Optical Synchrotron Radiation Diagnostic Beamline Manual
Contents
1. 7 9 79 1 Rev 7 3 0 USER S GUIDE 3 1 HOW TO SET UP THE OSR OPTICAL CHICANE On the control screen select CLS Logo Storage Ring OSR Diagnostic Beamline and click on the Optical Chicane tab o r L LET a E ETE EL Main edl Vacuum valve Primary mirror vical OPEN i i Y Position A oss ore Close GOOD Yy interlock i Focusing lens mm actual Z q 69 993 primary mirror 30 9 deg C Photon shutter cavity temperature Y OPEN 28 6 deg C interlock XY A usin X Ae lt gt Secondary mirror Horizontal slits X actual Vertical slits Y actual Y Positi 0 003 anon gap 22 003 gap 30 000 A 30 001 A be Yy Y Rotati 0 000 otation 0 000 nue ja P ooo center A 5 001 lt lt gt X Rotation y Fig 2 The optical chicane control window showing the nominal settings for all optical elements All the settings should be as shown in Fig 2 otherwise correct the settings that are wrong Open the vacuum valve first and then the photon shutter Use the CCD camera as a reference for aligning the beam Note The settings in Fig 2 provide a good starting point but in all likelihood will not steer the beam into the active area of the CCD camera Click on the OSR Optical Table tab The window shown in Fig 3 will open 2015 05 12 Optical Synchrotron Radiation Diagnostic Page 11 Beamline Manual 7 9 79 1 Rev 7 _ home control opi DiagnosticBeamlines OSR_ Beamline Main2. using the CCD camera 2015 05 12 Optical Synchrotron Radiation Diagnostic Page 16 Beamline Manual 7 9 79 1 Rev 7 Select Options Computations and set the configuration shown in Fig 7 Computations 0 000e 00 Clini Peltier Whole Beam Focal Length fo ete ririri flit Se Fig 7 Configuration of the Computations window for the CCD camera 2015 05 12 Optical Synchrotron Radiation Diagnostic Page 17 Beamline Manual 7 9 79 1 Rev 7 Select Options Beam Display and set the configuration shown in Fig 8 Curser Orientation may be set as desired Beam Display 2D only TA Beam view 2D gt 3D Cancel Cursors Centroid hi l Crosshair Manual T Cursor Orientation Major Minor ii Grid Origin Location window UL Gn Help Beam Colors Color Continuous Z Asis Scale w e Cursor Profiles aD only Wins Priv e Cross Hatch Beam Display Current Alone Set Reference Source Current ae _ Contour Display Thresholds Lower 0 000e 00 a Tilt Upper 1 023e 03 Wire Density 51 2 400 Rotate Color Bar Fig 8 Configuration of the Beam Display window for the CCD camera For a proper measurement of the beam size and position it is important to subtract the background light To start this background subtraction close the table photon shutter see Fig 3 and click Ultracal in the Spiricon window Open the table shutter agai
3. 123 4 Td 10 13 16 19 Bunch bt tt ttt tt ttt ttt ttt ttt 02 4 6 12 18 24 30 36 t ns Fig 1 The Synchroscan Sweep Unit sweeps vertically at a frequency of 166 7 MHz while the Dual Timebase Extender Unit see 2 7 4 3 applies a linear horizontal sweep Only bunches 1 4 7 are displayed on the screen in graph a If the 166 7 MHz signal is delayed by 2 ns bunches 2 5 8 are displayed b If the signal is delayed by 4 ns compared to a bunches 3 6 9 are displayed c If the signal is delayed by 3 ns compared to a all bunches are displayed on the down stroke d rather than the up stroke Note that no Synchronous Blanking Unit is needed since there is no light hitting the camera during sweepback 2015 05 12 Optical Synchrotron Radiation Diagnostic Page 8 Beamline Manual 7 9 79 1 Rev 7 2 7 5 2 M5677 Slow Speed Sweep Unit The Slow Speed Sweep Unit is used to paint entire bunch trains The unit is triggered by a signal that is derived from the storage ring synchronous trigger The maximum trigger rate that the Slow Speed Sweep Unit can accept depends on the sweep speed setting Trigger signals that arrive during the deadtime are ignored However unless the vertical trigger rate is an integer multiple of the horizontal trigger rate the image produced by the camera walks horizontally A pre scaler BL EE DIAG 0106150 is therefore used to set the trigger rate low enough so that all triggers are accepted by the Slow Spee
4. Optical Synchrotron Radiation Diagnostic Beamline Manual 7 9 79 1 Rev 7 Date 2015 05 12 Copyright 2015 Canadian Light Source Inc This document is the property of Canadian Light Source Inc CLSI No exploitation or transfer of any information contained herein is permitted in the absence of an agreement with CLSI and neither the document nor any such information may be released without the written consent of CLSI Canadian Light Source Inc 44 Innovation Boulevard Saskatoon Saskatchewan S7N 2V3 Canada Signature Date Original on File Signed by Author Staff Scientist Instrumentation Reviewer 1 Accelerator Physicist Reviewer 2 AOD Manager Approver CID Manager The current version of this document is accessible under the Approved Documents section on the CLSI Team Site Employees must verify that any printed or electronically downloaded copies are current by comparing its revision number to that shown in the online version 7 9 79 1 Rev 7 TABLE OF CONTENTS CO IATKOGUGHION asisas eh essahewen ese asaky 1 Tet Purpose QING SCOPE seoser na 1 Tee BACK OUNO ra rr T 1 1 3 Definitions and Abbreviations ccccccccceccsecceeceeeeeeeeeeueeeeeeeeaeeeseeesueeseeenees 1 20 DESC ON ex severe nessessrAorass esas ata e aac aeuaees 2 2 1 Vacuum Machine Protection ccccccccscccececececeeecseecececeeecseeceeeseeesseenseeses 2 22 SOURCE Olle aana E 2 ZrO TeMOl Mis UMC laces kat the
5. 6A 2015 05 12 Date 2002 10 29 2003 03 18 2003 09 25 2006 05 16 2006 05 30 2008 10 09 2008 11 04 2009 09 11 2009 09 22 2010 02 11 2010 02 16 2013 05 15 2013 05 30 2014 03 18 2014 04 01 2015 04 20 2015 05 12 REVISION HISTORY Description Initial Draft Amended Draft Issued for Use as Requirements Document Draft Manual Issued for Use as Manual Added description of fast steering mirror line updated control screens Issued for Use Updated description of fast steering mirror Issued for Use Added sections 3 4 and 3 8 Issued for Use Updated description of motor controls added fill pattern monitor Issued for Use Updated User s Guide with instructions for new version of streak camera software Issued for Use Added section 3 11 9 Issued for Use Optical Synchrotron Radiation Diagnostic Beamline Manual 7 9 79 1 Rev 7 Author J M Vogt and R Berg M McKibben M McKibben J M J M J M J M J M J M J M J M J M J M J M J M J M J M Vogt Vogt Vogt Vogt Vogt Vogt Vogt Vogt Vogt Vogt Vogt Vogt Vogt Vogt Page 47
6. Active Integrate after trig Fig 22 The Analog camera acquisition control window showing the most common configuration The number of frames may need to be changed depending of the horizontal sweep see 3 11 2 2015 05 12 Optical Synchrotron Radiation Diagnostic Page 32 Beamline Manual 7 9 79 1 Rev 7 The settings in the C5680 M5675 control window depend on the kind of measurement that is to be made Fig 23 gives a good start for measuring the bunch length P 75680 M5675 control 3 Parameter name Parameter value A 4 5 z 4 Gate Time i 4 ont a a in a T 4 nn a gt 4 Fig 23 The camera settings most commonly used to measure the bunch length in the storage ring Time ranges 2 3 and 4 have been calibrated at CLS using a 117 ps optical delay line These calibrations are inconsistent with the ones given by Hamamatsu Time Range Calibration Full Scale ps ps pixel Approx 150 re E es a 2015 05 12 Optical Synchrotron Radiation Diagnostic Page 33 Beamline Manual 7 9 79 1 Rev 7 3 11 2 Horizontal Sweep when Using the M5675 Synchroscan Sweep Unit The Streak Camera Synchronizer module synchronizes the horizontal trigger and the frame grabber trigger with the CCD frames of the streak camera This scheme only works as long as the internal pre scaling of the trigger input of the M5679 Dual Timebase Extender Unit is not activated
7. The Streak Camera Synchronizer module has a built in pre scaler the ratio of which is selected by the Frame Rate Divider knob If the Knob is set to 9 the camera will work at all horizontal sweep speeds However for most of the sweep speed settings the frame capture rate will be slower than necessary The following table shows the minimum frame rate divider settings for the various horizontal sweep speeds when using the M5675 Synchroscan Sweep Unit Horizontal Sweep Frame Rate Divider toms s8 gt o aor 50 ms 3 00 Hz 50 ms 5 00 Hz 20 ms 6 00 Hz 20 ms 7 49 Hz tem e L o 7 49 Hz 10 ms 7 49 Hz lt 5ms 9 99 Hz Taal G 9 99 Hz The number of frames in the table is the minimum that must be selected in order for the image to cover the entire screen Greater numbers may be selected as shown in some of the entries but the maximum allowable frame rate will be affected To change the number of frames click the Live tab in the Analog camera acquisition control window Fig 22 click Freeze if the acquisition is running and select the number of frames in the Integrate after trig field Note If the frame rate divider is set too low the internal pre scaling of the camera trigger is automatically activated The camera may work for most of the time since failures tend to be sporadic However the image may flicker or may suddenly disappear for no obvious reason In Fig 24 every third bunch
