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
- 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
- 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)
- 316L SS and Nitronic schneedles made, cleaned and tested in pucks #8, #22, and #31
- Return 10" flange
- Align floppy mask to puck on heater, fix mask (comments: Marcy and Mamun looked at the mask assembly, the two screws that hold the mask on the rod are found tight, it is teh rod that wobble, we experience similar wobbling at GTS mask assembly too. :https://logbooks.jlab.org/entry/3878166
HV chamber : Replace cathode electrode
- Electrode Prep Work
- "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
- 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
- Improve stalk heater driver motion => done, https://logbooks.jlab.org/entry/3871902