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FDC Weekly Meeting

Date: March 26, 2009

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

Next Meeting: April 2, 2009 @ 1:30 p.m.

Full-Scale Prototype Updates

 - Cathode Board Orders
    * Cathode boards: The PR is waiting for a budget code that Roger will
      get from Eugene. The PR will be on Eugene's desk before the end of 
      the week. The total for the order is roughly $13k.  Roger has gotten 
      some additional packing instructions from Brian (no securing tape and 
      non-static paper) that Roger will put into the order. We have been
      given an initial delivery time of 6 weeks. Roger will see what he
      can do to push this.
    * Corrosion issue: Simon compared photographs of the boards taken upon
      delivery to the latest photos and it does not seem the corrosion is
      worse now than when the boards arrive (good news). We will still pass
      our QA concerns to Allflex and they may opt to do another rinse stage.
    * Cathode daughter boards: The PR is waiting for a budget code that Roger
      will get from Eugene. The PR will be on Eugene's desk before the end
      of the week. The turn around time for the order is a couple of weeks.
      Roger will talk to Greg Arnold's group about doing the board stuffing
      as soon as the boards come in. Fernando will have a scheme for
      the addressing resistors by that time.
 - Chamber Wire:
    * We are waiting for the W&M SEM folks to finish training their folks
      on the new SEM and then they will finish our wire QA checkout. Brian 
      will prepare a final QA report with photos and test results for all 
      wires when all studies are complete.
 - Mark S. is responsible for upkeep of the list of procurements for the
   full-scale prototypes.
      * Location: M Drive/halld/Electronics, or for more sophisticated folks, 

Wire Frame Update

 - Status: Two wire frames (P4 and P1) have been wound. A third frame has
   had the wires attached but measurements of tension and wire position
   are pending. The linear transducer has been sent off for refurbishment
   and should be back and reinstalled in about 2 weeks.
 - Bill was at IUCF last week observing, documenting, and interacting with
   the IUCF team. He prepared a trip report that has been posted as:
   GlueX-doc-1229. The relevant folks should look this over and
   consider Bill's comments and recommendations. The report has been
   forwarded to IUCF as they have some blanks to fill in. At some point in
   the near future, we will have a phone meeting to go over this issues.
 - Wire combs: The wire positioning on the IUCF winding table is not as
   well controlled as it could be. We may ultimately design precision combs
   to help locate the wires. Several ideas were discussed for Phase 3
   winding, but we won't take this too far until we get closer to Phase 3.
 - Bill has been updating the wire frame construction document based on 
   lessons learned from the prototype frames. He is working to incorporate
   some more relevant photographs. A new version will be posted when his
   work is done.
 - Brian and Mark were supposed to spend some time honing the procedure
   for electroplating Cu onto the sense wires with one of the JLab
   chemists (Tom Elliott) but he has been sick this week. This work has
   been rescheduled for next Monday. All of the parts n' pieces are in
   hand. Bill will design an alignment jig and a system for attaching the
   electrical leads to the chambers.
 - The bearing for the rotatable platter for the Phase 2 soldering is in
   hand. Bill will complete the design and get the drawings to the shop

Cathode Construction

 - We reviewed the cathode R&D timeline.  The current schedule is being kept 
   on the mdrive at:
     * Location: M:\halld\Individual-Schedules\FDC or for more sophisticated 
       folks, /u/group/halld/Individual-Schedules/FDC
 - Progress updates:
     * The G10 pieces for the cathode frames are on order and are due at
       JLab this week. We will start manufacture of cathode frames when
       the order arrives.
     * From available G10 pieces, a third cathode ring was made and
       machining completed in the JLab machine shop.
     * All of the cathode boards from our first board order were tripped
       using our nice cutting facility. Photographs and notes will be
       given to Bill to include in our construction document.
     * We made up a 3 piece cathode panel with a set of our 5 micron Cu
       boards. The two seams were absolutely beautiful. During attachment
       to the transfer ring, wrinkles developed on one edge of one of the
       boards. We installed this cathode in the tensioner and Eugene
       measured the tension along one diameter that met up with the wrinkles.
       The board had a steep gradient in measured tension from 600 N/m
       on one side to 450 N/m on the other. We could not find a way to
       adjust the tensioner to remove the gradient. We will set this board
       aside as it is out of spec (i.e. it will be removed from the transfer
       ring and stored for later use, if needed).
     * The wrinkles that formed in attaching the transfer ring occurred due
       to a flaw in the process that has been corrected. Our second
       5 micron Cu board was laid up and will be attached to the transfer
       ring this week. We will then see how the tension varies across the
       board early next week in the tensioning fixture.
     * Our next cathode layup will employ a set of our 2 micron Cu boards.
     * We have 5 prototype rigid flex assemblies (cathode daughter boards)
       and 5 connectors for the preamp daughter boards. We will have Greg
       Arnold's group solder on the connectors. The boards will then be
       fitted into a local area on the cathode mechanical sandwich prototype
       to study access and space conflicts to finalize the design. This
       should be done by the end of next week.
     * Bill has been working on the cathode construction document. He will
       circulate a draft shortly.

Cathode Flatness Measuring System

 - Documentation of the system continues. See the FDC wiki page for details.

Stack Assembly Procedures

 - Bill will work to finalize the stack assembly construction document 
   that has been prepared.  This document should be in place before we get 
   too far in the construction process.
 - Bill has found some plastic threaded rods that could be used to 
   compress the stack.  We will be receiving some samples shortly and
   will carry out some loading tests.

Cooling System Tests

 - Fernando is in the process of writing up the results from his cooling 
   system studies.  Stay tuned for the GlueX note.
 - Bill has done some ANSYS modeling to better study the connector that 
   goes from the daughter board card to the cooling loop.  These will be
   added to Fernando's note.


 - 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.

Cosmic Ray Test Stand

 - We will be moving the FDC cosmic ray test stand from the Test Lab back
   to the EEL building. Beni is working on designing the room layout in
   EEL 126. The move of the cosmic ray test stand from the Test Lab does
   not need to happen in April as the planned magnet tests have been
   detailed for the time being. Still, we need to get things over to EEL
   for testing.
 - 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.
 - We would like to put together a bench test plan for the full-scale 
   prototype within the next couple of weeks. This preliminary test plan 
   will be used to provide information on what test stand fixtures to 
   support the chamber we will require. Bill can then work on the design 
   and get things prepared in the shop.  Also, we would like to layout a 
   design for the electronics before too much longer so that we can reduce 
   time from when the full-scale prototype is constructed to when we get 
   into the test plan.

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.