8. ON THE OPTICAL TABLE The optical table is a metric table 1 2m 2 4m with M6 holes on a 25 mm grid It is equipped with four detectors The layout of the detectors is captured in drawing 02B1 2 ME OPT 009400 2 1 CCD Camera The CCD camera is a COHU Model 6612 3000 configured for interlaced mode with a shutter soeed of 1 60 s The video signal is distributed to e Avideo monitor located in the OSR hutch e A video to Ethernet adapter which is used to make the image available on a web page and on the facility monitors e A fibre link to the control room e A frame grabber in the OSR hutch The digitized images from the frame grabber are analyzed by a software package called Spiricon Although the computer running Spiricon is located in the OSR hutch it can be accessed from the control room via a KVM extender The wiring of the CCD camera is shown in 02B1 2 EE WIR 0090780 2 7 2 CCD Camera in the FSM Line An identical CCD camera is mounted in the FSM line It uses the same readout as described in 2 7 1 the video signal cable is moved between the two cameras 2 3 Position Sensitive Detector in the FSM line The detector is a Hamamatsu Model 1300 duo lateral super linear position sensing detector mounted on a C4757 signal processing board It is used to provide position feedback to the fast steering mirror controller 2 7 4 Intensified CCD ICCD The intensified CCD ICCD camera provides bunch by bunch or single bunch position an
9. Radiation Diagnostic Page 41 Beamline Manual 7 9 79 1 Rev 7 3 11 8 Display Options Select Display LUT to open the LUT parameters window Fig 34 Choose the desired display options LUT pararneters Color BAN Rainbow BAN without using color for overflow Inverted LUT Display neg values Shift 0 LUT Type Gamma 4 di Linear Gamma sigmoid Fig 34 The various display options in the LUT parameters window 3 11 9 Injection Studies with the Streak Camera in Synchroscan Mode Some changes need to be made to the wiring of the camera in order to trigger the camera with the SR injection trigger and to synchronize the frame grabber with the acquired images The following is a non standard configuration Return the wiring to the normal setup when the injection studies are finished e On the Streak Camera Synchronizer module in NIM1602 1 01 move cable C54977 from TTL OUT to TTL OUT e Remove C77579 from the TRIGGER INPUT of the synchronizer module and connect C103068 in its place The frame rate is 0 5 Hz no matter how the FRAME RATE DIVIDER is set Note There is a divide by 2 at the output of the synchronizer Therefore the camera is triggered at 0 5 Hz i e on every other trigger In the Analog camera acquisition control window set Integrate after trig to 1 frame Fig 22 2015 05 12 Optical Synchrotron Radiation Diagnostic Page 42 Beamline Manual 3 12 7
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11. are Melles Griot absorptive neutral density filters with a diameter of 25 mm and various optical densities 2 6 5 Focusing Lenses There are 7 focusing lenses on the optical table all of them achromatic doublets with a diameter of 50 8 mm The FSM line uses point parallel point optics with two Newport PACO91 lenses f 500 mm The ICCD line uses point to point optics with either an Oriel 42640 lens f 160 mm fora magnification M 4 or a Newport PACO88 lens f 250 mm for a magnification M 1 moved into position with pneumatic lifters The streak camera line uses a fixed Newport PACO94 lens f 750 mm point to parallel and either a Newport PACO89 f 300 mm parallel to point magnification M 0 4 ora Newport PACO086 f 150 mm parallel to point magnification M 0 2 These two lenses are mounted on pneumatic lifters 2 6 6 Dove Prism The vertical sweep of the streak camera draws a top view of the beam In order to allowa side view of the beam a dove prism is moved into the optical path The dove prism is a Melles Griot 01 PDE005 2015 05 12 Optical Synchrotron Radiation Diagnostic Page 5 Beamline Manual 7 9 79 1 Rev 7 2 6 7 Bandpass Filters There is a Melles Griot O3FIBO06 bandpass filter in front of each camera The filters have a FWHM of 80 nm and are centred at 500 nm The filter diameter is 50 mm 2 6 8 Fast Steering Mirror The fast steering mirror is a Newport FSM 320 01 with a diameter of 50 8mm 2 7 DETECTORS
12. click the button to enable histogramming of the light intensity in this region of interest as shown in Fig 31 Live 0 Zoom x1 Fig 31 Histograms of the light intensity in the regions of interest 2015 05 12 Optical Synchrotron Radiation Diagnostic Page 40 Beamline Manual 7 9 79 1 Rev 7 To perform a more detailed profile analysis click the button and draw a 2 dimensional region of interest Fig 32 Live 0 Zoom x 1 2 X 5 Fig 32 2 dimensional region of interest for detailed profile analysis Click on the amp button The Profile control Profile Display and Profile Analysis windows will open Fig 33 As an example click Get H in the Profile control window then click MO and check Auto update Profile control as al Profile Analysis x a7 Cursor1 0 7 55 Cursor2 0 Difference 0 Hide Show Del Reca Info Zoom Da Memory MO Il Value at Cursor1 8 20 mo m1 m2 m3 m4 ms me m7 ma Mo Value at Cursor2 8 20 E Color Type FWHM Auto update 7 Lifetime 1 e Risetime 10 90 Falltime 90 10 Maximum a Profile Display Location of Max Ss amp amp A 0 10 20 30 Integral Center of Gravity we ee 95 10 T E 3 a c rl Location J Fig 33 The Profile control Profile Display and Profile Analysis windows 2015 05 12 Optical Synchrotron
13. edl 0 Sse oon Ss _ PaPanensnr Vacuum valve Chicane Photon shutter eta Mata OPEN OPEN 30 8 deg Cc OSR O e arena ices tical Table one Tap 28 6 deg C interlock interlock DOVE PRISM STAGE NDF1602 1 B15 01 LENS1602 1 B12 01 LENS1602 1 B12 02 0 fc i J M 0 4 M 0 2 ar ia f 300 f 150 M 0 4 as f 300 f 150 NDF160221 B16 01 OD 4 op4a J o fe bel ye LENS1602 1 B13 01 LENS1602 1 B13 02 TABLE ee aa ML NDF1602 1 B13 01 PHOTON sail Fi s SHUTTER OUT aa OD 4 __ OPEN G i i P a 2 a L AN o o A Ge i L ol 1 ol J L a wo yrl i pgg BE IN z IN ove Be o Sara CLOSED Fig 3 The OSR Optical Table window The table photon shutter is open and filter wheel B14 01 in front of the CCD camera is set to OD4 In the ICCD camera line at the bottom both lenses are out and filter wheel B13 01 is set to OD4 In the streak camera line the dove prism is out both lenses are out and filter wheel B15 01 is set to OD4 Filter wheel B16 01 of the FSM line is set to OD4 The fast steering mirror is shown out of the beam but it would be moved in manually when the FSM line is used Select a reasonable OD setting for the CCD camera Beam in the Storage Ring Optical Density 1mA 100 mA 200 mA Open the table photon shutter If the beam spot does not appear on the video monitor close the table shutter again and look at the upstream side of the table shutter There is a lab
14. high count rates to minimize the statistical error after accumulating for a limited amount of time and running at low count rates to minimize the distortion of the fill pattern due to dead time effects To minimize dead time effects the count rate should be no more than 100 kHz for multi bunch fills or no more than 10 kHz for single bunch few bunch fills while the fill pattern is acquired for 60 seconds before being reset automatically Since the APD will suffer radiation damage in the long term the count rate should be set to about 10 kHz for multi bunch fills unless the statistical error of the acquired data is of particular concern To adjust the count rate of the APD click on the SR1 FillPatternAbsorber tab to switch to the SR1 Fill Pattern Monitor Absorber Motor screen Fig 37 and adjust the absorber position setpoint as needed 2015 05 12 Optical Synchrotron Radiation Diagnostic Page 43 Beamline Manual 7 9 79 1 Rev 7 home control opi DiagnosticBeamlines OSR_Beamline_Main edl pci sto senna Integration Automatic i i jee Delay between Integration Controls a Mode Mode Time a scans mos fen oan counts a a ee 12000 100 150 a Counter Histogram FQCI602 102 To Integrate buty del Saves FillPattemABCD to your home oe 68 968 kHz 0 9653 Fig 36 The FillPatternMonitor screen in the usual configuration accumulating the fill pattern for 60 seconds before resetting automatically The fill pattern is displayed li
