Difference between revisions of "Spring 2021 - Rebuilding Photogun"

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(Depo chamber : Replace schneedle, fix pucks, opportunistic jobs)
 
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===Replace cathode electrode ===
 
* "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
 
* leak test large grain Nb cathode/ceramic/flange assembly : << carlos' logbook entry goes here >>
 
* fiducialize Nb cathode to 10" flange (old method glued fiducials)
 
* (maybe) fiducialize existing 10" flange to HV chamber
 
* vent HV chamber, remove cathode electrode, searching for puck tab
 
* fiducialize anode to HV chamber
 
* align cathode to anode
 
* align LM to cathode (after venting depo)
 
* align HV to chamber Y and re-align laser for retro-reflection
 
  
===Replace depo schneedle ===
+
===Depo chamber : Replace schneedle, fix pucks, opportunistic jobs===
* Make (2) SS schneedle w/o silver plating, replace depo chamber silver plated schneedle [[media:ACC2003000-0219 schneedle.pdf]]
+
* Vent Depo Chamber
* Galling reduced by addition of Mn and Si
+
: Pump out NF3, plan to leave leak valve as is ->> DONE 04/30/2021
* [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]  
+
: Vent Depo chamber (isolation valve - bake line - pump) ->> DONE 04/30/2021
* [https://www.associatedsteel.com/stainless-steels/17-4-stainless-steel-pump-shaft-stainless-custom-450-stainless-tgp-mir50/ Mir50]  
+
: Remove and mic pucks vs. series 30 series dwg, clean, fix [[media:JL0047248 PUCK BODY REV A.pdf]] [[media:MoPuckMount.docx]]
* NF3 leak value => leave as-is
+
:*[https://logbooks.jlab.org/entry/3875249 Pucks removed 04/30/2021]
* align mask, fix w/ two set screws
+
:*[https://logbooks.jlab.org/entry/3875347 Pucks measured 05/03/2021]
* replace K source with Alvatec Sb source?
+
: Pucks as of March 31 2021 [https://logbooks.jlab.org/entry/3873740 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
 +
:: 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
  
===Fix pucks===
+
===HV chamber : Replace cathode electrode ===
* Inspect and mic pucks against series 30 series dwg [[media:JL0047248 PUCK BODY REV A.pdf]] [[media:MoPuckMount.docx]]
+
* 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]]
 +
:[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
  
 
===Other jobs===
 
===Other jobs===
* Re-align HV chamber before venting?  => sent request to Gould
+
* Improve stalk heater driver motion => done, https://logbooks.jlab.org/entry/3871902
* (done) Repair stalk heater driver => https://logbooks.jlab.org/entry/3871902
+

Latest revision as of 14:11, 3 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
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