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FDC Weekly Meeting

Date: June 11, 2009

Participants: Daniel, Beni, Bill, Eugene, Brian, Simon, Mark I., Roger, Fernando, Rich

Next Meeting: June 18, 2009 @ 1:30 p.m.

General Construction Updates

 - The design drawings for the fiber-reinforced gusset rings have been
   submitted to the machine shop.
 - The pins for the assembly jig on which the detector stack will be
   constructed are now being made in the machine shop.
 - 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.
 - Cable preparations:
    * The LV cables have arrived and will be tested in the near future.
    * The parts n' pieces for the HV cables are now all in hand and
      construction and testing will begin over the next several weeks.
    * The signal cables and connectors are in hand and Mark and Brian will
      begin construction as they have time.
 - Bill has found an o-ring material that he was satisfied with and an
   order has been placed. Delivery is expected before the end of this
 - We are now having short daily meeting to review the work on the
   full-scale prototype construction and to ensure that any snags or
   problems that come up are immediately addressed.
 - Eugene is working to identify clean room space for FDC construction.
   He has talked recently with Dennis Skopik who will work to define the
   assigned space.

Wire Frame Update

 - Armen has completed nearly all of the soldering work on the four
   wire frames. In fact everything is done except for attachment of the
   high voltage pigtails (just for safety). The only snafu was that the
   locating holes for the preamp card connectors were too small and had
   to be enlarged slightly. Fernando passed this information on to Kim
   to update the design drawings.
 - Fernando's summer student Rich Rines from UMass will be performing a 
   series of HV tests on the completed wire frames to ensure that there 
   are no problems. We will start getting updates next week.
 - 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.
 - We are pushing hard to begin wire frame construction early next year and
   begin wire winding before the end of 2010. Hopefully this can all procede.
   We are now working to complete the simulation studies with Simon to
   determine if we want to offset neighboring wire layers. More to come in
   the upcoming months.
 - 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.
 - Bill is now designing the jig for the wire electroplating operation
   and it will be ready for submission to the shop at some point in the
   future. We will make a decision shortly if/when we will electroplate
   the wires for the full-scale prototype.
 - 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 laminations for the 8 cathode frames will be completed by
       tomorrow. Work to seal the exposed Rohacell edges is now underway.
     * Electrical QA on the new cathode boards has been completed.
     * Cutting of the edges of the cathode boards is now underway. One
       full board set has been trimmed. Brian expects the work to be
       completed by the end of next week.
     * A minor issue with our center cathode board panels is that there is
       a Cu dot and letters "AT" right in the middle of the central beam hole!
       This problem has been communicated to Allflex and will be rectified 
       with the final board order.
     * We are working to finalize the procedure for laying up the 3 piece
       cathode panels. It appears we have a complete plan in place and
       a final mockup will be made with two dummy boards before laying up
       panels for the prototype. At this point, one panel has been prepared
       with the newest boards but the procedures used have been slightly
     * Eugene has retensioned the 2 micron board that was made a month ago.
       He set the average tension to ~500 N/m and saw a 2% tension change
       after 1+ day. He believes it is good enough and we will attach the
       composite ring shortly. The flatness of the plane will be measured
       after the 5 micron board is scanned.
 - A portion of the rigid-flex assembly has arrived (50 each of the cathode
   boards and ground boards). The problem with the locating holes being to
   small (mentioned above for the wire frame PCBs) is present with these
   boards too. Roger will see to it that the holes are enlarged and the
   boards are passed on to Armen for soldering work.
 - Bill has been working on the cathode construction document. He has
   circulated a draft for comment. The file is located at
   /u/group/halld/Engineering/PRELIMINARY DOCUMENTS.
 - We are working to finalize the PR for the 2 micron cathode board
   material. Procurement will be negotiating with Nippon Steel Chemical
   Company to try to convince them to complete this order. Roger is also
   in discussion with the company that makes the 5 micron Cu boards about
   making the 2 micron boards. Stayed tuned for new developments.
 - 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.
 - Bill has come up with a scheme to secure the cathode boards flat up
   against the granite rock of our flatness measurement table. The work is
   nearly done and should be ready to scan the 5 micron cathode early next
 - We still have one set of the 2-micron Cu boards from the first cathode
   order to lay-up. They will be needed for the full-scale prototype.

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. He would like to have it all up and functioning
   and understood before the end of June.
 - 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
   we discussed his preliminary document briefly. He will circulate it
   for feedback and we will continue to flesh it out. We want to make sure
   that we do some checks of gas leakage with the prototype. We agreed that
   the best procedure would be to use the P5 gas mixture (non-flammable).
 - Bill has designed a system to rotate the prototype from vertical to 
   horizontal. The drawings will be submitted to the machine shop this week.
 - Safety paperwork for the cosmic ray test stand is being prepared now
   and will be submitted to Bert shortly.

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.