15. mode Therefore the system will automatically reset itself after the beam in the storage ring trips or after the light to the PSD is blocked The beam current at which the threshold is crossed depends on the slit settings in the optical chicane If the nominal slit settings are used see Fig 2 the threshold is at a beam current of approximately 8 mA at 2 9 GeV 3 10 HOW TO SET UP THE STREAK CAMERA Although the streak camera can be controlled remotely from the control room some initial checks are required in the OSR hutch before the camera can be used 2015 05 12 Move the PSD out of the beam if necessary Move the dove prism out if necessary see Fig 3 Set the vertical slit of the streak camera to 300 um and open the horizontal aperture completely This operation is done manually at the camera Move out the neutral density filter and both lenses see Fig 3 and verify that the beam spot is roughly centred on the aperture of the streak camera If you plan to use the dove prism repeat this test with the dove prism in Adjust the X Y stage of the dove prism manually if necessary Put in the M 0 2 lens see Fig 3 With the dove prism out verify that the beam is centred on the vertical slit This is the case if roughly the same amount of light is reflected from the upper and the lower jaw If you plan to use the dove prism repeat this test with the dove prism in Put in the OD4 neutral density filter see Fig 3 before ope
16. of the Camera window for the CCD camera 2015 05 12 Optical Synchrotron Radiation Diagnostic Page 14 Beamline Manual 7 9 79 1 Rev 7 Select Options Capture and set the configuration shown in Fig 5 Capture Capture LK Method Continuous URNS iunii Cancel Interval i l Help Toolbar Camera 1 Video Gain Black Level Trigger ew EI Positive e aie EE Processing Frame Summing a Frame 4verage a Gain Correction Reference Subtract Convolution None Set Reference Source Current Frame Fig 5 Configuration of the Capture window for the CCD camera 2015 05 12 Optical Synchrotron Radiation Diagnostic Page 15 Beamline Manual 7 9 79 1 Rev 7 The CCD camera can be used to capture an image of the beam at its moment of death as the storage ring trips In this case the Capture window needs to be set up as shown in Fig 6 Capture Capture Method Continuous Interval Camera ka Video Gain Black Level Trigger Video Trigger Positive Trigger Dut while Running Interval 1 e Trigger Out Delay Video Trigger Level 64 Processing Frame Summing Frame Average Humber of Frames Gain Correction Reference Subtract Convolution Hone Set Reference Source Current Frame Fig 6 Configuration of the Capture window for capturing the beam at its moment of death
17. shown in Fig 14 Curser Orientation may be set as desired Beam Display 2D only TA Beam view 2D gt 3D Cancel Cursors Centroid hi l Crosshair Manual T Cursor Orientation Major Minor ii Grid Origin Location window UL Gn Help Beam Colors Color Continuous Z Asis Scale w e Cursor Profiles aD only Wins Priv e Cross Hatch Beam Display Current Alone Set Reference Source Current ae _ Contour Display Thresholds Lower 0 000e 00 a Tilt Upper 1 023e 03 Wire Density 51 2 400 Rotate Color Bar Fig 14 Configuration of the Beam Display window for the ICCD camera For a proper measurement of the beam size and position it is important to subtract the background light To start this background subtraction close the table photon shutter see Fig 3 and click Ultracal in the Spiricon window Open the table shutter again when the background measurement is finished after a few seconds Spiricon has 3 toolbars Cmo A HEO Bow a e EO ERRA k Centroid Color Continuous xl Current Alone E or AFA The top toolbar is for triggering and sampling It should be set as shown with 2 and u not pressed The numbers to the right of 2 and u are then meaningless The middle toolbar defines the crosshairs and should be set as shown The bottom toolbar describes the region of interest The region of interest can be defined by entering coo
18. the X direction from the beam stop and detects X ray luminescence from the beam stop A brass absorber wedge on a motorized stage in front of the APD is used to adjust the count rate of the APD 2 4 8 2 Readout The readout system consists of a constant fraction discriminator CFD and a time to digital converter TDC The constant fraction discriminator BL EE DIAG 0072780 0072781 is a custom designed NIM module with a fixed constant fraction delay matched to the rise time of the APD a fixed fraction of 0 25 and a fixed output pulse width of 5 ns The dead time of the CFD is just under 10 ns Therefore after an X ray is detected the system is blind to photons from the following 4 bunches but is able to detect an X ray from the fifth bunch The time to digital converter is a CAEN V1290N multi hit VME TDC with a resolution of 25 ps It measures the arrival time of an X ray relative to the orbit clock of the storage ring 2 5 RESOLUTION The resolution of the OSR line is determined by the following effects e Diffraction from the primary mirror 2 4 2 in Y and from the slits 2 4 5 in X e Depth of field e Dispersion of the electron beam e Curvature of the electron beam X only For the typical slit settings given in 2 4 5 the resolution in Y is 55 um which is mostly due to diffraction at the primary mirror 51 um In X the resolution is also 55 um with diffraction from the slits accounting for 48 um These are 1 o values which need t
19. 2 7 4 Intensified CCD ICCD ec eeccceccceceeeeceeeeeseeeeseeeesseeeeseeessaeeesens 6 2015 05 12 Optical Synchrotron Radiation Diagnostic Page i Beamline Manual 7 9 79 1 Rev 7 29 FUCA Camne deena aces pavessieatanens a panies a te sameasmanasheenooen 7 2 8 Local Monitors and Displays wiiseeviacenatiadetactactaadindevactareaadindeHactatetaatiadeteeeds 9 29 TeStEQUDMEN esie a a a thi cauue al fave aalghauueaenee 10 SO UTS OUE aE A 11 3 1 How to Set up the OSR Optical Chicane ccccccceececeeeeecseeteeeeeeeeenanees 11 3 2 How to Set up Spiricon for the CCD Camera cccccccceccceececseeeneeeeaneeeeees 14 3 3 Using the CCD Camera to Steer the BEam cccccceccceecceeeeteeeeneeeeeneeseees 19 3 4 Interpreting the CCD IMQQES ccccccecccceeeeceeeeceeeeeceeeesseeeeseeeesseeeeseeeeseaees 19 3 5 How to Set up Spiricon for the ICCD Camera ccccccceeccsececeeeeaeeeeaeeeneees 21 3 6 Controlling the ICCD Came ra cccccccccccceeccceeeeeseeeceeeesseeeeseeeesseeeesaeeesaaees 25 3 7 How to Run the ICCD Came ra ccccccccecccececeseeeeeeteeeceesaceteueeseeetaneesaees 26 3 7 1 Studies of the Stored BEAM ccccccccecccsscecseeeeeeeteeeeseeeeeeetsneeseees 26 3 7 2 Studies of the Injected BEaMM ccccccccsscecseecceeeceeeecseesceeesseeeneees 26 3 8 Interpreting the ICCD IMAGES cccceccccceeeeceeeeeseeeeceeeeseeeeeceeeessaeeeseeeeneaees 27 3 9 How to O
20. 9 79 1 Rev 7 The streak camera has an intrinsic trigger delay that depends on the horizontal sweep speed There is no adjustment for this delay However the delay of the trigger signal supplied to the streak camera can be adjusted in the timing system In the Timing Control Window click on the Booster tab and enter the delay in the Streak Camera field Fig 35 If the standard settings of the timing system are used the longest possible horizontal sweep time that will image the beam at injection is 200us In this case the Streak Camera delay in Fig 35 should be set to 0 If shorter sweep times are used the Streak Camera delay in Fig 35 needs to be increased Timing Control Window Linac LTB Booster SR1 Operations aiae Run LINAC Delay Pulse Width BTS Oscilloscope Streak Camera Inj Delay Inj Kicker Septum Delay Injection Septum Kicker Delay Booster Ramping Delay ooon Extraction Delay Booster Start On SR1 Injection OFF Fig 35 The Booster tab in the Timing Control Window lt no selection HOW TO SET UP THE FILL PATTERN MONITOR Click the FillPatternMonitor tab on the OSR control screen to select the control window for the fill pattern monitor Fig 36 Verify that Histogram to Integrate is set to SR1 Look at the Frequency Counter reading at the bottom of the screen The APD may be run at many MHz without the risk of immediate damage However a compromise needs to be made between running at
