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CDC Gas Flow

Hi Everyone -

  after our connector discussion today, I got to thinking about 
the gas flow through the CDC, and leaks. For reasons which
I do not believe we ever really justified, we always talked about
flowing the gas in the upstream end of the chamber, and out
the down stream end. This choice requires good seals around 
all the wire feed throughs.

   I started wondering why we do not reverse the flow direction.
The down stream plenum is extremely easy to gas tight (nothing
comes through it), and if we take the gas out of the upstream
plenum, a small leak there is probably  not a disaster.

   We should follow up on this, in particular does anyone have
a good reason why this can't work?

  thanks - Curtis
-- 
Professor Curtis A. Meyer        Department of Physics
Phone:  (412) 268-2745          Carnegie Mellon University
Fax:    (412) 681-0648            Pittsburgh PA 15213-3890
cmeyer@ernest.phys.cmu.edu  http://www.curtismeyer.com/