Minutes BWS Upgrade: Electro-Mechanical Design Meeting #6 -- 10th October 2015 --

Participants: Raymond Veness, Bernd Dehning, William Andreazza, Jonathan Emery, Aleksander Cudny, Emiliano Piselli

Agenda ( http://indico.cern.ch/event/448877/)

PDF Version Here

1. BWS PSB Motor: News (D.Gudkov)

• Showed new motor system assembly
  • Step chamber proposal: Adapt break to diameter of motor.
  • Discussion about the possibility of suppresion of one of the diameters of the stepped chamber (1 long section instead of 2 short with different diametres).
• Changes introduced:
  • External focusing system with optical viewport
  • Flange changed from DN250 to DN273 (mm)
  • Feedthrough at the motor side introduced
• Question from William:
  • Value of the absolute alignment accuracy of the tank?
    • Agreement on 300um (Bernd)
• Remark from Jonathan:
  • Electrical characteristics of the new motors need to be verified (Kt & Ke value)

2. First SPS Measurements: Planning (J.Emery)

• All the equipment in the tunnel is installed
• Acquisition system under test
• New wire scanner installation on first week of November, Week 45.

3. Optical Position Sensor: Test with the new disk samples (J.L. Sirvent)

• New disk diameter 185 mm (Before it was 135 mm)
• Materials: Titanium & Anticorodal
• Materials reflectivities are similar to glass enconder systems.
• Surface roughness must be improved to have suitable signals.
• Extintion ratio is similar to the glass disks.
• Disadvantadges of metal disk:
  • Larger inertia (is is under question. Inertia of steel disk 3e-4, aluminium disk 1e-4, glass disk 2e-4 x m2)
  • Probably higher manufacturing costs.
• Advantadges of metal disk:
  • Higher temperature limit, baking.
  • Conductive
  • Less fragile

4. AOB (B.Dehning)

• Presentation of sketch of the wire mounting on fork.
• Kick Off considerations for the design of the mounting elements.

5. New Actions