21. CAM Ok Resolution in Max O12 450 Frame Size Butter size Kb 13238 Frames ME Syne Source Genlock e 10 CAM Path Cancel Help Pixel Scale y 3 000e 01 4 save LAM H 3 000e 01 Advanced Pixel Units um Gamma 1 000e 00 Lens Fig 11 Configuration of the Camera window for the ICCD camera 2015 05 12 Optical Synchrotron Radiation Diagnostic Page 21 Beamline Manual 7 9 79 1 Rev 7 Select Options Capture and set the configuration shown in Fig 12 Capture Capture Method Interval Camera Camera 2 Video Gain Black Level Trigger Cw al Positive while Running 1 a 128 Processing Frame Summing a Frame Average a Gain Correction Reference Subtract Convolution None Set Reference Source Current Frame Fig 12 Configuration of the Capture window for the ICCD camera 2015 05 12 Optical Synchrotron Radiation Diagnostic Page 22 Beamline Manual 7 9 79 1 Rev 7 Select Options Computations and set the configuration shown in Fig 13 Computations 0 000e 00 Clie 2 Pliltioli ar Whole Beam FocalLenath a 1 000e 00 Aanes rleirl fel Es Fig 13 Configuration of the Computations window for the ICCD camera 2015 05 12 Optical Synchrotron Radiation Diagnostic Page 23 Beamline Manual 7 9 79 1 Rev 7 Select Options Beam Display and set the configuration
22. UN THE ICCD CAMERA To avoid drifts of the ICCD shutter time let the camera warm up for about 20 min before using it Turn off the lights above the optical table pull the curtain and dim the lights above the racks before removing the cap of the ICCD camera 3 7 1 Studies of the Stored Beam Connect the ICCD Trigger cable to Orbit on panel P1601 1 02 Select the M 4 lens see Fig 3 Set the exposure time to 570 ns Reduce the optical density of the neutral density filter see Fig 3 until an image of the beam appears To find the first filled bucket gradually reduce the exposure time to 1 ns while increasing the delay as required to keep the beam spot visible Reduce the optical density of the filter if necessary With the exposure time set to 1 ns change the delay setting in 1 ns steps and watch the beam spot appear and disappear as you move from bunch to gap to bunch If the beam spot does not disappear completely change the delay setting by 0 5 ns and then repeat the 1 ns increments Once a proper light dark sequence is established you can move from bunch to bunch by increasing decreasing the delay by 2 ns You can also change the number of bunches you are observing by increasing decreasing the exposure time in 2 ns steps 3 7 2 Studies of the Injected Beam 2015 05 12 Connect the ICCD Trigger cable to Injection on panel P1601 1 02 Select the M 1 lens see Fig 3 Inject beam with the storag
23. a turn are overlapping horizontally so that individual bunches are not resolved 2015 05 12 Optical Synchrotron Radiation Diagnostic Page 35 Beamline Manual 7 9 79 1 Rev 7 3 11 3 Using the M5677 Slow Speed Sweep Unit Make sure the M5677 Slow Speed Sweep Unit and the M5679 Dual Timebase Extender Unit are plugged into the camera In the Modify hardware profile window Fig 18 click on the Setup streak devices button and set the configuration shown in Fig 26 VO addr GPIB installed at 0 GPIB board type Keithley NI Connected ta Addr Streak camera elg Spectrograph None 13 Delay generator 10 Delay generator None 10 E Counter board WO addr installed at 0 Counter board type DT2819 Connected to F Streak camera status port 46538 shutter box Motorized slit External devices setup Use streak camera Device Pl ug in M5877 F Usespectrograph Device Chromex 2505 F Useas monochromator mounted turned by 90 F Use delay generator Device F Use delay generator Device Cancel Fig 26 The Device control setup window showing the correct settings for running the M5677 Slow Speed Sweep Unit Except for the Plugin field top right the default configuration should be correct Click Setup in the Device control setup window Fig 20 click OK in the Modify hardware profile window Fig 18 and then click OK in
24. alf of the light cone see 2 4 2 The X gap was determined empirically in order to optimize the resolution of the system considering the spot size vs diffraction from the slit 2 4 6 Lens The lens is an achromat with a diameter of 150 mm and a nominal focal length of 3 m It was found however that the true focal length is 2 965 m Therefore the lens is located 5 93 m from the source point 70 mm closer than the design position This results in a magnification of 1 with the primary focus at a distance of 11 86 m from the source point The lens is mounted on a 3 axis translation stage but the motion in X and Y is disabled The settings used in normal operation are 0 mm fixed 0 mm fixed 2015 05 12 Optical Synchrotron Radiation Diagnostic Page 3 Beamline Manual 7 9 79 1 Rev 7 2 4 7 Controls for the Optical Chicane Rack R2405 1 04 located on top of the storage ring contains the control hardware for the optical chicane A K type thermocouple TM1402 B10 06 is mounted inside the optical chicane This thermocouple is used to monitor and log the temperature inside the chicane 2 4 8 Fill Pattern Monitor 2 4 8 1 Detector The detector is a Hamamatsu C5658 module consisting of an avalanche photodiode APD a bias supply and an amplifier The detector has a bandwidth of 1 GHz and an active area 0 5 mm in diameter The spectral response range is 400 1000 nm but the module works well as a single photon X ray detector The APD is located in
25. alysis of the beam It is a 4 Picos camera running in interlaced mode and it includes a software package to control it This software runs on a computer in the OSR hutch but remote control from the control room is available via a KVM extender The camera is connected to a frame grabber and the Spiricon software see 2 7 1 is used to analyze the images The camera is normally triggered by the storage ring synchronous trigger but the storage ring injection trigger is available for injection studies and a dump trigger is available for 2015 05 12 Optical Synchrotron Radiation Diagnostic Page 6 Beamline Manual 2 7 5 2 7 9 1 7 9 79 1 Rev 7 studies of the beam decay after an RF trip The trigger is selected by moving the ICCD trigger cable to the appropriate spigot on P1602 1 02 see O2B1 2 EE WIR 0090780 The trigger circuit of the camera ignores trigger signals that are sent while the camera Is not ready to accept them However experience shows that the camera should not be triggered at a rate gt 200 Hz in order to avoid temperature drifts in the trigger circuit A pre scaler BL EE DIAG 0106150 is used to divide down the trigger rate when running with the storage ring synchronous trigger The range of exposure times is 200 ps to 80 s although in this application it is usually not practical to exceed exposure times of 100 us because the light intensity would be too high Nevertheless it is possible to acquire images of a single bun
26. ce point is at an angle of 5 into dipole 02B1 2 3 PHOTON SHUTTER The shutter is protected by stopping the electron beam in the storage ring if the cooling water flow is less than 35 FLT1402 B10 01 Motion control of the shutter in and out of the beam is provided by a pneumatic cylinder a pneumatic control valve and two position sensing switches The shutter can only be opened when the vacuum valve is open 2 4 OPTICAL CHICANE 2 4 1 Photon Absorber A photon absorber is located 1 957 m from the source point Its aperture is 12 mm in X and 16 mm in Y This corresponds to an angular acceptance of 0 6 13 mrad and 0 8 18 mrad The transmitted beam power integrated vertically is approximately 70 W mrad horizontally at 500 mA Therefore the total power passing through the photon absorber is about 430 W at 500 mA 2 4 2 Primary Mirror The primary mirror is located 5 m from the source point It only intercepts the visible light in the upper half of the synchrotron light cone The mirror consists of aluminum coated glidcop with a 200 nm SiO coating The SiO coating is specified to withstand 10 R without noticeable darkening The mirror is water cooled with a liquid gallium layer as thermal coupling The size of the mirror is 50 mm 50 mm The mirror can be moved in and out of the beam at a fixed angle of 45 A thermal probe with two K type thermocouples is attached to the lower edge of the primary mirror The mirror is pr
27. ch or at the other extreme average over hundreds of turns The camera has a built in delay of 0 s to 80 s in steps of 100 ps Again only the bottom end of the range is practical in this application The delay can be used to select a single bunch or the start of a sequence of bunches or to select a turn during injection studies Note A delay of approximately 163 us needs to be set to select the first turn after injection For injection studies the storage ring RF needs to be turned off since the ICCD would otherwise be blinded by the stored beam Streak Camera The purpose of the streak camera is to monitor the state of individual bunches e Measure the bunch length e Observe the bunch from the top or the side e Monitor the bunch for unstable motion The streak camera is a Hamamatsu C5680 31 camera with a cathode height of 500 um and with A1976 01 broadband input optics It has an RS170 video output connected to a frame grabber and is controlled by the vendor provided HPD TA9 software package through a GPIB interface The wiring diagram for the streak camera is shown in 02B2 02 EE MON WIR 0108280 The camera has the following plug ins M5675 Synchroscan Sweep Unit The Synchroscan Sweep Unit has a vertical sweep frequency of 166 7 MHz 1 3 far It is synchronized with the storage ring RF frequency frre and therefore paints every third bunch in the storage ring see Fig 1 while the other bunches arrive when the vertical swee
