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Is there an issue? Escalation Path

  • Issue concerns X-ray beam delivery: see here
  • Issue concerns ECS: see here

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

    op.yag()
  • Remove the hutch Be CRL

  • Close slits 4 to 50 mic

    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
  • Close the pulse picker and reinsert the Be CRL
    op.pp.close()

  • Move to the pinhole

    op.pinhole()

  • Tweak the position of the pinhole until it is centered on the cross

    x.hex_y.tweak(0.02)
x.tgx.tweak(0.02)

  • Save the new pinhole position

    op.pinhole_s()

  • Move back to the yag

    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)

  • Tweak the focus of the visar position accordingly (50 mic steps is good enough)

    op.visar_z.tweak(0.05)
  • Turn off the VISAR trigger

  • Prepare the system to check the front alignment of the drive lasers

    op.check_front_alignment()

  • Check spatial overlap of the drive beams ABEF and GHIJ successively by centering the scattered signal on the cross of Questar 1 screen

    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

  • go to Ti sample

    op.ti()
  • remove the Be CRL

  • open slit4 to 400 mic

    op.slit4.move(0.4)

  • set full X-ray transmission

    op.SiT(1)

  • open the pulse picker

    op.pp.open()

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)

    op.move_to_target(config="colinear", frame_cfg=[1, "F1", 1, "F2", 1, "F3"], frame=2, target="A2")

  • 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

      op.check_front_alignment()
    • 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)

      x.hex_x.tweak(0.05)
  • Continue by checking the alignment of the VISAR system

    • 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.

      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

      op.visar_window_compensation(material="LiF", thickness=400e-6)

Take reference images with VISAR and/or X-rays

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 driven shot with the LPL

op.optical_shot(
	shutter_close=[1, 2, 3, 4, 5, 6],
	lpl_ener=1.0,
	timing=5.0e-9
	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
)
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