Minutes BWS Upgrade: Electro-Mechanical Design Meeting #5 -- 4th September 2015 --

Participants: Raymond Veness, Bernd Dehning, William Andreazza, Paolo Magagnin, Dmitry Gudkov, Pierre-Jean Lapray, Nicolas Chritin, Jose Luis Sirvent Blasco

Agenda (http://indico.cern.ch/event/441464/ ) :

PDF Version Here

1. Communications

• Dmitry Gudkov:
  • Rust Oxidation on Bearings after BWS tests: Samples sent to MME, they´ll study the issue and possible causes.
  • Optical Disk drawings (for laser treatment) sent to Dundee University, contractual issue solved.
  • New samples for laser treatment (304L and Anticorodal) with different roughness, preparation is under way.

• Raymond Veness:
  • Monday the documents of the new disk samples arrieved to Paul Collier.
  • Disk samples will arrive soon for validation with optical system.
  • New Technical student on the section, Mathew, will work on Methods for doing quality measurements on wires.

• Paolo Magagnin:
  • Visited PSB 4L1, without moving magnetic components the BWS fit well and the installation may be OK.
  • Proposal to insert BWS in section 11 without moving magnetic components.

• Bernd Dehning:
  • RF Measurements: Tank prepared for measurements

• Jose Luis Sirvent:
  • Radiation Hardness of Vacom Feedthrough already considered on design. Very short fibre optic with very few dopants, no issues with radiation at 1310nm expected.
  • New optics studied and proposed for external optical system. Required dimensions communicated to Paolo.

2. Follow-up Open Actions

3. BWS Motor: News. Dmitry Gudkov (CERN)

• Three Motor Orders placed: They´ll arrive Sept, Nov 15 and Jan 16

• Optical disk:
  • Drawings finished in collaboration with Jose and sent to company for laser treatment assessment.
  • Samples of different materials and surface finish proposed.Anticorodal (aluminium, bakeable??) and 304L (Vacuum)
  • Remark (Anticorioidal) : If exposed to the beam, large SEY.
  • Three new fixation hubs for glass optical disk ordered with 304L: 1 for proto in SPS + 2 for Lab systems.

• PSB Beam Wire Scanner mechanics Proposal:
  • Option 1 (45 degrees Flange):
    • Up to 8 BWS installed on 1 PSB section (4V & 4H)
    • Complex fabrication process and welding
    • Easier mounting/dismounting
    • Mass 26.2kg
  • Option 2 (Flat Flange):
    • Up to 4 BWS installed on 1 PSB Section (4V on 4L1 + 4H on 11L1)
    • DN250 flange used, but possibility of using a larger one to ease manipulations.
    • Usage of standard flange, possibility of using the same mechanics for SPS (to check possibility).
    • Simpler vacuum tank
    • Complex process for mounting/dismounting the device (maybe guides needed)
    • Mass 16.9kg

4. AOB

• William´s discussions with Jean-Pierre from the workshop:
  • Both designs of option 1 (one proposed by Nicolas, one by Paolo)are possible to be fabricated.
  • Option 1 requires a special welding procedure and pieces fabrication process needs to be performed.
  • For option 1 some pieces, as they are on the current design, need to be modified to be possible to fabricate.
  • Many sources of stress need to be considered with Option 1.

• Proposal of an unified design of BWS for PSB and SPS using Option 2
  • The integration of Option 2 with SPS needs to be verified (longer forks, different flange)
  • An adapter flange could be used to fit the PSB BWS version in SPS.

• Mounting/Dismounting process of PSB BWS (Option 2):
  • The different steps are complicated to perform by hand without breaking the wire or damaging the optica disk.
  • Disk should be protected, a disk "protective jacket" needs to be included on the desing.
  • Movement steps need to be guided by a rail system to ensure extraction and insertion of scanner safety.
  • Need of crate for manipulations.

• Decissions:
  • Continue investigations on Option2
  • Try with DN273 flange, check improvement on space for mounting/dismounting
  • Check an adapter flange for SPS and make an integration study of SPS forks.
  • For efficiencyonly one person will manage the design of the optical position sensor mechanics (Nicolas Chritin)

6. New Actions