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Re: CDC Gas Flow



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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