Minutes BWS Upgrade: Electro-Mechanical Design Meeting #3 -- 7th August 2015 --

Participants: Alexander, Pirre-Jean, Paolo, Juan, Jonathan, Dimitry

Agenda (http://indico.cern.ch/event/436415/ ) :

1. Communications

2. Follow-up Open Actions

3. Update motor selection (D.Gudkov)

  • Standard motors are ordered from Alxion and Kollmorgen
  • Custom motor is ordered from Alxion
  • Design of disc mount was shown
    • Run out (wobbling) +- 50 um 70 % of light lost (given by Zemax simulations)
  • Metallic disc under construction for LASER darkening
    • Disc has thicker mounting part in the center
    • Accuracy newly defined: flatness below 20 um (corresponding to 10 % light intensity loss)

4. Test measurements (D.Gudkov)

  • 30000 test are done
  • Temperature stable after 225 minutes at 52.5 degree measured at the outside of the stator housing.
  • Next step : one week (33) more aging test
  • Question ask: what need to be done be fore end of the year
    • Proposal, if needed to make some tests in parallel

5. AOB

  • New Actions:
Action Asigned to:
Next meeting 21.08. 15:30: Electrical test result from aging test
of BWS calibration system
Follow up design of mask with alignment holes
Planning proposal for scanner tests
Section 4 PSB also to be used by SEM, consultation with Federico needed Paolo
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