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). Mechanical Drawings:

   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). Rohacell:

 - 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.
 - 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.

3). Paperwork:

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

4). Mechanical Mockup of Cathode Sandwich:

   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.

5). Wire Winding:

 - Brian talked to Karen Kephart of FNAL. It seems as if the wire
   winding shop will be available to ~2010.
 - 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.

6). Design Discussion:

 - DSC asked whether circuit boards can be made with a Rohacell
   dielectric -- Brian will look into this but the issue could
   be local flatness.
 - Brian will look into PC board manufacturers who can make 1.2 m
   circuit boards to our specs.
 - 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.

7). Monte Carlo:

 - 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.
 - Could this work for the cathode planes as well?  Some tensioning
   might be required.

8). Cathode Sandwich Discussion:

   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.