Minutes-4-22-2010
April 22, 2010 FDC meeting
Contents
Tentative Agenda
- Production
- UVA wire stringing equipment (Brian): pin rail2, pin rail, pos meas cam, pos meas , pos meas parts, pretension screw, string table
- off-site production space planning
- Updates on:
- Electronics: PCB, cable procurement status (Fernando)
- Cathode redesign (Roger)
- FDC cabling (Bill)
- Full-scale prototype
- status (Lubomir)
- grounding problems (Fernando)
- cosmics tests (Beni)
- Other
Minutes
Participants: Bill, Roger, Brian, Glenn, Chuck, Mark, Simon, Beni, Eugene, Lubomir
Production
- Brian reported on his visit at UVA. The parts at UVA, two pin rails (~2m each) and the parts of the position measurement system, are in good condition and can be used. Brian thinks that the stringing of the FDC at JLab using the UVA procedure/equipment is doable; the number of the wires is not that big to require winding machine. Brian and Bill discussed some possible improvements related to the way the pin rails are attached to the table/ strongback, the way the weights are attached to the wires. There were discussions about the precision of the stepper motor for the position measurements.
- not only UVA agreed to lend us the equipment, but as Prof. Nilanga Liyanage (before UVE he worked for Hall A) proposed, they want to join the Hall D collaboration and work on the FDC (great news!). As part of their contribution, Nilanga proposed to send us a student for this summer. We are discussing now the possible tasks for him.
- Glenn suggested to organize a meeting with Rusty to formulate our requirements about the off-site space. Bill already made a floor plan and estimated some general parameters that were needed to plan the infrastructure there.
Updates on:
- Electronics: the PCBs are finalized; Kim sent out the PCB specifications to three vendors. Fernando submitted the PR for the cables.
- Cathode redesign: Roger had several questions related to the ground of the cathode daughter board (flex) design, and also the strip labels.
- Bill explained the proposed design of the cable bundles and the installation procedure. Still, we have to decide about the total number of cables and get accurate info about their sizes. This includes 528 (+ 24/48spare?) signal cables, 264 thin low voltage cables, 8 HV cables, 4 grounding cables, 48 gas pipes, 8? cooling lines. We are considering also to do some prototype cable bundles to make sure it works. Expect more discussion on the next meeting.
Full scale prototype
-
- Casey made 55 fixes on the wires of the top (third) layer; 5 wires were not reparable (without replacing them). Beni did HV tests on this layer: one sector doesn't hold the nominal HV, the other sectors can be used in the tests, especially the two side sectors, showing very low noise.
- Chamber preparations for the cosmics test continue. Mark mounted the holding brackets. Before installing the chamber at the test set-up tomorrow (Friday) morning, we will do one more test inside the tent: for leakage when the chamber is lifted and hold only on the brackets.
Other
- Eugene wanted to have the latest floor plan and required parameters for the off-site space. He also wanted to make sure we have a task for the UVA student this summer.
