Minutes 4-25-2007
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FDC Weekly Meeting
Date: April 25, 2007
Participants: Daniel, Simon, Tim, Kim, Roger, Chuck
Next Meeting: Wednesday, May 2, 2007 @ 1:30 p.m.
Contents
Design Drawings
- Work continues to gather drawings for the FDC system from various folks. DSC will pass these on to Elke when everything is gathered together.
Cathode Prototyping
- Brian was away this week, so there was not much progress on work for the cathode boards and their measurements. - DSC wants to begin pursuing plans for some sort of cathode backing. This discussion will heat up over the next month or so. The plan is to try various options this summer. - Gerard reported that he could not complete measurements of the strip-to-strip capacitance on one of the dummy flex boards that he has. He found that the resistance between strips is only on the order of a few Ohms. Simon verified this with another of the boards. After some cleaning/scrubbing with acetone, the resistance went up to a few hundred Ohms. We need to contact the board manufacturer to find out why these boards are problematic. Note: for the final production boards (and those for the prototype) we will spec that the boards should be tested electrically to meet our specs. - We discussed how to attach the cathode connectors to the circuit board. The plan is to include a cutout in the cathode backing frame to allow a flex-style connect to fit in. This will be soldered to the cathode board and to the connector. Roger will begin to lay this out to ensure that we do not have any issues with space requirements. - We should plan on a two-piece board for the cathodes.
Circuit Boards
- DSC wants to push ahead on a more serious design attempt on the HVTBs and STBs. We discussed what decisions we need to make to allow Kim to move ahead. We should plan on a two-piece design for the STBs and HVTBs to give us the needed flexibility for the HV segmentation. - We are close now in terms of making decisions that will allow these designs to move ahead. We need them in the next few months so that we can complete the boards to get the wire frames to FNAL for winding this summer. - DSC would like to construct a circuit board from HVPF for the small-scale prototype for testing purposes. We would like to get Fernando's input and opinions and then proceed.
FDC CD-2 Document
- Work continues on preparing a short write-up detailing answers to the recommendations brought up during the DC review in March. Simon has prepared a first draft. We are awaiting results from MC for the cathode and wire rates, the momentum and angle resolution, and the effect of the annulus material on photon conversions.
Magnetic Field Tests
- We are pursuing a field test with our small-scale prototype in Hall B using the old pair spectrometer magnet. DSC and Simon have prepared a test plan detailing what needs to be done to set up the measurements, what measurements we would like to do, and how long the test will take. The game plan has been passed on to Elke. DSC has already talked to Volker about using the magnet. He will pass on the game plan to him after it Elke signs off on it. - The tests would take place during the summer down time after the magnet refurbishment and field mapping take place. We could have access in August/September.
Work List
- The FDC short-term work list has been posted on the FDC web site (see http://www.jlab.org/Hall-D/detector/fdc/). DSC is still waiting for feedback and comments from the group.
Minutes prepared by Daniel. Send any comments or corrections along.