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: