Difference between revisions of "Spring 2021 - Rebuilding Photogun"

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===HV chamber : Replace cathode electrode ===
===HV chamber : Replace cathode electrode ===
* Electrodes
* Electrode Prep Work
:*"old" existing electrode here : https://wiki.jlab.org/ciswiki/index.php/CIS-ASY-R28-3
:*"old" existing electrode here : https://wiki.jlab.org/ciswiki/index.php/CIS-ASY-R28-3
:*"new" niobium electrode here : https://wiki.jlab.org/ciswiki/index.php/CIS-ASY-R28-1
:*"new" niobium electrode here : https://wiki.jlab.org/ciswiki/index.php/CIS-ASY-R28-1

Revision as of 06:39, 14 April 2021

Depo chamber : Replace schneedle, fix pucks, opportunistic jobs

  • Vent Depo Chamber
Pump out NF3, plan to leave leak valve as is
Vent Depo chamber
Remove and mic pucks vs. series 30 series dwg, clean, fix media:JL0047248 PUCK BODY REV A.pdf media:MoPuckMount.docx
Replace K source with Alvatec Sb source
Replace w/ Nitronic schneedle (make sure fit to pucks good first), set alignment into electrode w/o or w/ puck
Make (2) SS schneedle w/o silver plating, replace depo chamber silver plated schneedle media:ACC2003000-0219 schneedle.pdf
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)
Return 10" flange
Align mask to puck on heater, fix mask

HV chamber : Replace cathode electrode

  • Electrode Prep Work
LgGnNb leak check => done 4/8, Carlos leak tested complete assembly in 1137
LgGnNb fiducialize =>
  • Alignment Jobs in Cave
Walk job with Carlos & Chris => done 4/7
S&A perform an as-found of the Gun through Y chamber => media:210414_UITF_15degLine_Summary.xlsx
Matt's "Have-Want" summary pics media:210414_HaveWant.pptx
Decide if we want to run beam before venting => don't think so, agree at 4/15 UITF meeting
  • Vent HV Chamber to replace cathode
Start depo jobs first to be ready for manipulator alignment
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

Other jobs