Minutes-7-16-2009

FDC Weekly Meeting

Date: July 16, 2009

Participants: Daniel, Rich, Simon, Bill, Beni, Brian, Tom, Fernando

Next Meeting: July 23, 2009 @ 1:30 p.m.

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Announcement

 - Tom Carstens has agreed to take the position of Hall D work coordinator.
   He will begin this position toward the end of summer. Tom joined us
   today for the meeting.

General Construction Updates

 - The parts for the assembly jig on which the detector stack will be
   constructed are being worked on by Mark S., and he will put them
   together and do some test fits as he has time.
 - Bill will take on the preparation for a stack assembly document. A
   draft will be prepared before assembly of the full-scale prototype and
   then fleshed out during the process with relevant photographs taken.
 - We touched on an open question regarding the signal cables, namely, how
   much of the outer jacket and braid will be stripped off the signal cables.
   Some simulation work needs to happen. Fernando and Beni will talk to
   the BCAL folks.
 - Brian and Mark S. have started to make the composite frames for the two
   gas windows. The Rohacell annuli have been laid up. Vacuum bagging of
   the G10 skins will proceed next.
 - Mark S. prepared the PO for the cables that will be used to attach to 
   the cathodes for the external ground. He will also order the sealing 
   epoxy that is used to cover the conducting epoxy. No update on this
   order.

Wire Frame Update

 - Mark S. cobbled together a microscope needed for the repair work on
   the wire frames. Brian made all repairs on the second frame and all
   QA checks are complete. Brian will work to clean the boards, with
   attention paid to remove the sizeable solder resin contaminant. Fernando
   will oversee the procedures. After this work is completed, Brian will
   move to the next frame and start repairs.
 - We need to have a dedicated meeting to design what the schedule for
   work on the Phase 3 wire winding will be. The highest priority for
   work scheduling will be doing work on upgrades of the wire winding
   facility. This includes a better strongback design, the design and
   construction of precision combs, modification to the wire winding
   table, and a list of other items with the system. Stay tuned, more
   to come.
 - The wire frame construction document is located at:
   /u/group/halld/Engineering/PRELIMINARY DOCUMENTS. We will include
   the information on the wire electroplating process shortly.
 - The parts of the jig to use for the wire electroplating operation
   are in our hands. They will be assembled as we find time.
 - Brian received the SEM scans for our wire from the W&M folks. He will
   generate a final QA report with photos and test results for all wires
   in the next several weeks.

Cathode Update

 - Progress updates:
     * The edge sealing and gas hole inclusion has been completed on all
       but one of our cathode frames. The last board will be completed
       this week.
     * Mark S. completed the tensioning of another two cathode boards since
       our last meeting. One board is in the clean room that needs to be
       attached to a tranfer ring. Another board is in the tensioning
       system now.
     * It was discovered that the cathode in the tensioning system now was
       laid up incorrectly with the center board rotated by 180 deg. Bill
       believes that we can simply modify on of our frames and solve this
       issue. He will do some checking in the CAD model to ensure that there
       are no clearance issues.
     * One of our completed cathode boards is really contaminated with
       epoxy near the two seams. We are actively pursing options to try to
       remove this. More to come.
     * No sooner did we finally get the cathodes boards until environmental
       control than we ran out of nitrogen. More has been ordered.
     * We have a bit of a back up doing the flatness scans of the completed
       cathodes. DSC talked to David Lawrence to find out where we are at
       and he will get the status from Micah. Hopefully we can get this
       work completed.
 - The Fast Electronics group is handling the soldering of the rigid-flex
   assemblies. As they started to get into the work, they found that we
   did not have all the necessary components. They were ordered and should
   be in hand. However, this has caused a delay in expected delivery. We
   should have a small number in hand within two week for Mark S. to practice
   soldering them to the cathode with the epoxy on the front.
 - Bill has been working on the cathode construction document building in
   the pictures that are being taken. The current draft of the document 
   is located at /u/group/halld/Engineering/PRELIMINARY DOCUMENTS. 
 - We are standing by waiting for information on the PR for the 2-um board
   material.
 - Roger needs to prepare a document for QA/stuffing/cleaning for the
   cathode boards and a similar document for the cathode daughter
   boards and ground boards.

Cooling System Tests

 - Fernando is in the process of writing up the results from his cooling 
   system studies.  Stay tuned for the GlueX note. He indicated that he
   is back to work on this document and it should be done shortly.

Cosmic Ray Test Stand

 - Beni is continuing work to setup the cosmic ray telescope and test
   system in EEL 126. Another DAQ computer bit the dust. Are we surprised?
   (If you have been paying attention, the answer is no.). Beni is dealing
   with this. The gas tubing is in hand and will be laid out shortly.
 - We still have some mysterious behavior with the small-scale prototype
   response with wiggles in the X vs. Y distributions that need to be
   understood. We decided to have a separate meeting to discuss what work
   we would like to do on the small-scale prototype.
 - Beni has started a bench test plan for the full-scale prototype and
   is presently working on it after incorporating feedback. It was also
   suggested to send it to Curtis for feedback. He will post it as a 
   GlueX-note shortly.
 - The machined parts for the support/rotation of the full-scale prototype
   in the cosmic ray stand have been delivered. We are awaiting some purchased
   parts to arrive. After we have everything in hand, it will be assembled
   and test fitted.

Work List

 - The FDC short-term work list has been posted on the FDC web site.  
   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.