Difference between revisions of "March 31, 2017 - 200kV gun upgrade meeting"

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(Created page with "== New action items == ===Electrode/insulator design/fabrication=== *Danny/Gabriel/Carlos will iterate on final design : minimize gap over triple point, optimize ceramic/meta...")
 
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===Electrode/insulator design/fabrication===
 
===Electrode/insulator design/fabrication===
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*Danny/Gabriel/Carlos will iterate on final design : minimize gap over triple point, optimize ceramic/metal gap curvature
+
* Fields to vacuum chamber
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Finalize electrostatic design [[media:170324_FinalDesign.pptx]]
+
* Modify shed radius
−
Finalize ME design [[media:JL0045108---dwg1.pdf]]
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* Final ME design
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*Build electrode/shed from one piece of material 8" cube, not enough Nb, go w/ SS.  Matt will check on 316LN vacuum melt, but let's still check what shop used for 350kV ball electrodes, maybe save time and money
+
* Internal parts
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From Carlos: I stopped by the machine shop and Casey confirms that they have in stock 316L (low Carbon) for the electrodes. I showed him the picture of the GTS/UITF shed and he says the material is not hard to come buy, not sure if it comes form same vendor but material should have very similar properties. This is what he replied: The following message was sent to: Carlos Hernandez-Garcia from the staff search page.  I have 316L for your projects.
+
*Plan is to vacuum fire electrode 900C, barrel polish before attaching to ceramic
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*Reuse springs/rollers/cage, but new rear support ring optimized for electrode
 
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qty 6 roller springs. [[media:32709-02221_C_1of1.pdf]]
 
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qty 6 roller pins. [[media:ACC2003000-0317.pdf]]
 
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qty 1 key [[media:ACC2003000-0315.pdf]]
 
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*Collect as-found on white insulator assembly and black insulator
 
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ILC Nb Gun2 white ceramic design [[media:WHITECERAMICQA.pdf]]
 
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Surveys on Monday
 
  
 
===Vacuum chamber/considerations===
 
===Vacuum chamber/considerations===
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*Plan A
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* Use as-is, but identify/repair short of NEG isolation, retain leak valve but add right angle for isolation. Do we forego NEG isolation and remove unnecessary ceramic plates (fallen to bottom of chamber)
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Use as-is, but identify/repair short of NEG isolation, retain leak valve but add right angle for isolation. Do we forego NEG isolation and remove unnecessary ceramic plates (fallen to bottom of chamber)
 
−
* Plan B
 
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Rotate NEG's => remove NEG's, weld support rods, NEG coat chamber, return X number of NEGs, new ground screen, retain leak valve w/ right angle valve
 
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*Plan is to vacuum fire electrode 900C, barrel polish before attaching to ceramic
 
  
 
===Gun2 NEG Tube===
 
===Gun2 NEG Tube===
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*Document Gun2 as-found. Give Danny sketch of sequence for new tube w/ BPM's + magnets, eliminate/shorten downstream bellows
+
* BPM discussion w/ Musson happened last Monday
 +
** Plan A :
 +
** Plan B : Consider using more wires to measure position and moments a.k.a. spot size
 +
* Re-use Gun3 NEG solenoid
 +
* Met in tunnel to develop first pass ME design
 
  [https://logbooks.jlab.org/entry/3468102 Logbook pic/layout of the existing Gun2 NEG]
 
  [https://logbooks.jlab.org/entry/3468102 Logbook pic/layout of the existing Gun2 NEG]
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*Find materials for new Gun2 NEG tube
 
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Found/leak checked two large aperture BPM cans [[Media:Gun2_IMG_5144.JPG]]
 
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All assembled FH solenoids spoken for; take from Gun3, maybe spare parts, or fabricate new coils
 
  
 
===Gun3 Removal===
 
===Gun3 Removal===
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*Retain downstream chamber w/ extractor, RGA, GP-100 w/o NF3/Cs, and remove gun table and HV section
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* Matt check with Willeke next week for Gun3
−
[https://logbooks.jlab.org/entry/3468102 As-found of existing Gun3]
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* Marcy submitted [http://opsweb.acc.jlab.org/CSUEApps/atlis/task/17278 ATLIS task] for the job
 +
* Remove Gun3 table, rebuild 8" chamber w/ extractor, RGA, GP-100 on 80/20 stand
 +
* Recoup Gun3 MFH solenoid
 +
* Planning for May
 +
 
 +
=== Eliminating Gun Switch software Gun3 ===
  
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*Eliminating Gun Switch software Gun3
 
−
  Hello Joe,  I'm coordinating with Scott to rewrite the gun switch software for one gun operations. Looks like we are going to gut most of additional gun code simplifying the solution we currently have. For the front end, I  wanted to meet with you to get an idea of what things you're looking for on the screen. I'll be on shift next week Monday - Wednesday from 2-10 to support the injector work. Hopefully we can talk then.  Best Kyle.
 
  
 
===Spellman HVPS update===
 
===Spellman HVPS update===
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Now there are two ... one for Mike Johnson EPICS development, one for HV chamber testing using Spellman GUI.  [[Media:Gun2_IMG_5153.JPG]]
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* Mike Johnson has been working on Laser Frequency Divider
−
+
* Time to get him started on Spellman at UITF?
 +
 
 
===Radmon update===
 
===Radmon update===

Revision as of 12:18, 30 March 2017

New action items

Electrode/insulator design/fabrication

  • Fields to vacuum chamber
  • Modify shed radius
  • Final ME design
  • Internal parts
  • Plan is to vacuum fire electrode 900C, barrel polish before attaching to ceramic

Vacuum chamber/considerations

  • Use as-is, but identify/repair short of NEG isolation, retain leak valve but add right angle for isolation. Do we forego NEG isolation and remove unnecessary ceramic plates (fallen to bottom of chamber)

Gun2 NEG Tube

  • BPM discussion w/ Musson happened last Monday
    • Plan A :
    • Plan B : Consider using more wires to measure position and moments a.k.a. spot size
  • Re-use Gun3 NEG solenoid
  • Met in tunnel to develop first pass ME design
Logbook pic/layout of the existing Gun2 NEG

Gun3 Removal

  • Matt check with Willeke next week for Gun3
  • Marcy submitted ATLIS task for the job
  • Remove Gun3 table, rebuild 8" chamber w/ extractor, RGA, GP-100 on 80/20 stand
  • Recoup Gun3 MFH solenoid
  • Planning for May

Eliminating Gun Switch software Gun3

Spellman HVPS update

  • Mike Johnson has been working on Laser Frequency Divider
  • Time to get him started on Spellman at UITF?

Radmon update

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