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=== | ||
| − | *Danny | + | * Assess fields to vacuum chamber, modified shed radius |
| − | + | Gabriel assess shed radius suggested by Danny, now => model 2.5 (w/ cross view) [[media:170328_Gabriel.pdf]] | |
| − | + | * S&A insulator measurements | |
| − | + | From Danny: S&A has given me the data in two batches. the first [[media:DT_L1782-1.pdf]] has to do with most of the dimensions, the second the contour of the ceramic. i've looked at the first batch, but not the second yet. here's what i think so far. hopefully, i'll look at the other data this afternoon. '''In summary, it's all acceptable.''' | |
| − | + | . | |
| − | + | a) both black ceramics are very close to being identical. | |
| − | + | b) both ceramics are all within tolerance of the model and drawings. | |
| − | + | c) the ceramic keyway is not perpendicular to the flange leak check groove as it should be, but it will still work. the leak check grooves in the chamber flange will not align with the leak check grooves on the ceramic flange. the keyway on the ceramic is off .6 degrees. fortunately the slots in the flange allow for +/- 1 degree rotation, but we used up some misalignment allowance that we didn't need to. | |
| − | + | d) the concentricity and perpendicularity of the end of the ceramic to the flange is within .006" and .2 degrees. | |
| − | * | + | e) the distance of the end of the ceramic to the flange face is .005" short. |
| − | + | f) all the dimensions are good enough for the adjustment we have in the anode. | |
| − | + | g) the data shows the 1.00" diameter end of the ceramic is too large by .001"-002". if so, it may not fit into the electrode. i went and measured it with some micrometers and believe it to be within tolerance. | |
| + | h) i'm not sure of the importance of the location of the triple point. it measures .006" high and .003" bigger radially. if i remember from previous discussions, that was not a big deal. can someone confirm that? | ||
| + | * ME design for shop ... goal is end of March !!! | ||
| + | a) Addressed a) correct shape for chamber (ball vs. tube), material (SS types, Nb), gradients for (triple point, insulator, chamber/NEG, cathode/anode), checked dimensions, resolved single part w/ new internal puck holder | ||
| + | b) Have complete due diligence, time to fabricate, differences between design/reality will be small/manageable | ||
| + | * Then ... vacuum fire electrode 900C, barrel polish, assemble to insulator | ||
| + | * Status of parts | ||
| + | a) Alumina ceramic bushing holder ready from shop [[media:170330_bushing.pdf]] | ||
| + | b) Ordered two centering ceramics - 4-6 weeks | ||
===Vacuum chamber/considerations=== | ===Vacuum chamber/considerations=== | ||
| − | * | + | * Retain leak valve, add right angle valve through first bake, at least |
| − | + | * Retain electrical isolation and NEG activation at 100C | |
| − | * | + | * Pick up ceramics, blow out NEG |
| − | |||
| − | |||
===Gun2 NEG Tube=== | ===Gun2 NEG Tube=== | ||
| − | * | + | * BPM discussion w/ Musson occurred on Monday, considerations: |
| − | [https://logbooks.jlab.org/entry/3468102 Logbook pic/layout of the existing Gun2 NEG] | + | a) Antenna : stripline or wire (mini or weld) [[media:170327_stripline.pdf]] |
| − | + | b) Position and orientation of antenna v. can for transmission line, length of antenna v. energy | |
| − | + | c) NEG coat surfaces of pipe, not can? TBD | |
| − | + | * Met in tunnel to develop first pass ME design [https://logbooks.jlab.org/entry/3468102 Logbook pic/layout of the existing Gun2 NEG] | |
| + | a) First iteration [[media:NEGTUBE_MARCH30.pdf]] | ||
| + | b) To keep the ratio the same between the antenna and the BPM wall to suit a 2.5" tube, the tube diameter of the BPM section will have to be about 5.50" O.D., so the conflat flange will be 8.00". | ||
| + | c) The two BPM spool pieces will be similar. the difference will be the direction the antennae will be pointing. | ||
===Gun3 Removal=== | ===Gun3 Removal=== | ||
| − | * | + | * Matt check with Willeke next week during JLEIC meeting Gun3 |
| − | [ | + | * Remove Gun3 table, rebuild 8" chamber w/ extractor, RGA, GP-100 on 80/20 stand, recoup Gun3 MFH solenoid |
| + | a) Planning for May | ||
