Spring 2021 - Rebuilding Photogun

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Depo chamber : Replace schneedle, fix pucks, opportunistic jobs

  • Vent Depo Chamber
Pump out NF3, plan to leave leak valve as is ->> DONE 04/30/2021
Vent Depo chamber (isolation valve - bake line - pump) ->> DONE 04/30/2021
Remove and mic pucks vs. series 30 series dwg, clean, fix media:JL0047248 PUCK BODY REV A.pdf media:MoPuckMount.docx
Pucks as of March 31 2021 Link to UITFLOG entry
Media:UITF pucks in HV and prep chambers as of March 31 2021.jpg
HV chamber
Puck # 14 is missing its tab (ear). It has bulk GaAs last activated March 31 2021, good QE
Depo chamber
Puck # 31 Bulk GaAs Used many times, not very good QE
Puck # 8 Bulk GaAs used as dummy for HV conditioning
Puck # 22 SSL perhaps never activated?
Add pucks => new bulk GaAs on X pucks + special one for HV conditioning?
Replace K source with Alvatec Sb source :https://logbooks.jlab.org/entry/3878165 SbPt bead on W wire installed as Sb source
Mamun found Russ' Sb req : https://misportal.jlab.org/reqs/pr/viewPrPo.do?prNum=315281
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
Return 10" flange
Align floppy 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 => done, Chris provide Carlos this info to compare assembly to assembly Media:R28_3_S&A_Inspection_Apr-14-2021.xlsx
  • 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:UITF Y Chamber Line April 22 2021.xlsx
Link to UITFLOG entry on SA& results and comments
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 (isolation valve - bake pump - turbo)
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