28. d Sweep Unit Also the time delay between a trigger and the start of the vertical sweep depends on the sweep speed A combination of a fibre delay and a NIM delay module is used to adjust the timing of the trigger signal in order to position the image on the screen 2 7 5 3 M5679 Dual Timebase Extender Unit The Dual Timebase Extender Unit has a horizontal sweep frequency of 10 Hz or less depending on the sweep speed Trigger signals that arrive during the deadtime should be ignored However it was found that the behaviour of the trigger circuit is unpredictable when triggered during the deadtime Furthermore a synchronization problem was noticed between the camera and the frame grabber when the horizontal sweep and the frame grabber were triggered simultaneously as recommended by Hamamatsu Both problems were addressed by building a Streak Camera Synchronizer module BL EE DIAG 0106190 It monitors the video signal of the streak camera and recognizes odd and even fields It then divides the 30 Hz odd even field frequency by a selectable number to obtain a horizontal trigger frequency lt 10 Hz The timing of the horizontal trigger signal is then determined by the first pre scaled storage ring synchronous trigger see 2 7 4 2 to follow the pre scaled odd even field signal This setup satisfies all of the following conditions e No horizontal trigger signal arrives at the camera during its deadtime e The frame grabber is synchronized to the
29. e ring RF turned off Stored beam would blind the camera Set the exposure time to 5 7 us and the delay to 163 us In Spiricon set the trigger type to Video Trigger Reduce the optical density of the neutral density filter see Fig 3 until an image of the beam appears Gradually reduce the exposure time to 570 ns Adjust the delay if necessary Also reduce the optical density of the filter if necessary With the exposure time set to 570 ns change the delay setting in 570 ns steps and watch the beam spot jump as you move from turn to turn If two locations are visible simultaneously instead of the beam spot jumping from one location to another two turns are observed in part Adjust the delay Reduce the delay in 570 ns steps until the beam spot disappears Then increase the delay by 570 ns This is turn 1 Optical Synchrotron Radiation Diagnostic Page 26 Beamline Manual 7 9 79 1 Rev 7 e You can now move from turn to turn by increasing decreasing the delay by 570 ns You can also change the number of turns you are observing by increasing decreasing the exposure time in 570 ns steps 3 8 INTERPRETING THE ICCD IMAGES Fig 16 shows how the beam at the source point is projected onto the Spiricon screen Usually the Lens flag in the Camera window is not checked The Spiricon coordinates are indicated for the purpose of interpreting the beam position numbers read from Spiricon See section 1 3 for the definition of
30. ee sms Pe C aese o o o l o 2015 05 12 Optical Synchrotron Radiation Diagnostic Page 37 Beamline Manual 7 9 79 1 Rev 7 The number of frames in the table is the minimum that must be selected in order for the image to cover the entire screen Greater numbers may be selected as shown in some of the entries but the maximum allowable frame rate will be affected To change the number of frames click the Live tab in the Analog camera acquisition control window Fig 22 click Freeze if the acquisition is running and select the number of frames in the Integrate after trig field Note If the frame rate divider is set too low the internal pre scaling of the camera trigger is automatically activated The camera may work for most of the time since failures tend to be sporadic However the image may flicker or may suddenly disappear for no obvious reason 3 11 5 Vertical Sweep when Using the M5677 Slow Speed Sweep Unit The maximum vertical trigger rate that the camera can accept depends on the vertical sweep speed If the vertical trigger rate exceeds this maximum the camera automatically pre scales the trigger input In this case however synchronization between the vertical and the horizontal trigger is lost causing the image to walk or jump horizontally To avoid this problem an external pre scaler is used to divide the storage ring synchronous trigger 1 754 MHz down to an acceptable rate The minimum set
31. el on the table shutter which indicates the nominal beam spot position The actual spot should be visible somewhere on the table shutter Note If the light above the optical table is dimmed the spot is clearly visible at a beam current of a few mA Steer the beam towards the nominal position using the XY using rotation arrows in the optical chicane control window Fig 2 This moves the secondary mirror The direction of motion iS 2015 05 12 Optical Synchrotron Radiation Diagnostic Page 12 Beamline Manual 2015 05 12 Rotation Shutter Coordinates Optical Synchrotron Radiation Diagnostic Beamline Manual 7 9 79 1 Rev 7 Page 13 7 9 79 1 Rev 7 3 2 HOWTO SET UP SPIRICON FOR THE CCD CAMERA To start up Spiricon click on the icon Spiricon has a large number of features and options Some have not been explored yet and some are not applicable to the CCD camera The following configuration is suggested as a Starting point A detailed description of the Spiricon software can be found in Ref 2 Select Options Camera and set the configuration shown in Fig 4 Frames may be set as desired Camera Camera COHU_B6124NALOG CAM at Resolution a Max 512 480 Frame Size ae Buffer Size Kb 1928 Frames 4H Syne Source Genlock 10 Help CAM Path Pixel Scale Yi 9 900e 00 save CAM 9 900e 00 Fisel Units um Gamma 1 000e 00 Lens Fig 4 Configuration
32. ertical sweep are consecutive turns in the storage ring File Tools Acquisition Corrections Analysis Display Processing Window Info cH eGeoshO ko iQ o we 7 C5680 M5677 control amp Parameter name Parameter value 50 ns v Operate 4 Gate Mode 4 kA A v Shutter z ke A v v Gate Time 4 lt 4 gt 4 t 4 lt gt 4 4 gt 4 Fig 29 The streak camera running in slow sweep mode Individual bunches are resolved 2015 05 12 Optical Synchrotron Radiation Diagnostic Page 39 Beamline Manual 7 9 79 1 Rev 7 3 11 6 Analog Integration To initialize analog integration select Analog Integration in the Analog camera acquisition control window If the window shows fewer features than Fig 30 click on the button on the right Set the configuration shown in Fig 30 Adjust the of exposures field as required for the given amount of light and click Integrate to start Analog camera acquisition control Analog Integration Photon counting Action Integrate Frame grabber trigger Active Integrate after trig Integration ofexposures 20 Clear on start Fig 30 The Analog Integration settings in the Analog camera acquisition control window 3 11 7 Profiles To define a region of interest click the button horizontal profile or the button vertical profile and select a region Then
33. gion of interest by selecting the region with the mouse 2015 05 12 Optical Synchrotron Radiation Diagnostic Beamline Manual Page 45 7 9 79 1 Rev 7 The Duty Factor is a measure of the evenness of the fill pattern If all buckets contain the same amount of charge the duty factor is 1 The duty factor is calculated as _ Zi ni h Yin ni where d is the duty factor h is the harmonic number of the storage ring 285 and n is the number of counts in bunch i d The fill pattern can be saved by clicking Save Fill and is stored in the user home directory The fill pattern and the duty factor are available as EPICS process variables Fill pattern TDC1602 101 m13 Bucketlntegrals Duty factor TDC1602 101 m13 DutyFactor Some beamlines monitor these process variables For consistency the fill pattern monitor should therefore be configured as show in Fig 36 during normal machine operation 4 0 REFERENCES 1 Facility Diagnostic Beamline Preliminary Design Report CLS document 6 2 79 1 2 SPIRICON Laser Beam Diagnostics Operator s Manual Spiricon Inc Logan Utah USA 2002 3 Operating Manual for the intensified CCD video camera systems Stanford Computer Optics Inc 2002 4 High Performance Digital Temporal Analyzer Version 6 4 HPD TA User Manual Hamamatsu Photonics Deutschland GmbH 2002 2015 05 12 Optical Synchrotron Radiation Diagnostic Page 46 Beamline Manual Revision 2A 3A 4A 5A
