9.4.2.0 Spatio-temporal alignment procedure

test:Excel spreadsheet for the FEL settings is here.

• Spatial overlap of the optical lasers (drive and VISAR) with X-rays
  

  • Start by moving to the desired target (refer to the python manual here for details on the arguments)
    

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

• • Continue by checking the alignment of the drive lasers

    • Decrease the energy of the laser to its minimum

      op.HWPon("all", set_T=0)

    • Confirm the filter of Questar 1 is in position 2 (no filter) to allow all wavelength to be seen
    • Adjust the signal on the camera my moving the slider 'max' to the maximum value and set the gain to 0
    • Set the NsSlicer to 10Hz and then click on the corresponding button which says 'ENB'
    • 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

      x.tg_x.umvr(50e-6)

• • 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)

      x.visar_z.umvr(50e-6)

    • Alternatively, move the Z value by exactly the hitckness of the ablator + material of interest and add the change in position due to the visar window

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

• Take a reference

  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

  op.optical_shot(
  	shutter_close=[1, 2, 3, 4, 5, 6],
  	lpl_ener=0.3,
  	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
  )

• Temporal overlap
  

  • go to Ti sample

    op.ti()