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

Responsible Action Status
Dmitry Contact Jose for second disk type, dimensions of holes Design Complete
MME analysis of bearing and bearing seat Samples sent for analysis
Paolo Space reservation Space available (4L1 & 1L11)
Jose Radiation hardness feed through and optical system investigations Feedthrough OK. New optics proposed
William Early next week estimate if RF measurements could be next week, closing flanges needed on work
Bernd wire holdings on work
make a test planning for both setups, proto II and test bench on work

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

Responsable Action
Jose Order new Viewport and Lenses for external optics system validation
Prepare Next meeting (17 or 18 th Sept 2015)
Nicolas Include protection mechanics for disk
Deeper study on Option 2 for easier mounting / unmounting (bigger flange)
Check Integration with SPS, adapter flange, longer forks...
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Topic revision: r3 - 2015-09-08 - unknown
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