34. is visible Fig 25 shows the beam in the storage ring on a turn by turn basis Bunches within one turn are overlapping so that individual bunches are not resolved 2015 05 12 Optical Synchrotron Radiation Diagnostic Page 34 Beamline Manual 7 9 79 1 Rev 7 File Tools Acquisition Corrections Analysis Display Processing Window Info A E EEE EN N AE Q o mae Analog camera acquisition control A Live 0 Zoom x1 Live Acquire Analog Integration Photon counting Frame grabber trigger V Active Integrate after trig 7 C5680 M5675 control sz Parametername Parameter value 414 4 ER iid Sire lt gt 4 gt 4 43 4 4 m p Fig 24 The streak camera running in synchroscan mode Each vertical line is one bunch in the storage ring but only every third bunch is shown File Tools Acquisition Corrections Analysis Display Processing Window Info co E EE ENa Ar NORNER mR e Analog camera acquisition control mez Live 0 Zoom x1 Acquire Analog Integration Photon counting Single Exp Frame grabber trigger 7 Active Integrate after trig 7 C5680 M5675 control Eg Parameter name Parameter value Gate Time 44 lt gt 4 4 gt iii Ah i gt 4 w j Fig 25 The streak camera running in synchroscan mode Each of the 3 large spots corresponds to 1 turn in the storage ring Bunches within
35. n when the background measurement is finished after a few seconds Spiricon has 3 toolbars m I file fs 8 J kl Centroid Color Continuous x1 Current Alone a Manual ZB The top toolbar is for triggering and sampling It should be set as shown with 2 and u not pressed The numbers to the right of 2 and u are then meaningless The middle toolbar defines the crosshairs and should be set as shown The bottom toolbar describes the region of interest The region of interest can be defined by entering coordinates or by dragging and resizing The button needs to be pressed to read meaningful values for the beam position or the beam size 2015 05 12 Optical Synchrotron Radiation Diagnostic Page 18 Beamline Manual 7 9 79 1 Rev 7 3 3 USING THE CCD CAMERA TO STEER THE BEAM The following table lists the directions in which the beam is steered when the XY Using Rotation arrows are used Normally the Lens option in the Spiricon Camera window would not be checked The beam direction at the table shutter is given as seen on the upstream side of the shutter when the shutter is closed XY Using TV Monitor Spiricon Spiricon Rotation Lens Option E u T aa e a Using Spiricon set the centroid of the beam to X 2500 um and Y 2500 um This is the reference beam position for all other devices on the Optical Table 3 4 INTERPRETING THE CCD IMAGES Fig 9 shows how the beam at the source p
36. ncy Duty Facto ed Time Save Fill FQCc1602 102 To Integrate ae Saad Elaps TE Saves FillPattemABCD to your home directory 44 716 kHz 0 9729 O 10 20 30 40 50 60 70 80 90 100 E inteoral Confio Fig 38 The Integral Config screen of the fill pattern monitor software Width is always 81 92 The combination of Centre Position and Bucket Number does not change unless machine parameters such as the RF phase are changed HOW TO RUN THE FILL PATTERN MONITOR The fill pattern in Fig 35 shows the integrals over the peaks in Fig 38 adjusted so that the spectrum starts at bucket 1 according to the selection of Centre Position and Bucket Number The integral of each bucket is proportional to the charge in this bucket 3 13 Click on your choice of Log or Linear display The example shown in Fig 36 uses the Linear display but the operation is the same if Log is chosen If the Integration Mode is set to Start Stop the data acquisition is operated manually If the Integration Mode is set to Automatic the fill pattern will accumulate until a preset count Integration Maximum is reached in the highest bucket or it will accumulate for a preset amount of time Integration Time depending on the Automatic Mode chosen If Acquisition Repeat is enabled the fill pattern will be zeroed after a preset amount of time Delay between scans and the acquisition will repeat indefinitely It is possible to zoom in on a specific re
37. nearly but it can be switched to a log scale home control opi DiagnosticBeamlines OSR_Beamline Main edl SR1 Fill Pattern Monitor Absorber Motor SMTR1402 B10 12 Fill pattern monitor _SMIRi402 B10 12 Setpoint feedback 20 090 mm moving Frequency Counter FQC1602 102 45 686 kHz Fig 37 The SR1 Fill Pattern Monitor Absorber Motor screen showing a typical absorber setpoint 2015 05 12 Optical Synchrotron Radiation Diagnostic Page 44 Beamline Manual 7 9 79 1 Rev 7 Click Integral Config to look at the raw TDC spectrum and turn on Show Integral Boundaries see Fig 38 Zoom in as needed and enter the Centre Position and the Bucket Number for one of the buckets in the SR1 Detector row The purpose of this is twofold e To locate the integration boundaries around the peaks e To define the bucket numbers the same way the timing system does The Width is 81 92 and must not be changed home control opi DiagnosticBeamlines OSR_ Beamline Main edl epi Tae soon a en ss eA Automatic Integration Integration Controls Mode Time Integration Mode Histogram Display Options Show Integral Boundries Integral Configuration Parameters Width 81 92 XSR Detector 6352 Bucket Number 35 SR1 Detector 81 92 4029 35 Done Counter Histogram complete tog Freque
38. ning the shutter Turn off the lights above the optical table pull the curtain and dim the lights above the racks before opening the shutter of the streak camera When the shutter is open change to a lower optical density see Fig 3 as required to make an image appear Optical Synchrotron Radiation Diagnostic Page 28 Beamline Manual 7 9 79 1 Rev 7 3 11 HOW TO RUN THE STREAK CAMERA To open the streak camera program click on the icon The window shown in Fig 17 will open Hardware profile C HPDTA CLS hwp Camera type Analog camera PC2 Vision Streak devices Device Address Cancel T Start without hardware Fig 17 Welcome window of the streak camera software Click on Modify to open the Modify hardware profile window and click on Modify current HW Profile Fig 18 2015 05 12 Optical Synchrotron Radiation Diagnostic Page 29 Beamline Manual 7 9 79 1 Rev 7 Hardware profile stored in file Hardware profile stored in file C Program Data Hamamatsu HPDTA CLS hwp C Program Data Hamamatsu HPDTA CLS hwp Load hardware profile Create new hardware profile Modify current HW Profile Load hardware profile Create new hardware profile Setup CCD camera Modify hardware Setup streak devices profile Setup time scaling Fig 18 The Modify hardware profile window as it opens left Click on Modify current HW Profile to make all buttons vi
39. o be subtracted in quadrature from the measured beam spot size in order to obtain the true beam spot size Note The beam spot size typically 400 um in Y and 700 um in X is given as 4 o values and needs to be divided by 4 before the resolution is subtracted in quadrature 2015 05 12 Optical Synchrotron Radiation Diagnostic Page 4 Beamline Manual 7 9 79 1 Rev 7 2 6 OPTICAL ELEMENTS ON THE OPTICAL TABLE The layout of the optical table is captured in drawing 02B1 2 ME OPT 009400 2 6 1 Shutter In order to protect the cameras the optical table is equipped with a shutter that closes automatically when any of the filter wheels are moved 2 6 2 Beam Splitters There are three beam splitters on the optical table The first one has 50 transmission toward the ICCD camera and the CCD camera and 50 reflection toward the fast steering mirror or the streak camera The second beam splitter is located in the ICCD CCD line right behind the first splitter It has 90 transmission toward the ICCD camera and 10 reflection toward the CCD camera The third splitter is located in the FSM line and has 90 transmission toward the PSD and 10 reflection toward the CCD camera 2 6 3 Fixed Mirror There is one fixed mirror in the streak camera line It is a Newport 20D20BD 1 2 6 4 Neutral Density Filters There are four neutral density filter wheels one each for the CCD camera the CCD camera in the FSM line the ICCD camera and the streak camera The filters
