Minutes 9-6-2006

FDC Weekly Meeting

Date: September 6, 2006

Participants: Daniel, Brian, Simon

Next Meeting: Wednesday, September 13, 2006 @ 1:30 p.m.

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1). Brian has produced a new end view drawing of the FDC. His plan

   is next to add traces, connectors, and bolt holes to the
   individual planes.

2). Brian brought a 1-cm thick sample of Rohacell to show us. This

   material can be machined to a very high degree of flatness.  The
   Rohacell thickness between the cathode and ground planes is
   nominally 5-mm.

3). Brian told us his plan is not to mount the Rohacell to a frame.

   He believes that this is not necessary.  From Brian's conversations
   with Youri Sharabian, Rohacell is gas tight.

4). The PR for the full-scale tensioning system has finally been

   signed.

5). Brian will start work on a full-scale mock-up of the Rohacell

   sandwich.  If kapton is not available, then mylar will be used.
   The Rohacell order should arrive in ~2 weeks.

6). Brian talked to Karen Kephart of FNAL. It seems as if the wire

   winding shop will be available to ~2010.

7). Brian discussed a neat wire deadening system used by Karen.

   The wires are embedded in a copper solution to build up their
   radii to a specified level -- this kills the gain in an elegant
   manner.

8). DSC asked whether circuit boards can be made with a Rohacell

   dielectric -- Brian will look into this but the issue could
   be local flatness.

9). Brian will look into PC board manufacturers who can make 1.2 m

   circuit boards to our specs.

10). Brian will show DSC the small-scale tensioning system in the

    EEL building this week.  We need to plan on how to make a
    chamber stack.

11). Simon needs to do Monte Carlo to specify the allowable Rohacell

    and epoxy thicknesses.
  - Note that there is no need to epoxy Rohacell to the ground planes
    in the active region.  Epoxy only at external edges and possible
    the center point.
  - Cound this work for the cathode planes as well?  Some tensioning
    might be required.

12). DSC again raised the idea not to tension the cathode planes

    but to work on a flat surface instead and roll the plane
    flat.

Minutes prepared by Daniel. Send any comments or corrections along.