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Experts: click to hide code blocks ->
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Initial Spatial overlap between LPL, VISAR and X-rays
- This procedure assumes that
- the beamline is aligned up to yag3
- the slits are aligned to the beam
- the yag at TCC has been prealigned with the help of Questar 2 as well (for maximum accuracy) and the pin (the pin is used to measure the LPL spot size and set the plan of interaction)
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Go to the yag at TCC
code
Toggle Cloak language
Cloak py visibletheme true pyRDark linenumbers true op.yag() - Remove the hutch Be CRL
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Close slits 4 to 50 mic
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Cloak py visibletheme true pyRDark linenumbers true op.slit4.move(0.05) - Set a cross on Questar 1 screen and write down the X and Y positions in the preset spreadsheet of the experiment
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Close the pulse picker and reinsert the Be CRL
codeToggle Cloak language
Cloak py visibletheme true pyRDark linenumbers true op.pp.close()
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Move to the pinhole
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Cloak py visibletheme true pyRDark linenumbers true op.pinhole()
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Tweak the position of the pinhole until it is centered on the cross
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Cloak py visibletheme true pyRDark linenumbers true x.hex_y.tweak(0.02) x.tgx.tweak(0.02) -
Save the new pinhole position
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Cloak py visibletheme true pyRDark linenumbers true op.pinhole_s()
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Move back to the yag
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Cloak py visibletheme true pyRDark linenumbers true op.yag()
- Send the VISAR laser with event code 43 and enable the trigger
- Confirm that the focus of the VISAR provides a sharp and round image on any VISAR cameras (Visar gige 1 and 2)
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Tweak the focus of the visar position accordingly (50 mic steps is good enough)
codeToggle Cloak language
Cloak py visibletheme true pyRDark linenumbers true op.visar_z.tweak(0.05) - Turn off the VISAR trigger
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Prepare the system to check the front alignment of the drive lasers
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Cloak py visibletheme true pyRDark linenumbers true op.check_front_alignment()
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Check spatial overlap of the drive beams ABEF and GHIJ successively by centering the scattered signal on the cross of Questar 1 screen
codeToggle Cloak language
Cloak py visibletheme true pyRDark linenumbers true op.TTL_shutter.Toggle("openABEF") op.TTL_shutter.Toggle("closeGHIJ") x.lpl_west_x.tweak(0.05) x.lpl_west_y.tweak(0.05) op.TTL_shutter.Toggle("closeABEF") op.TTL_shutter.Toggle("openGHIJ") x.lpl_east_x.tweak(0.05) x.lpl_east_y.tweak(0.05)
- Record each positions of the VISAR and drive lenses in the experiment spreadsheet
Initial Temporal overlap between LPL and X-rays
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go to Ti sample
codeToggle Cloak language
Cloak py visibletheme true pyRDark linenumbers true op.ti() - remove the Be CRL
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open slit4 to 400 mic
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Cloak py visibletheme true pyRDark linenumbers true op.slit4.move(0.4) -
set full X-ray transmission
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Cloak py visibletheme true pyRDark linenumbers true op.SiT(1)
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open the pulse picker
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Cloak py visibletheme true pyRDark linenumbers true op.pp.open() -
Open the TCC scope
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Cloak py visibletheme true pyRDark linenumbers true op.scope_timing_remote() -
Set the EVR of the scope to 10Hz
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Cloak py visibletheme true pyRDark linenumbers true op.lpl_check_timing("10Hz") - Set channel 2 to 2 or 5 mV/div
- Confirm that the X-ray pulse is seen around 60 ns.