40. oint is projected onto the TV monitor See section 1 3 for the definition of the beam coordinates A Y X a Beam at the source point Fig 9 The beam coordinates as they appear on the TV monitor for the CCD camera 2015 05 12 Optical Synchrotron Radiation Diagnostic Page 19 Beamline Manual 2015 05 12 7 9 79 1 Rev 7 Fig 10 shows how the beam at the source point is projected onto the Spiricon screen Usually the Lens flag in the Camera window is not checked The Spiricon coordinates are indicated for the purpose of interpreting the beam position numbers read from Spiricon Spiricon coordinates gt X Y t Y X X lt _ lt vY Beam at the source Beam at the source point Lens flag not point Lens flag set set default Fig 10 The beam coordinates as they appear in the Spiricon window for the CCD camera Optical Synchrotron Radiation Diagnostic Page 20 Beamline Manual 7 9 79 1 Rev 7 3 5 HOW TO SET UP SPIRICON FOR THE ICCD CAMERA To start up Spiricon click on the icon Spiricon has a large number of features and options Some have not been explored yet and some are not applicable to the ICCD camera The following configuration is suggested as a Starting point A detailed description of the Spiricon software can be found in Ref 2 Select Options Camera and set the configuration shown in Fig 11 Frames may be set as desired Camera Camera SPIRICON_TC 1122
41. or F Use delay2 generator F Streak camera status port TA aag C A6538 shutter box Port ID 1 Fig 20 The Device control setup window showing the correct settings for running the M5675 Synchroscan Sweep Unit Except for the Plugin field top right the default configuration should be correct Motorized slit Click Setup in the Device control setup window Fig 20 click OK in the Modify hardware profile window Fig 18 and then click OK in the HPD TA 9 window Fig 17 The 3 windows that are shown in Fig 21 will open up 2015 05 12 Optical Synchrotron Radiation Diagnostic Page 31 Beamline Manual 7 9 79 1 Rev 7 File Tools Acquisition Corrections Analysis Display Processing Info cH moms O kilo 2 8Q o we amp LUT Control Parameter name Parameter value 0 E o Shutter Gate Time 0 E B i jl Je ET an ke ea C5680 M5675 1 Focus 0 Normal Closed DEV CAM IMG PRF SEQ LUT Image size 640x480 Fig 21 After completing the device control setup a new HPD TA 9 window opens up which contains the LUT Control window and the C5680 M5675 control window In the new HPD TA 9 window select Acquisition Live to open the Analog camera acquisition control window and set the configuration shown in Fig 21 If the window shows fewer features than Fig 22 click on the button on the right Frame grabber trigger
42. otected by closing the front end photon shutter e If the cooling water flow is less than 30 FLT1402 B10 02 e lf either or both of the thermal probe temperatures exceed 50 C TM1402 B10 04 TM1402 B10 05 2015 05 12 Optical Synchrotron Radiation Diagnostic Page 2 Beamline Manual 7 9 79 1 Rev 7 2 4 3 Beam Stop The beam stop is protected by closing the front end photon shutter e If the cooling water flow is less than 30 FLT1402 B10 03 e lf the return water temperature exceeds 28 C TM1402 B10 03 2 4 4 Secondary Mirror The secondary mirror is located 5 5 m from the source point It is identical to the primary mirror except for the water cooling and the temperature monitoring It can be moved in the following manner e Vertical translation e Rotation about the horizontal axis e Rotation about the vertical axis In normal operation the secondary mirror is tilted 45 about its horizontal axis However it can be turned perpendicular to the optic centre line so that light from the optical table is reflected back to the table 2 4 5 Slit Assembly The slit assembly is located 5 615 m from the source point It has 4 independent blades but control of the blades is combined into gap and centre in both X and Y The following settings are used in normal operation _ Gap The Y gap allows all visible light to pass through the slits The Y centre has an offset because the primary mirror only intercepts the upper h
43. p is above or below the screen Since the harmonic number of the storage ring 285 is divisible by 3 the Synchroscan Unit paints the same subset of 95 bunches in every turn i e either bunches 1 4 7 283 Fig 1 a or 2 5 8 284 Fig 1 b or 3 6 9 285 Fig 1 c The 166 7 MHz signal to the Synchroscan Unit is delayed in a Hamamatsu C1097 04 Delay Unit The beam bunches can be positioned on the screen by making small adjustments to the delay setting The desired subset of bunches can then be chosen by increasing or reducing the delay setting in steps of 2 ns Fig 1 a 1 b 1 c Increasing or reducing the delay setting by 3 ns switches between painting the same subset of beam bunches on the up stroke Fig 1 a or on the down stroke Fig 1 d The 166 7 MHz signal is generated from the 500 MHz master oscillator signal in a divide by 3 module CDAC EE TMNG 0090870 The 500 MHz sine wave is converted into a digital signal and divided by 3 in such a way that a square wave with a 50 duty cycle results A low pass filter is then used to reject the higher harmonics resulting in a 166 7 MHz sine wave It now appears that the higher harmonics would be rejected by the input of the streak camera anyway but at the time the circuit was designed before delivery of the camera this information was not available 2015 05 12 Optical Synchrotron Radiation Diagnostic Page 7 Beamline Manual 7 9 79 1 Rev 7 a 0 0 f 9 0 0 Screen
44. perate the Fast Steering Mirror ccccccccsseeceeeeeceseeteeeeneeeensness 27 3 10 How to Set up the Streak Camera sorcerer E 28 3 11 How to Run the Streak Camera cccccccccccsecccsececeeeteneeceeeeeeeteueeseeetaneeseees 29 3 11 1 Using the M5675 Synchroscan Sweep Uniit ccccceseeeeseeeeseeeneees 31 3 11 2 Horizontal Sweep when Using the M5675 Synchroscan Sweep Unit 34 3 11 3 Using the M5677 Slow Speed Sweep Unit ccccccceeeeseeeeeeeeeeees 36 3 11 4 Horizontal Sweep when Using the M5677 Slow Speed Sweep Unit 37 3 11 5 Vertical Sweep when Using the M5677 Slow Speed Sweep Unit 38 3 1 150 Analog MEGA Minsi a 40 HP P OUES e a i teehee ct acetate 40 3 118 Display OPUON S orinni aa i aia 42 3 11 9 Injection Studies with the Streak Camera in Synchroscan Mode 42 3 12 How to Set up the Fill Pattern MOnitor ccccccccceceeeeeeeeeeseeeeteeeeeseeeesaaees 43 3 13 How to Run the Fill Pattern Monitor cccccccsecceccseeceeeeeeceeeceeseeeeeseeeaees 45 AO TRCTCVONCCS cassar aa mest a A a a E N 46 PRC VISION FISTO Y zanne NER E A E R EEE N 47 2015 05 12 Optical Synchrotron Radiation Diagnostic Page ii Beamline Manual 7 9 79 1 Rev 7 1 0 INTRODUCTION 1 1 PURPOSE AND SCOPE This manual describes the design and operation of the Canadian Light Source Optical synchrotron Radiation Diagnostic Beamline OSR It describes the procedure for setting up the optical chicane and it
45. rdinates or by dragging and resizing The button needs to be pressed to read meaningful values for the beam position or the beam size 2015 05 12 Optical Synchrotron Radiation Diagnostic Page 24 Beamline Manual 7 9 79 1 Rev 7 3 6 CONTROLLING THE ICCD CAMERA This section describes how to initialize the ICCD camera for its most common mode of operation in the OSR beamline For a detailed description of all the features of the camera refer to the Operating Manual 3 To open the camera control window click on the icon zamera ontrol b 19 Click Initialize Connect then set the configuration shown in Fig 15 and Send it Set Delay and Time according to the specific measurement you want to make 4 Picos Rey 3 247x Single Mode 4 Picos Rey 3 24 45 Oe Shutdown Set Mode Dey fo firs Eel e Auto Multiple Time 0 006 fug Ell cr Automatic eeN MCP Gain Voltage F60 Scan Mode Video Acq Frame Grabber Frame f Standard e None serait C Field C CED Int C On Board Sync Output Trig Source Trigger Mode Gate Ctrl f Vertical C Fsyne f Direct Trigger f IntGt Initialize C Odd Trig C Snal T C ExtGt Port COM1 amma Video Gain Start Option co 045 C Auto f Cold e e Fixed 18 dE o Wan Auto E wit Fig 15 Control window for the ICCD camera 2015 05 12 Optical Synchrotron Radiation Diagnostic Page 25 Beamline Manual 7 9 79 1 Rev 7 3 HOW TO R
46. sed from the control room Access to the beamline hutch is required to configure and start up the streak camera and the fast steering mirror Users will have access to the image off the CCD camera 1 3 DEFINITIONS AND ABBREVIATIONS APD Avalanche Photodiode BPM Beam Position Monitor CCD Charge coupled Device CFD Constant Fraction Discriminator FSM Fast Steering Mirror KVM Keyboard Video Mouse OSR Optical Synchrotron Radiation PSD Position Sensitive Detector TDC Time to Digital Converter XSR X ray Synchrotron Radiation X Y Z A right handed system of coordinates defined such that Y is up and the beam travels in the Z direction Therefore X is left when looking downstream i e in the OSR hutch the storage ring is in the X direction and the Far IR hutch is in the X direction 2015 05 12 Optical Synchrotron Radiation Diagnostic Page 1 Beamline Manual 7 9 79 1 Rev 7 2 0 DESCRIPTION 2 1 VACUUM MACHINE PROTECTION Vacuum control is identified on the P amp ID Vacuum machine protection includes e Interlocking of cold cathode gauges thermocouple gauges residual gas analyzers and pumps to valve operation in the event of a vacuum loss Because of the lack of an actual front end on this beamline the machine protection function is implemented with the storage ring machine protection system e Allowing a valve to be opened only if the differential pressure across the valve is below a specified threshold 2 2 SOURCE POINT The sour
