Difference between revisions of "Spring 2021 - Rebuilding Photogun"
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| Line 14: | Line 14: | ||
::Puck # 22 SSL perhaps never activated? | ::Puck # 22 SSL perhaps never activated? | ||
: Add pucks => new bulk GaAs on X pucks + special one for HV conditioning? | : Add pucks => new bulk GaAs on X pucks + special one for HV conditioning? | ||
| − | : Replace K source with Alvatec Sb source = | + | : Replace K source with Alvatec 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 | : 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]] | :: Make (2) SS schneedle w/o silver plating, replace depo chamber silver plated schneedle [[media:ACC2003000-0219 schneedle.pdf]] | ||
Revision as of 14:48, 20 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 (isolation valve - bake line - pump)
- 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
- 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)
- Return 10" flange
- Align floppy mask to puck on heater, fix mask
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 will provide Carlos this info to compare assembly to assembly
- 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 (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