Spring 2021 - Rebuilding Photogun

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HV chamber : Replace cathode electrode

  • Electrodes
  • 4/8 Leak check good, cathode assembly going to S&A for fiducials
  • 4/7 Walked S&A jobs w/ Chris, agreed to following:
S&A Gun-to-Y as found 4/9, tell us about Y ports, NEG tube and where cathode is pointing, no idea about anode
We decide if we want to do/move anything and run beam again
We decide when to vent HV and Depo, remembering to look for schneedle, clean out Ag flakes
S&A will fiducialize upstream anode face in UITF
S&A will be able to help us align new schneedle where cathode will go
S&A will be able to align cathode to anode
S&A will be able to align cathode/anode combo on whatever line we want (thinking Y ports)
CIS follows up for puck in/out tests, and laser alignment

Depo chamber : Replace schneedle, fix pucks, opportunistic jobs

4/6 - Shop is fabricating two, trying to have one ready by 4/18
one from 316 or 316L SS and one from Nitronic 60 https://mis.jlab.org/mis/apps/job_request/mshop/view_request.cfm?request_id=330210&code=1
  • Nitronic 60 data sheet (Nitronic trademark AK Steel)
  • won't use this ... although probably not a problem, can be mildly magnetic Mir50 (Mir50 trademark ASC Steel)

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