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Re: CDC Gas Flow

Sounds too simple!
We would bring 1/4" plastic tubing along the outside and bring it in through the downstream Mylar bag?

Tim

Curtis A. Meyer wrote: 
Hi Elke -

My understanding of how we plan to do this is that we simply reverse the
"in" and "out" gas line somewhere outside of the chamber. I don't think
that anything else changes.

  Curtis

On Tue September 30 2008, Elke-Caroline Aschenauer wrote:
  
On Tue, 30 Sep 2008, Curtis A. Meyer wrote:

Dear Curtis,

that sounds like a very very nice idea. the only discussion point I could
see is do we increase any material in the detector by this. I would not
think so, but just to ask the obvious question.

cheers elke



    
Date: Tue, 30 Sep 2008 12:52:57 -0400
From: Curtis A. Meyer <cmeyer@ernest.phys.cmu.edu>
To: GlueX Tracking <tracking@gluex.org>
Cc: Gary Wilkin <wilkin@andrew.cmu.edu>
Subject: 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/

      
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