March 24, 2017 - 200kV gun upgrade meeting

New action items

Electrode/insulator design/fabrication

Danny/Gabriel/Carlos will iterate on final design : minimize gap over triple point, optimize ceramic/metal gap curvature

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

Plan is to vacuum fire 900C, barrel polish before attaching to ceramic

Reuse springs/rollers/cage, but new rear support ring optimized for electrode

Collect as-found on white insulator assembly and black insulator

Finalize design by next week, get to shop

Vacuum chamber/considerations

Plan A - 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 - 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

Gun2 NEG Tube

As-found of existing Gun2 NEG

Find/leak check cans

Give Danny sketch of sequence for new tube w/ BPM's + magnets, eliminate/shorten downstream bellows

All assembled FH solenoids spoken for; take from Gun3, maybe spare parts, or fabricate new coils

Gun3

Retain downstream chamber w/ extractor, RGA, GP-100 w/o NF3/Cs

Remove gun table and HV section

As-found of existing Gun3

Spellman HVPS update...

Radmon update...