Page History

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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
  

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  op.yag()

•  Remove the hutch Be CRL
•  

  Close slits 4 to 50 mic

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  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
•  

  Move to the pinhole

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  op.pinhole()

•  

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

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

•  

  Save the new pinhole position

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  op.pinhole_s()

•  

  Move back to the yag

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  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)

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  op.visar_z.tweak(0.05)

•  Turn off the VISAR trigger
•  

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

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  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

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  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

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  op.ti()

•  remove the Be CRL
•  

  open slit4 to 400 mic

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  op.slit4.move(0.4)

•  

  set full X-ray transmission

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  op.SiT(1)

•  

  open the pulse picker

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  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)
  

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  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

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    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)
    

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    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.
    

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    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

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    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

...

go to Ti sample

op.ti()

...

open slit4 to 400 mic

op.slit4.move(0.4)

...

set full X-ray transmission

op.SiT(1)

...

open the pulse picker

...

...

)