| + | b) Marcy submitted [http://opsweb.acc.jlab.org/CSUEApps/atlis/task/17278 ATLIS task] for the job | ||
| − | + | === Eliminating Gun Switch Software === | |
| − | |||
===Spellman HVPS update=== | ===Spellman HVPS update=== | ||
| − | + | * Time to get Mike Johnson started on Spellman at UITF? | |
| − | + | a) John/Brad trying to communicate to Spellman w/ their software | |
| + | b) Need old version of JAVA to get started | ||
| + | |||
===Radmon update=== | ===Radmon update=== | ||
Latest revision as of 06:42, 31 March 2017
New action items
Electrode/insulator design/fabrication
- Assess fields to vacuum chamber, modified shed radius
Gabriel assess shed radius suggested by Danny, now => model 2.5 (w/ cross view) media:170328_Gabriel.pdf
- S&A insulator measurements
From Danny: S&A has given me the data in two batches. the first media:DT_L1782-1.pdf has to do with most of the dimensions, the second the contour of the ceramic. i've looked at the first batch, but not the second yet. here's what i think so far. hopefully, i'll look at the other data this afternoon. In summary, it's all acceptable. . a) both black ceramics are very close to being identical. b) both ceramics are all within tolerance of the model and drawings. c) the ceramic keyway is not perpendicular to the flange leak check groove as it should be, but it will still work. the leak check grooves in the chamber flange will not align with the leak check grooves on the ceramic flange. the keyway on the ceramic is off .6 degrees. fortunately the slots in the flange allow for +/- 1 degree rotation, but we used up some misalignment allowance that we didn't need to. d) the concentricity and perpendicularity of the end of the ceramic to the flange is within .006" and .2 degrees. e) the distance of the end of the ceramic to the flange face is .005" short. f) all the dimensions are good enough for the adjustment we have in the anode. g) the data shows the 1.00" diameter end of the ceramic is too large by .001"-002". if so, it may not fit into the electrode. i went and measured it with some micrometers and believe it to be within tolerance. h) i'm not sure of the importance of the location of the triple point. it measures .006" high and .003" bigger radially. if i remember from previous discussions, that was not a big deal. can someone confirm that?
- ME design for shop ... goal is end of March !!!
a) Addressed a) correct shape for chamber (ball vs. tube), material (SS types, Nb), gradients for (triple point, insulator, chamber/NEG, cathode/anode), checked dimensions, resolved single part w/ new internal puck holder b) Have complete due diligence, time to fabricate, differences between design/reality will be small/manageable
- Then ... vacuum fire electrode 900C, barrel polish, assemble to insulator
- Status of parts
a) Alumina ceramic bushing holder ready from shop media:170330_bushing.pdf b) Ordered two centering ceramics - 4-6 weeks
Vacuum chamber/considerations
- Retain leak valve, add right angle valve through first bake, at least
- Retain electrical isolation and NEG activation at 100C
- Pick up ceramics, blow out NEG
Gun2 NEG Tube
- BPM discussion w/ Musson occurred on Monday, considerations:
a) Antenna : stripline or wire (mini or weld) media:170327_stripline.pdf b) Position and orientation of antenna v. can for transmission line, length of antenna v. energy c) NEG coat surfaces of pipe, not can? TBD
- Met in tunnel to develop first pass ME design Logbook pic/layout of the existing Gun2 NEG
a) First iteration media:NEGTUBE_MARCH30.pdf b) To keep the ratio the same between the antenna and the BPM wall to suit a 2.5" tube, the tube diameter of the BPM section will have to be about 5.50" O.D., so the conflat flange will be 8.00". c) The two BPM spool pieces will be similar. the difference will be the direction the antennae will be pointing.
Gun3 Removal
- Matt check with Willeke next week during JLEIC meeting Gun3
- Remove Gun3 table, rebuild 8" chamber w/ extractor, RGA, GP-100 on 80/20 stand, recoup Gun3 MFH solenoid
a) Planning for May b) Marcy submitted ATLIS task for the job
Eliminating Gun Switch Software
Spellman HVPS update
- Time to get Mike Johnson started on Spellman at UITF?
a) John/Brad trying to communicate to Spellman w/ their software b) Need old version of JAVA to get started