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FDC Weekly Meeting

Date: July 2, 2009

Participants: Daniel, Roger, Mark S., Simon, Bill, Beni, Brian,

Next Meeting: July 9, 2009 @ 1:30 p.m.

General Construction Updates

 - The parts for the assembly jig on which the detector stack will be
   constructed are in our possession. Mark S. and Brian will assemble the
   jig when they have time and do some test fits.
 - 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.
    * We still need to decide how much of the outer jacket and braid will 
      be stripped off the signal cables.
 - We are having short daily meetings to review the work on the full-scale 
   prototype construction and to ensure that any snags or problems that 
   come up are immediately addressed.
 - Brian and Mark S. will begin making up the composite frames for the
   two gas windows. They should be ready within a couple of weeks.
 - 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.
 - We discussed some proposed modifications to the cathode tensioning 
   facility that Bill would like. Actually he wants to make up a completely
   new fixture. We will revisit this at the next meeting after Bill does
   some more planning, cost estimates, etc. Also, we wanted to have Eugene
   present before we get too far.

Wire Frame Update

 - The wire frame P1 that had 30+ unsoldered wires last week was fully
   repaired and tested and put back into the storage box.  We then moved
   to inspect frame P2. It also had 30+ unsoldered wires. Repair work
   will proceed on Monday once we get the microscope back from the Fast
   Electronics Group.
 - 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:
     * Mark S. has completed edge sealing and gas hole inclusion and sealing
       in 4 of the 8 cathode frames. He is working on this as he has time.
     * Cathode construction progress:
        - All 7 cathode panels (2 5-um Cu and 5 2-um Cu) have been prepared.
        - 2 cathodes (1 5-um Cu and 1 2-um Cu) have been tensioned and
          laminated to their laminate rings.
        - 1 cathode (2-um Cu) is in the tensioning facility now and the
          lamination is in progress.
        - 1 cathode (5-um Cu) has been attached to the second transfer
          ring and is awaiting tension and lamination early next week.
        - 3 completed cathode panels are hanging in the clean tent.
     * Each cathode constructed this far has some sort of problem or
       non-ideal feature. Mark S. is keeping track of these in our log.
       One of our 7 cathode panels (a 2-um Cu) has a significant amount of
       epoxy +/-5 inches about each panel seam and most likely will not be
       usable. We are looking into way to try to remove the epoxy, but it
       will take some chemistry. We shall see. 
     * It is clear that we are still fine tuning our cathode construction
       process. This week we did develop a PVC pipe system to enable cathode
       boards to be flipped over from back to front with minimal risk of
       wrinkling. It has been tested and works nicely.
     * We have a plan in place to get the completed cathode boards back under
       environmental control. Hopefully this will happen next week (but of
       course I said this last week and the week before ...).
     * Eugene has passed on his knowledge of how to tension a cathode board
       to Mark S., who will tension the next cathode.
     * To finish the flatness scans of our 5 micron board, Micah has
       completed a flatness scan of the granite table surface. We are
       awaiting results. We then want to move to scan each of the other
 - Roger will follow up with Fernando next week to find out about the
   soldering work on the rigid-flex assemblies. DSC is worried about a
   real bottleneck that is appearing. We need soldering on the cathodes
   shortly too.
 - The current draft of the cathode construction document being worked on
   by Bill is located at /u/group/halld/Engineering/PRELIMINARY DOCUMENTS. 
   As new pictures are taken, they are being incorporated. As procedures 
   are modified or fine tuned, the document is being updated.
 - We completed the PR for the production quantity of the cathode board
   material with a company in Japan. They have discontinued this board
   stock and we are awaiting word if they will be able to fill this order.
   Roger talked to the company that provided the board stock for our 5-um
   Cu boards and they have indicated that they can make 2-um Cu board 
   material. They will be a backup if the Japanese company does not come
 - 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. Progress has been slow but steady with getting CODA
   and the DAQ working. There is still much to do, but things are coming
 - 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).
 - 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.
 - Safety paperwork for the cosmic ray test stand has been turned in for
   signatures, but the process is slow. Upon approval we will fill the 
   chambers with gas and be able to turn on the high voltages

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.