Minutes 9-6-2006

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FDC Weekly Meeting

Date: September 6, 2006

Participants: Daniel, Brian, Simon

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

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.


 - 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.


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

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.

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

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.

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.

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

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