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- 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 Block language py theme RDark linenumbers true op.yag()
- Remove the hutch Be CRL
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Close slits 4 to 50 mic
Code Block language py theme RDark 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
- Close the pulse picker and reinsert the Be CRL
Code Block language py theme RDark linenumbers true op.pp.close()
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Move to the pinhole
Code Block language py theme RDark linenumbers true op.pinhole()
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Tweak the position of the pinhole until it is centered on the cross
Code Block language py theme RDark linenumbers true x.hex_y.tweak(0.02) x.tgx.tweak(0.02)
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Save the new pinhole position
Code Block language py theme RDark linenumbers true op.pinhole_s()
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Move back to the yag
Code Block language py theme RDark 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)
Code Block language py theme RDark 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
Code Block language py theme RDark 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
Code Block language py theme RDark 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
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