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
Responsible |
Action |
Bernd |
Accuracy needed for absolute positioning |
Dmitri |
Check feedthrough maximal extension, limit for PSB. |
Make break rotate-able by xxx degree |
Come up with the range of angular movement for the break |
William |
Check that disks could be exchanged in YETS 2015/16 SPS, waiting for Christoph |
Topic revision: r2 - 2015-11-13
- unknown