Minutes-5-5-2011

May 5, 2011 FDC meeting

Agenda

1. Production
   • Status (Dave)
   • Wire position scanning logbook page 564 (Lubomir)
   • End window material (Bill)
2. Electronics (Fernando, Chris)
   • Status
   • Rigid-flex stuffing
3. Engineering status (Bill)
4. Chamber testing (Beni)
   • Equipment needed for Blue Crab
   • Pressure measurements
5. Other

Minutes

Participants: Eugene, Bill, Dave, Roger, Beni, and Lubomir.

Production

- Dave: Two cathode frames type 3 (with ground planes with holes) are assembled waiting for the rigid-flexes and ground wires to be glued on them. One wire frame was strung, the wires glued and now being soldered. Expect to be ready by the end of the day, then we will do position and tension measurements. We started also cutting foils for the third cathode plane and the second wire frame is also ready.

- We discussed the configuration needed to test the first chamber: end window, cathode type 3, wire plane, cathode type 3, end window, plus empty frames to make the same thickness as of the full package. We will use the plastic gussets. Bill wanted first to do gas leakage tests with these plastic gussets, but actually such test was done before.

- End window material. Bill found two options: 1mil available now, and 2mil roll for ~$1500 total that we can have in ~2 weeks. For the first two end windows we decided to use the 1mil material.

- Wire position measurements. We had problems finding the field wire positions: the laser sensor doesn't see about 20% of them while sees all the sense wires. Possible explanations: vibrations due to HVAC on the top of the clean room; one can actually see the weights vibrating. It could be also the surface of the field wires is somehow different in reflecting the laser beam. Before for the test wire frame all the field wires were seen by the sensor, but we used different type of field wires. Two samples of our field wires will be analyzed with electron microscope by Olga.