Difference between revisions of "Spring 2021 - Rebuilding Photogun"

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===Other jobs===
 
−
* Re-align HV chamber before venting?  => sent request to Gould
 
−
* (done) Repair stalk heater driver => https://logbooks.jlab.org/entry/3871902
 
  
−
===Replace cathode electrode ===
+
===Depo chamber : Replace schneedle, fix pucks, opportunistic jobs===
−
* leak test large grain Nb cathode/ceramic/flange assembly
+
* Vent Depo Chamber
−
* fiducialize Nb cathode to 10" flange (old method glued fiducials)
+
: Pump out NF3, plan to leave leak valve as is ->> DONE 04/30/2021
−
* (maybe) fiducialize existing 10" flange to HV chamber
+
: Vent Depo chamber (isolation valve - bake line - pump) ->> DONE 04/30/2021
−
* vent HV chamber, remove cathode electrode, searching for puck tab
+
: Remove and mic pucks vs. series 30 series dwg, clean, fix [[media:JL0047248 PUCK BODY REV A.pdf]] [[media:MoPuckMount.docx]]
−
* fiducialize anode to HV chamber
+
:*[https://logbooks.jlab.org/entry/3875249 Pucks removed 04/30/2021]
−
* align cathode to anode
+
:*[https://logbooks.jlab.org/entry/3875347 Pucks measured 05/03/2021]
−
* align LM to cathode (after venting depo)
+
: Pucks as of March 31 2021 [https://logbooks.jlab.org/entry/3873740 Link to UITFLOG entry]
−
* align HV to chamber Y and re-align laser for retro-reflection
+
::[[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
 +
::* [https://www.hpalloy.com/Alloys/descriptions/NITRONIC60.aspx?kw=%2Bnitronic%20%2B60&cpn=48402520&utm_term=%2Bnitronic%20%2B60&utm_campaign=NITRONIC&utm_source=adwords&utm_medium=ppc&hsa_net=adwords&hsa_tgt=kwd-41394160017&hsa_ad=393453120372&hsa_acc=6124394374&hsa_grp=1610180530&hsa_mt=b&hsa_cam=48402520&hsa_kw=%2Bnitronic%20%2B60&hsa_ver=3&hsa_src=g&gclid=EAIaIQobChMIzJv0vOnp7wIVypyzCh0bPAmCEAAYASAAEgLYn_D_BwE Nitronic 60 data sheet] (Nitronic trademark AK Steel)
 +
::* won't use this ... although probably not a problem, can be mildly magnetic [https://www.associatedsteel.com/stainless-steels/17-4-stainless-steel-pump-shaft-stainless-custom-450-stainless-tgp-mir50/ Mir50] (Mir50 trademark ASC Steel)
 +
::*[https://logbooks.jlab.org/entry/3875344 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
  
−
===Replace depo schneedle ===
+
===HV chamber : Replace cathode electrode ===
−
* Make (2) SS schneedle w/o silver plating, replace depo chamber silver plated schneedle [[media:ACC2003000-0219 schneedle.pdf]]
+
* Electrode Prep Work
−
* NF3 leak value => leave as-is
+
:*"old" existing electrode here : https://wiki.jlab.org/ciswiki/index.php/CIS-ASY-R28-3
−
* align mask, fix w/ two set screws
+
:*"new" niobium electrode here : https://wiki.jlab.org/ciswiki/index.php/CIS-ASY-R28-1
−
* replace K source with Alvatec Sb source?
+
:: 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]]
 +
:[https://logbooks.jlab.org/entry/3874561 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
  
−
===Fix pucks===
+
===Other jobs===
 +
* Improve stalk heater driver motion => done, https://logbooks.jlab.org/entry/3871902

Latest revision as of 18:30, 25 May 2021

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 (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
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

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