47. sible right Clicking on Setup CCD camera opens the window shown in Fig 19 All settings should be correct by default Select new camera CCD camera access Internal drivers 0 DCam API modules Internal Drivers Frame Grabber pe 3 vision Serial com Configuration file C ProgramData Hamamatsu HPDTA P2V_ElA ccf Board No p Fig 19 The Camera and frame grabber setup window with the correct settings Do not close the Modify hardware profile window More settings need to be selected depending on the mode of operation of the streak camera as described in the following sections 2015 05 12 Optical Synchrotron Radiation Diagnostic Page 30 Beamline Manual 7 9 79 1 Rev 7 3 11 1 Using the M5675 Synchroscan Sweep Unit Make sure the M5675 Synchroscan Sweep Unit and the M5679 Dual Timebase Extender Unit are plugged into the camera In the Modify hardware profile window Fig 18 click on the Setup streak devices button and set the configuration shown in Fig 20 External devices setup WO addr J Use streak c gt GPIB installed at 0 SE STEAK camera Devi a GPIB board type T O Keithley NI Connected to Addr Streak camera 2 ii F Use spectrograph Delay generator 10 Device F Useas monochromator mounted turned by 90 Delay generator 10 A Counter board WO addr installed at 0 Device DG535 Counter board type Connected to F Use delay generat
48. streak camera CCD and to the horizontal sweep e The vertical trigger rate is an integer multiple of the horizontal trigger rate see 2 7 4 2 2 8 LOCAL MONITORS AND DISPLAYS The following monitors and displays are permanently installed in the OSR hutch e Arack mounted video monitor connected to the CCD camera e Arack mounted video monitor connected to the CCD camera in XSR e A rack mounted computer monitor and keyboard tray switched between the CCD ICCD and streak camera data acquisition computers e Arack mounted control computer for beamline control and other diagnostics e 2 Keithley 6485 Picoammeters which are connected to the XSR X ray BPM 2015 05 12 Optical Synchrotron Radiation Diagnostic Page 9 Beamline Manual 7 9 79 1 Rev 7 2 9 TEST EQUIPMENT The following test equipment is dedicated to the OSR hutch e A0O 5 mW laser made by Research Electro Optics Inc model 31008 e A Hamamatsu C8898 Picosecond Light Pulser with a peak power of 66 mW anda pulse duration of 70 ps e The Canadian Light Source a battery powered white LED mounted in a box with an ST connector e A Tektronix TDS3052B oscilloscope e 2 BK Precision 1856D 3 5 GHz frequency counters e A Fluke 87 handheld multimeter e A Tektronix AFG3101 Arbitrary Function Generator e A Sony MHC GX250 stereo system which is used for acoustic vibration studies 2015 05 12 Optical Synchrotron Radiation Diagnostic Page 10 Beamline Manual
49. summarizes the parameters for setting up the instruments on the optical table for the various measurements that can be made on the beamline These parameters are intended to provide a reasonable starting point for any of the measurements not a complete list of all possible settings Also the interpretation of the data is beyond the scope of this manual It is assumed that the operator of the beamline is familiar with the layout of the facility and the beamline see Ref 1 and knows how to use an oscilloscope and a multimeter Familiarity with the CLS control system and with Microsoft Windows is also required The CCD camera the fast steering mirror and the fill pattern monitor are simple devices which can be operated with the information given in this document The ICCD camera can be operated with the information given in this document and in the ICCD operating manual 3 The streak camera is a complex and expensive device This document gives some instructions on setting up the streak camera but these are meant as a reminder for the experienced operator In depth hands on training is required to operate the streak camera as well as a good theoretical understanding of its principle of operation see Ref 4 1 2 BACKGROUND The Optical Synchrotron Radiation OSR beamline is located on port 02B1 2 see Ref 1 This beamline is used to monitor storage ring characteristics using visible light In normal operation the instrumentation is acces
50. the HPD TA 9 window Fig 17 Follow the instructions in 3 11 1 on starting the acquisition 2015 05 12 Optical Synchrotron Radiation Diagnostic Beamline Manual Page 36 7 9 79 1 Rev 7 The setting in Fig 27 is a good start for displaying bunch trains Pe C5680 M5677 control Ez Parameter name Farameter value EE 2 O orcrae GateMode Ea 5 m z J SEE Opes ee 100 us x Gate Time 0 ENE con a p r SEG fren a a p z a z Fig 27 Acamera setting commonly used to display bunch trains in the storage ring 3 11 4 Horizontal Sweep when Using the M5677 Slow Speed Sweep Unit The Streak Camera Synchronizer module synchronizes the horizontal trigger and the frame grabber trigger with the CCD frames of the streak camera This scheme only works as long as the internal pre scaling of the trigger input of the M5679 Dual Timebase Extender Unit is not activated The Streak Camera Synchronizer module has a built in pre scaler the ratio of which is selected by the Frame Rate Divider knob If the Knob is set to 9 the camera will work at all horizontal sweep speeds However for most of the sweep speed settings the frame capture rate will be slower than necessary The following table shows the minimum frame rate divider settings for the various horizontal sweep speeds when using the M5677 Slow Speed Sweep Unit C oms oo e o e l e T Pe T Pane C oms Pde C oms Pee sms P
51. the beam coordinates Spiricon coordinates gt X eT X X lt gt A Beam at the source vY point Lens flag not set default Beam at the source point Lens flag set Fig 16 The beam coordinates as they appear in the Spiricon window for the ICCD camera 3 9 HOW TO OPERATE THE FAST STEERING MIRROR Slide the fast steering mirror into the beam Set the switches of the FSM breakout box to PSD FEEDBACK X CLOSED LOOP Y CLOSED LOOP Power up the FSM breakout box and set the switches to INTERNAL FEEDBACK X CLOSED LOOP Y CLOSED LOOP Turn off the light above the optical table and on the SR side of the hutch The light on the IR side of the hutch may be left on if dimmed Power up the FSM breakout box and the fast steering mirror controller FSM CD 300B It does not matter which one is powered up first Power up the CCD camera of the FSM line and move the video cable from the other CCD camera Power down the other CCD camera to avoid noise pickup that appears in the image The CCD camera of the FSM line can now be used as described in 3 2 Note If the FSM breakout box is switched off or if the light to the PSD is below a certain threshold the FSM mirror will run in internal feedback mode If the light exceeds the 2015 05 12 Optical Synchrotron Radiation Diagnostic Page 27 Beamline Manual 7 9 79 1 Rev 7 threshold the mirror will be switched to external feedback
52. tings of this pre scaler are shown for the various vertical sweep speeds However these settings are somewhat temperature dependent and may therefore be marginal The pre scaler may be set to a higher number than the recommended setting However the higher the setting the fewer vertical sweeps and possibly none are drawn in the image Setting Sweep Frequency szoons tt tt 48 8596 5 He soons tt ttt 249298 2 He Fig 28 shows a number of bunch trains in the storage ring Individual bunches are not resolved The three bunch trains that are drawn by every vertical sweep are consecutive turns in the machine The time between vertical sweeps depends on the setting of the pre scaler In Fig 29 the individual bunches are visible 2015 05 12 Optical Synchrotron Radiation Diagnostic Page 38 Beamline Manual 7 9 79 1 Rev 7 7 HPD TA 9 Hig Performance Digital Temporal Analyzer 64 bit CLS hw ono File Tools Acquisition Corrections Analysis Display Processing Window Info ei weon aug RQ o Fg LUT Control Live 0 Zoom x1 Parameter name Parameter value 2us Operate f GateMode nd A v Shutter z Blanking Amp Gate Time 4 4 gt 4 Cont Ready 1 4 4 gt 4 Rising Ready 4 Cont 1 Rising lt gt 4 4 4 c Fig 28 The streak camera running in slow sweep mode Individual bunches are not resolved The bunch trains in every v
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