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FDC Weekly Meeting

Date: March 12, 2009

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

Next Meeting: March 19, 2009 @ 1:30 p.m.

Full-Scale Prototype Updates

 - Cathode Board Orders
    * Cathode boards: Roger is waiting for price estimates from Allflex, but
      the redesign work is done. The PR will move forward when the quotes
      come in. A couple of issues were discussed. Bill had asked for a
      reference line be included on the board after the last strip to help
      with the edge cutting. He wanted the gap between the last strip and
      the reference to be double checked in the model. Fernando has not
      gotten the board files for final check out. As we have been cutting
      the cathode board edges on our first order, several areas on the
      boards showed the copper was eaten away. Mark will take photos and
      pass them along to Roger for discussion with Allflex. Perhaps a flaw
      in their cleaning process?
    * Cathode daughter board: The board is design is done and checked. Roger
      is waiting for a quote before sending the PR to Eugene. DSC asked for
      60 cathode daughter boards and 6 cathode ground boards to be ordered.
 - Chamber Wire:
    * Brian talked to the SEM folks and they will complete their tests when
      the new SEM is configured in the next few weeks.  Brian will prepare
      a final QA report with photos and test results for all wires when all 
      studies are complete.
 - Mark S. is also responsible for upkeep of the list of procurements for
   the full-scale prototypes.
      * Location: M Drive/halld/Electronics, or for more sophisticated folks, 
 - A second tension fixture ring has been completed and now in our possession.
   This should help to reduce bottlenecks.

Wire Frame Update

 - Status: We have now received data from the tension and position
   measurements. Things are fairly reasonable, and we are, for the most
   part satisfied. There are some systematics trends of both the wire
   tension and position near one end of the plane and IUCF is now looking 
   into this. We are planning for a teleconference tomorrow afternoon. The
   wire gluing on frame 2 will be done today and the soldering will be
   done tomorrow. The frame will be measured next week after the table is 
   wound for frames 3 and 4.
 - Bill will be at IUCF all of next week to document all procedures and
   to look at engineering solutions to improve the tension and position
   measurement accuracy. This may be a start to taking ownership of the
   IUCF wire winding facility at some point in the future.
 - Bill has designed a wire frame protective cover that will be in place 
   during the Phase 2 component stuffing. It needs to be test fitted onto 
   our existing wire frame to be sure all is good in the world. Bill has
   also gather parts 'n pieces for a turntable for the solder technicians 
   to use with the wire frame for this task.
 - 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.
 - We plan on performing the electroplating technique with at least a couple
   of our full-scale prototype wire planes. We will do some more practice on
   the Phase 1 winding planes to finalize the technique and to prepare a 
   procedures document. A positioning jig will be put together to allow for
   precision positioning of the deadened region and its size.  We will plan on
   doing optical scans of the plated region to be sure the plated region is
   very smooth and well defined. However, nothing has happened on this front
   during the past week.

Cathode Construction

 - We reviewed the cathode R&D timeline. Folks are reminded to pass on
   progress updates to Chuck every Wednesday.  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:
     * Cathode sandwich prototype work: The mechanical prototype is now
       complete and we are satisified with its mechanical strength. When
       the frame is lifted, it warps into a potato chip shape on a scale
       of about 4 to 6 inches. When it is set on a flat surface, it relaxes 
       back into a flat shape over a time scale of several seconds. We believe
       that we have a complete cathode design that will work for the FDC
       system. On to cathode frame construction for the full-scale
     * We will use Roger's sample cathode daughter boards with the mechanical
       cathode sandwich prototype to study the clearance and space between
       neighboring cathodes. This will happen next week.
     * Bill has designed another laminate to attach to the first and last 
       cathode frames that the gas bags will attach to. Even though the first 
       and last cathodes in a package will not be attached to another cathode 
       (thus forming a sandwich), they should still be plenty stiff.
     * Bill has been working on the cathode construction document. He will
       circulate a draft shortly.
     * The order for additional G10 pieces for the cathode frames has just
       gone out. It will be about 2 to 3 weeks until they arrive. We have 
       enough material to make 2 more cathode frames. We will have to get 
       Eugene to negotiate to get these through the shop.
     * Edge cutter update: Cuts on the 5 micron Cu board side panels have
       been completed and we are fully satisfied. We ran into a problem
       cutting the center panels that we are working on now before continuing.
       As we develop a work around, we have started to cut the 2 micron
       side boards. All board cutting from our first cathode order should be
       done by Monday or Tuesday of next week. 
     * After the board cutting, Brian and Mark will start to lay up the
       cathode panels. It might be that we can make the panels and then
       roll them up and put them into the storage box.
     * We discussed what we want to make next in terms of the cathodes. It
       was decided to make a "real" 5 micron Cu cathode board next. We will
       then move to make our 2 micron Cu boards.
     * The pieces to hold the cathode frames flat should be ready this
       week. We will use them with our first "real" cathode board and finalize
       the procedures.

Cathode flatness measuring system

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

Stack Assembly Procedures

 - We 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. This move should be probably take place in April.
 - We still have some mysterious behavior with the small-scale prototype
   response with wiggles in the X vs. Y distributions that need to be
 - 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.
 - Beni will work out a space plan for EEL 126 to make sure that we have
   room to move in our test stand and get it set up and working before
   we need it for the full-scale prototype. Eugene will talk about the
   EEL 126 space needs through this summer with Dennis.

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.