Minutes 5-9-2007
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FDC Weekly Meeting
Date: May 9, 2007
Participants: Daniel, Simon, Kim, Roger, Chuck, Tim, Fernando
Next Meeting: Wednesday, May 16, 2007 @ 1:30 p.m.
Contents
Cathode Prototyping
- DSC raised an issue with our planned carbon fiber support ring for the cathodes, namely issues associated with heating due to large current flows associated with a magnet quench. Nobody in the room had any knowledge of the issues. DSC will do some investigation by talking to Mac as they have similar issues with the planned carbon-fiber endplate for the R2 chambers for CLAS12.
New Prototype Cathodes
- The delivery of the +/-75 deg U/V cathode boards is on hold as CCT marketing (the flex board manufacturers) is having trouble making our cathode boards (with the 5 micron Cu strips) without having the low resistance problem found on the full scale dummy boards. They will be in contact with Sheldahl to see if this is a problem with the board material (although the material that CCT has in their possession is the same as they used for our other cathode boards), and they will also do some checking of their etching procedures to see if they are doing something different or wrong. - Simon was asked to follow up with CCT to talk to a technical representative (as opposed to a salesman) if he does not hear from them within a week. We do not want the delivery of these boards delayed.
Circuit Boards
- Fernando will specify the pin out for the daughter board connectors to Roger and Kim so that they can begin laying out the STBs. We are assuming that these will be two-piece boards. Roger will follow up by looking at email exchanges with Brian and then contacting the PCB manufacturer before Kim begins work. - We decided not to worry too much about daughter board connector placement for the full-scale prototype. At some point Tim and Chuck will have to layout the precise locations of the connectors to ensure that we have uniform coverage of the cables about the perimeter of the FDC system. - The LV for the daughter boards will be supplied through the STBs themselves. Fernando will find a connector to use to connect the LV lines to the STBs. - The design of the HVTBs is awaiting the rate studies from the ongoing MC effort. We are still expecting results shortly.
FDC CD-2 Document
- Work on this document to address the material issues in the active and inactive areas brought up during the drift chamber review is awaiting results from MC. More to come.
Magnetic Field Tests
- DSC turned in the FDC test plan and request to Volker. DSC will follow up with Volker and discuss the time frame for doing the work. - We are still trying to find external tracking detectors to define a track at the location of the FDC prototype. No luck digging anything up at JLab. DSC will approach IUCF about what they may have available.
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/). This is continually being updated and DSC welcomes any feedback or comments from the group.
Minutes prepared by Daniel. Send any comments or corrections along.