test:Excel spreadsheet for the FEL settings is here.
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- Spatial overlap
move to target
Code Block language py theme RDark linenumbers true op.move_to_target(config="coliner", frame_cfg=[1, "F1", 1, "F2", 1, "F3"], frame=2, target="A2
send drive at low power to check overlap
Code Block language py theme RDark linenumbers true op.HWPon("all", set_T=0)
- move hexapod X to confirm overlap of both set of beams and have them centered on X-ray cross at (342, 561)
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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)
Go to the yag at TCC
Toggle Cloak Cloak visible true pyRDarktrue - Remove the hutch Be CRL
Close slits 4 to 50 mic
Toggle Cloak Cloak visible true pyRDarktrue - Set a cross on Questar 1 screen and write down the X and Y positions in the preset spreadsheet of the experiment
Close the pulse picker and reinsert the Be CRL
Toggle Cloak Cloak visible true pyRDarktrue Move to the pinhole
Toggle Cloak Cloak visible true pyRDarktrue Tweak the position of the pinhole until it is centered on the cross
Toggle Cloak Cloak visible true pyRDarktrue Save the new pinhole position
Toggle Cloak Cloak visible true pyRDarktrue Move back to the yag
Toggle Cloak Cloak visible true pyRDarktrue - 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)
Tweak the focus of the visar position accordingly (50 mic steps is good enough)
Toggle Cloak Cloak visible true pyRDarktrue - Turn off the VISAR trigger
Prepare the system to check the front alignment of the drive lasers
Toggle Cloak Cloak visible true pyRDarktrue Check spatial overlap of the drive beams ABEF and GHIJ successively by centering the scattered signal on the cross of Questar 1 screen
Toggle Cloak Cloak visible true pyRDarktrue - Record each positions of the VISAR and drive lenses in the experiment spreadsheet
Initial Temporal overlap between LPL and X-rays
go to Ti sample
Toggle Cloak Cloak visible true pyRDarktrue - remove the Be CRL
open slit4 to 400 mic
Toggle Cloak Cloak visible true pyRDarktrue set full X-ray transmission
Toggle Cloak Cloak visible true pyRDarktrue open the pulse picker
Toggle Cloak Cloak visible true pyRDarktrue Open the TCC scope
Toggle Cloak Cloak visible true pyRDarktrue Set the EVR of the scope to 10Hz
Toggle Cloak Cloak visible true pyRDarktrue - 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
Close the pulse picker
Toggle Cloak Cloak visible true pyRDarktrue Insert the filter in front of Questar 1
Toggle Cloak Cloak visible true pyRDarktrue Set the laser pulse shape to the timing shape
Toggle Cloak Cloak visible true pyRDarktrue Send the 10Hz LPL (enable the trigger of the ns slicer) on target at full energy
Toggle Cloak Cloak visible true pyRDarktrue - 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
Set the scope to single shot trigger
Toggle Cloak Cloak visible true pyRDarktrue - 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
Set the timing of the drive to 0
Toggle Cloak Cloak visible true pyRDarktrue Confirm that the streak window have zero offset in the window size requested
Toggle Cloak Cloak pyRDarktrue Take a single refence only shot to observe the change in reflectivity at the arrival time of the X-rays
Toggle Cloak Cloak visible true pyRDarktrue To double check, confirm timing at another step
Toggle Cloak Cloak visible true pyRDarktrue - 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
Start by moving to the desired target (refer to the python manual here for details on the arguments)
Toggle Cloak Cloak visible true pyRDarktrue
Continue by checking the alignment of the drive lasers
Set the system in a mode where the laser energy is minimum, the filter is removed from questar 1 and the trigger is enabled
Toggle Cloak Cloak visible true pyRDarktrue - Confirm you see a scattering signal close to the X-ray cross (342, 561)
Move the hexapod X axis to center the beams on the cross and produce a round scattering signal (steps of 50 mic is good)
Toggle Cloak Cloak visible true pyRDarktrue
- Continue by checking the alignment of the VISAR system
Adjust the VISAR Z axis
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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.
Toggle Cloak Cloak visible true pyRDarktrue 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
Toggle Cloak Cloak visible true pyRDarktrue
Take reference images with VISAR and/or X-rays
For 5 references with VISAR and X-rays (at 20% max)
Toggle Cloak Cloak visible true pyRDarktrue
Take a driven shot with the LPL
For a driven shot at full energy (lpl_ener=1.0), with X-rays arriving 5 ns later (
- Take a reference
Code Block language py theme RDark linenumbers true op.ref_only( xray_trans=0.2, xray_num=5, shutters=False, dark=0, daq_end=True, calibrant="", rate=1, visar=True, save=True, slow_cam=False )
Take a shot
Code Block op.optical_shot( shutter_close=[1, 2, 3, 4, 5, 6], lpl_ener=0.3,language py theme RDark linenumbers true timing=5.0e-9
) at full intensity (xray_trans=1
, xray_threshold=0.2, save=True, daq_end=True, auto_trig=True, auto_charge=True, visar=True, debug=False, ps_opt=True )- Saisissez votre tâche ici, en utilisant « @ » pour l'attribution à un utilisateur et « // » pour sélectionner une date d'échéance
) use the following command
Toggle Cloak Cloak visible true pyRDarktrue