Minutes 9-13-2006

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FDC Weekly Meeting

Date: September 13, 2006

Participants: Daniel, Brian, Simon

Next Meeting: Wednesday, October 4, 2006 @ 1:30 p.m.

Mechanical Drawings

 - Brian provided a CAD drawing for the full-scale plane
   tensioning system.  Simon can use this in the FDC report that
   he is working on.
 - Brian is continuing to work on the FDC mechanical drawings.
   Things are progressing on the layout and frame design.  We
   are still several weeks away from mature drawings.  A version
   of these will be put into the FDC report for DOE.

Ground Planes

 - We discussed the idea of using sprayed on graphite or conducting
   ink for the FDC ground planes.  Chris Cuevas has no real preference
   between these.  This approach will eliminate 24 kapton layers for
   the FDC system.  The idea is to spray this directly onto the
 - We raised the idea of using spray-on conducting ink for the cathodes
   too.  The local flatness is such that this cannot be used given
   our flatness tolerance according to Brian.
 - Brian will pursue getting a sample of conductive ink to do some

Design Issues

   Brian is planning on using a ``tensile tube" system to limit
   compression of the FDC package so that the foam layers will not
   be compressed.


   The Rohacell order has still not gone out due to delays in the
   12-GeV office.

Monte Carlo

   Simon is tuning up HDFAST to address material budget questions and
   thickness limitations for momentum resolution.
   - kapton sheets = 50 microns
   - epoxy layers  = 25 microns
   - Rohacell layers = 5 mm
      - Do calculations of dP/P vs. P, theta with and without the
        material.  We can then discuss results with Elton and

Gas System

   We briefly touched on the gas distribution system for the FDC
   system and cooling needed for the on-chamber electronics.  No
   real design or discussion yet on these two points.


   Due to the upcoming BCAL test in Hall B, we will not have our
   next FDC meeting for several weeks.

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