Mu2e ESS engineering meeting

Tuesday 24 Nov 2015, 09:00 → 10:00 US/Central

Drafting Meeting Room

Vladimir Nagaslaev (Fermilab)

Tuesday, November 24, 2015

 

1. Specification document
   1. Change horizontal motion from 5mm to 0.5”
   2. Specify the range when applicable
   3. Add specs for the cathode alignment
   4. Need to do ES field calculations to determine CE location and shape constraints
   5. Some safety margin is built into the spec numbers. 40mm vertical gap on jaws is conservative
   6. Will create an ED document in the Teamcenter
2. Dave presented the design of a single spring retraction small prototype
   1. Full foil retraction length is 2.25”
   2. Full foil assembly length is 2.5”
   3. Vertical extension of the CE is 60mm. This needs to be verified with the ES FEA analysis. Will ask Brian Hartsell to help with this.
   4. Choice of springs:
   5. Will go with the first line
   6.  

Drawings are ready to be issued for the machine shop fabrication

7. Can use half of the remaining 12” billet
8. The clearing electrodes can be added later to prototype them as well
9. Go ahead with the fabrication

3. Mike presented the design of a cantilevered spring small prototype
   1. Clever combination of 2 springs in one line.
   2. Could more space be saved by moving the nesting point of the spring further down? This may be constrained by the full length of the chain – need to exercise.
   3. Need to draw the baffle
   4. Instead of calculating the spring wire diameter, will order several spring wire samples to exercise with them and choose the most appropriate.
   5. Could be able to drill the hole directly in the wire for the spring-spring connection.
   6. Will look at #b and #c options and then will submit for production. With this week being short – will revisit next Tuesday.
4. Matt:  Status of the dual spring prototype fabrication:
   1. Fixture production delayed by broken EDM machine. It is fixed now and delivery expected early next week
   2. Failed to machine fine notches in the shims – will not do them
   3. Tubes (ferrules) are done
   4. Miscommunication on production of the shims for WESGO: asked 250; made 25 – will continue while the vendor is waiting and working on the fixture
   5. Dowel pins are in the machine shop
   6. Vendor: springs will arrive on Dec. 4 – don’t we have springs?!
   7. Have retraction springs for the dual prototype in hands
   8. Expect delivery of the tension springs from the vendor on December 4 (vendor will try to expedite if possible)
   9. Using the WH machine shop
   10. Frame has been machined, now finishing- drilling holes
   11. Expect to start the foil production next week. Sent email to Wanda to see her availability.
   12. Salli is not in the vacuum group at NWA anymore!!! Transferred to the MI60 high bay techs group (group head is Michael Rauchmiller, aka Rocky) as the manpower maneuvering in the AD.
5. Question: what is the maximum voltage with the cathode gap of 10mm? Answer we will not want to go beyond 110kV. This will be limited by the foil deflection.
6. Matt’s abstract for the IPAC-16 conference
   1. Deadline – December 9.
   2. Small prototype is not a strong enough contribution to the IPAC conference. Proposed to present the full scale prototype and design R&D studies.
7. Discussion with Denton on the MI spill regulation for the SeaQuest
   1. SeaQuest suffered from spill non-uniformities – big delays in data taking
   2. 3 regulation systems:
      1. QXR – two air-core quads (1 on ceramic pipe, 1-ss pipe)
      2. Bucker – 1 air-core quad on ceramic pipe, 7kHz BW, 1.5m
      3. Quad RF damper
      4. Also: 400 quads around the ring – regulation at 1e-5 of the full tune
   3. Ideal spill uniformity would be 87% DF due to the abort gap
   4. With regulation could make it to 47%
   5. Main issue- 53MHz buckets from Booster vary in width and intensity. Cannot regulate the 53MHz structure.
   6. Mu2e will not have issue with the 53MHz structure