- Average over 100 sweep and save the trace on M2 (from C2)
- Set the sweep averaging back to 1
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Close the pulse picker
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Cloak py visibletheme true pyRDark linenumbers true op.pp.close()
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Insert the filter in front of Questar 1
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Cloak py visibletheme true pyRDark linenumbers true op.fw(num=1, position=3)
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Set the laser pulse shape to the timing shape
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Cloak py visibletheme true pyRDark linenumbers true op.LPL.psmenu() LXX op.LPL.psefc10Hz() -
Send the 10Hz LPL (enable the trigger of the ns slicer) on target at full energy
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Cloak py visibletheme true pyRDark linenumbers true op.HWPon('all', set_T=1.0) - Set the channel 2 to 10 mV/div
- Confirm you see a trace on C2
- Average over 100 sweep and save the trace on M3 (from C2)
- Set the sweep averaging back to 1
- Take a screenshot and post it to the elog
- Set the channel 2 to 1V/div
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Set the scope to single shot trigger
codeToggle Cloak language
Cloak py visibletheme true pyRDark linenumbers true op.lpl_check_timing("single") - Further fine timing can be done by using a LiF coated window
- Move to the appropriate target
- Confirm Be CRL are inserted in the beamline
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Set the timing of the drive to 0
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Cloak py visibletheme true pyRDark linenumbers true op.nstiming.mv(0e-9) -
Confirm that the streak window have zero offset in the window size requested
codeToggle Cloak language
Cloak py theme RDark linenumbers true op.streak_window(visar=1, window=20, offset=0) op.streak_window(visar=2, window=20, offset=0)
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Take a single refence only shot to observe the change in reflectivity at the arrival time of the X-rays
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Cloak py visibletheme true pyRDark linenumbers true op.ref_only( xray_trans=1, xray_num=1, shutters=False, dark=0, daq_end=True, calibrant="", rate=1, visar=True, save=True, slow_cam=False )
true To double check, confirm timing at another step
codeToggle Cloak language
Cloak py visibletheme true pyRDark linenumbers true op.nstiming.mv(10e-9) op.ref_only( xray_trans=1, xray_num=1, shutters=False, dark=0, daq_end=True, calibrant="", rate=1, visar=True, save=True, slow_cam=False )
- Confirm with the PI that timing is all set
true - Fine tune the timing is the X-ray trace is not where it is expected using the nstiming.mv function accordingly.
Check Spatial overlap between LPL, VISAR and X-rays on target
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Start by moving to the desired target (refer to the python manual here for details on the arguments)
codeToggle Cloak language
Cloak py visibletheme true pyRDark linenumbers true op.move_to_target(config="colinear", frame_cfg=[1, "F1", 1, "F2", 1, "F3"], frame=2, target="A2")
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Continue by checking the alignment of the drive lasers
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Set the system in a mode where the laser energy is minimum, the filter is removed from questar 1 and the trigger is enabled
codeToggle Cloak language
Cloak py visibletheme true pyRDark linenumbers true op.check_front_alignment()
- Confirm you see a scattering signal close to the X-ray cross (342, 561)
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Move the hexapod X axis to center the beams on the cross and produce a round scattering signal (steps of 50 mic is good)
codeToggle Cloak language
Cloak py visibletheme true pyRDark linenumbers true x.hex_x.tweak(0.05)
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- Continue by checking the alignment of the VISAR system
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Adjust the VISAR Z axis to make sure the image is round and sharp (could be set to the value by using the right equation as well). Steps of 50 mic is good.
codeToggle Cloak language
Cloak py visibletheme true pyRDark linenumbers true x.visar_z.tweak(0.05) -
Alternatively, move the Z value by exactly the thickness of the ablator + material of interest and add the change in position due to the visar window. To calculate the change use the following command
codeToggle Cloak language
Cloak py visibletheme true pyRDark linenumbers true op.visar_window_compensation(material="LiF", thickness=400e-6)
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Take reference images with VISAR and/or X-rays
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language | py |
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theme | RDark |
linenumbers | true |
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For 5 references with VISAR and X-rays (at 20% max)
Toggle Cloak Cloak visible true pyRDarktrue
Take a driven shot with the LPL
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language | py |
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theme | RDark |
linenumbers | true |
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For a driven shot at full energy (lpl_ener=1.0
...
), with X-rays arriving 5 ns later (timing=5.0e-9
...
) at full intensity (xray_trans=1
...
) use the following command
Toggle Cloak Cloak visible true pyRDarktrue