Minutes BWS Upgrade: Electro-Mechanical Design Meeting #7 -- 6th November 2015 --

Participants: Raymond Veness, Bernd Dehning, William Andreazza, Dmitri Gudkov, Paolo Magagnin, Pierre-Jean Lapray, Jose Luis Sirvent

Agenda ( http://indico.cern.ch/event/460286/ )

PDF Version here        Bernd's notes here

1. Follow Up Open Actions:

• Stepped vacuum chamber: Decided to keep 3 steps, new studies would be required to validate different design.
• Feedthrough Extension: Distances checked, no problem with extended feedthrough for integration.
• Airgap for resolver 0.25: Company contacted to check if is possible to increase.
• Absolute positioning of scanner: Accuracy Needed by <200um Referenced to nearby quads.

2. Communications:

• Journey to Alxion: Dmitry and Jonathan will go. (30th-Nov + 1st-Dec) The visit is still under question. Confirmation needed from CERN legal and purchasing services.
• Metallic disk shows better performance in non-reflective areas than glass disk, but roughness must be improved.
• SPS BWS Controller Installation
  • Firmware: Ok
  • Driver: Not yet ready
  • Testings shifted one week Week 46 --> Week 47

3. Integration considerations and actuator status. (D.Gudkov)

• Meeting with RF Impedance Team:
  • Required Resistance of Wire on SPS - (1Kohm -10Kohm).
  • Request of CF16 for Coupler - Already implemented on the 3D design. The interface changed from CF16 to CF40
• Meeting with Vacuum Team:
  • Additional pump for BWS in PSB required - Based on simulations with SPS proto
  • Agreed for 3D vacuum simulations with PSB design. Model needs to be provided.
  • CF DN100 interface required on each tank for vacuum pump - Already implemented on the 3D design.
  • Budget for new pump need to be foreseen ~12,5KCHF/pump
  • Materials testings on January'16
  • BE-OP required to understand better vacuum parameters on PSB.
• Design Status:
  • Four viewports integrated on design: No problem for integration, mounting/dismounting.
  • CF16 for RF coupler on the "back part" OK for integration but need to be changed by CF40 flange.
  • Schedule:
    • Drawing Approval --> December 2015
    • Launch Production --> January 2016
• Kollmorgen Test-Bench: Ready
• Alxion Special motor: Some pieces sent for cleaning and sent back.
• Comments:
  • Vacuum acceptance tests: Start with non-standard components (forks, Kapton wires, rotor, bearings...)
  • Need to re-define adjustment ranges and positions with Jonathan: To be seen on next meeting 19_11_2015.This point was discussed offline and solution was found.

4. Wire Scanner Shaft: Investigations and other news. (P.Magagnin)

• Space Reservation:
  • Requirements of optical fibre rack and other racks to be specified.
  • Already specified details about required cabling to be pulled.
• Aperture: Same for both locations and for both planes in PSB.
• Shaft Optimization:
  • Inertia increase from 2.94 to 5.43e-4 Kg*m2
  • Long discussion about screwing both parts of the shaft together
    • Paolo will give an estimate of forces in the screws

5. AOB

• How to proceed with BWS design for SPS?
  • PS, Booster & LHC same can be the same device with different forks?
  • SPS needs a different shaft lenght.
  • Currently for SPS there are pairs of scanners, requested to optimize. Scanners new placements optimized with respect to Beta function.
  • Discussion with Hannes required
• Request about putting a BWS on the PS
  • Not yet foreseen in schedule
  • Current PSB design may work on the two planes (William).
  • Schedule for YETS17?
• Discussion about wire mounting:
  • Procedure needs to start being considered
  • Proposal: Direct soldering the wire to fork
    • Vacuum considerations: Type of soldering element needed? Tin, Silver...
  • Tooling development for wire mounting is required (William already took it into consideration)
• Type of wire for the PSB:
  • Mathew could take a look for proposals.
  • Multiwire seems better from the heat point of view.
• SPS Optical Calibration Test-Bench:
  • Modification required for table usage with laboratory proto.
• BWS Laboratory Prototype:
  • Plexiglass cover needed for security.
  • Optical fibre support needed

6. New Actions: