Minutes-5-12-2011

May 12, 2011 FDC meeting

Agenda

1. Production
   • Status and plans (Dave)
   • Wire tension scan logbook page 565 (Lubomir)
2. Engineering (Bill)
   • Tooling
   • Package assembly design
   • Other
3. Electronics (Fernando, Chris)
   • Rigid-flex stuffing
   • Other
4. Chamber testing (Beni, Lubomir)
   • Gas system at Blue Crab
   • Equipment for Blue Crab
5. Other

Minutes

Participants: Eugene, Bill, Dave, Chris, Simon, Beni, and Lubomir.

Production

- Dave: The first two cathodes are assembled waiting for the rigid flexes. Anatoly cuts the wires on the first wire plane right now. The third cathode is tensioned and the frame glued; next is to tension and glue the ground plane. Fourth cathode is ready to be tensioned. The ultrasonic cleaner is back and Al is installing it now. We will fill it with distilled water. The frame will be cleaned first with Vigon and then put in the ultrasonic cleaner. We are waiting for the tool ring needed to tension the end windows.

- Final results from the position and tension measurements of the first production chamber are shown at page 565 of the FDC logbook. We decided that we have to fix the offset in the pin position of the jig rail. From the position measurements (as explained at page 565) the pitch is short by ~130 microns. Dave measured it directly with a caliper and found ~100microns which is consistent, given the precision of the caliper. Bill will bring the pin rail to the machine shop for fixing it and will try to expedite this since it stops the wire plane production. His idea is to increase the hole sizes so that one can vary the gap, to map the positions of all the pins and thus to adjust the gap, after that to put pins to fix the position. Tension measurements were done in a half a day, the voltage on the generator was kept 1V for both field and sense wires (before we used 3V for the sense wires). We found one sense wire broken between the solder pad and the glue; it was replaced by Casey. One of the filed wires had lower tension because of its weight touching the lower plate of the weight shielding.