IXS scans The last workspace should have two panels open One for editing the routine output CPLOT macro and the second window to execute the macro You should not attempt to start more applications or do whatsoever what is the scope of this computer in order to avoid any potential overloading of this most crucial computer Inelsun This is the data analysis computer An image of the data files on inel6 are automatically created on inelsun This serves as a back up and allows to work on line with the data Here newplot and sqwadd are running as well as the relevant fitting programs Experiment control computer inel6 login opid16 password tonic16 working directory data runN YY HS ABCD Data analysis computer inelsun login opid16 password tonic16 working directory experiments hsabcd Inel2 This computer runs the beamline control applications such as the Front End application and the Vacuum application Nothing else should be running on this computer Pacifico This PC is dedicated to the recording and diagnostics of focal spot images and the SensiCam images for crystal align
21. ore each experiment SSZ mm vertical translation of entrance pinhole upwards Additional necessary motors HORIZONTAL only a2hof mm horizontal offset of analyser slits for ana 2 a2hgap mm horizontal gap of analyser slits for ana 2 a2vof mm vertical offset of analyser slits for ana 2 a2vgap mm vertical gap of analyser slits for ana 2 alvgap mm vertical gap of analyser slits for anast1 alhgap mm horizontal gap of analyser slits for ana 1 Additional necessary motors FOURC only hof mm horizontal offset of analyser slits hgap mm horizontal gap of analyser slits vof mm vertical offset of analyser slits vgap mm vertical gap of analyser slits Starting your experiment Your local contact will set the name of the experiment directory and the name of the experimental file This is usually only one file where each scan has an increasing number within this datafile Example filename exp102 scan ZS 5 Motor status moving motors and counting N B The same commands are valid also in fourc gt horizontal wa shows all the motor positions horizontal wm motor name shows the position of the particular motor horizontal ct n counts for n seconds horizontal umvr motor name change of actual position relative movement with respect to actual value motor moves back to initial position afterwards Example umvr tth 0 5 horizontal dscan motor name rel change rel change numbe
22. r of points counting time scan around actual position motor remains at end position Example dscan say 1 1 20 1 horizontal ascan motor name start value end value number of points counting time scan from actual position to end value Example ascan say 2 5 301 For sth or th and tth the scans should be done from large to small angles in order to avoid the backlash movement for each point Be careful when moving these motors over large distances Pieces of equipment or the sample chamber might be in the way and might get damaged Position of alignment pin diode and S Q detector Horizontal Control Program Pin Diode Detector diodo in direct beam at tth 2 48 07 3 2003 horizontal umv tth 48 This value may vary For the exact position ask your local contact N B be sure that the S Q detector is out of the beam horizontal umv ax 5 S Q Detector S Q Detector in direct beam at tth 0 horizontal umv tth O0 horizontal umv ax 46 S Q detector in horizontal umv ax 5 S Q detector out This value may vary For the exact position ask your local contact Fourc Control Program Pin Diode alignment is not installed S Q Detector S Q Detector in direct beam at tth 0 horizontal umv tth O0 horizontal umv esse 29 S Q detector in horizontal umv esse 2 S Q detector out This value may vary For the exact position ask your local contact Make sure that the pre
23. s a pre scan of the premono followed by the line up scan after which the intensity ratio monocur vdlacur should be optimised If during a scan the ratio monocur vdlacur drops below 9096 of the initially optimised value the mono performs a small correction to both sides in order to improve the monocur vdlacur ratio Set up of mirror check routine horizontal offmirrorchk horizontal mirrorchksetup A menu appears on the screen MIRRORCHECKSETUP SETUP mirror monitor mnemonic 110 threshold 90 type analog roty scan counter mnemonic ione lineup roty 0 02 0 02 20 1 mirror motor mnemonic roty roty tweak value 0 002 scan magnitude 0 02 scan intervals 20 scan integration time 1 line up at CEN This check routine makes sure that the beam is always properly steered through the ione slit unit This unit accommodates the last set of slits before the sample For small samples and high pressure experiments the vertical slit ilvgap is put to 100 um typically and during an IXS scan the mirror needs to be adjusted from time to time If the intensity ratio ione vdlacur or ione mon drops below 90 of the initially optimised value a small angular correction defined by the tweak value is performed If the beam is lost first the monocheck routine is executed then the mirrorcheck routine It consists of a line up scan after which the mirror is positioned at the maxiumum of the ione vdlacur signal Activation
24. tract button on the bottom newplot then extracts the chosen scans into separate files expN nscan nscan number of the scan with the following columns If you use Horizontal Monitor Ione Tmono AT anal mono AT ana2 mono ATs detal deta2 deta3 deta4 deta5 S Q det If you use Vertical 14 Monitor Ione Setpoint AT ana mono Tana Tmono AT ana mono AT ana mono Signal Ione Signal Signal Signal Signal Signal Further raw data treatment and summing of spectra sqwadd is a tool to prepare IXS spectra for further fitting after they have been extracted from the standard SPEC data file extraction done via newplot It allows to display and inspect the individual spectra of each scan and each analyser e g to compare repeated spectra centre the individual spectra by pre fitting them sum together several spectra repetitions or extensions of spectra and save the spectra or sums of spectra converted from a temperature axis to an energy axis sqwadd has to be started in the directory where you have saved the extracted file the tool will save the results in this same directory e g on inelsun esrf fr experiments HS2000 The tool opens in a window offering pull down menus as well as click buttons for the tasks to do Load data files menu FILE OPEN and load the data to be treated together Choice of reflection order Choose the correct incident photon energy by selecting the corresponding correct b
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