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Re: CDC Gas Flow



Hi Tim 
Actually, I think we wanted to bring the gas through some support rods inside
the chamber volume. We simply reverese the flow direction of what we are
currently planning. Then we do not break trhough the down-stream plenum
at all, and it is "easy" to seal.


     curtis
On Tue September 30 2008, Tim Whitlatch wrote:
> 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/
> >>>
> >>>       
> >>  ( `,_' )+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=
> >>   )    `\                                                  -
> >>  /    '. |                                                  +
> >>  |       `,              Elke-Caroline Aschenauer            =
> >>   \,_  `-/                                                    -
> >>   ,&&&&&V         Jefferson Lab                                +
> >>  ,&&&&&&&&:       HALL-D 12C / F381       121-A Atlantic Avenue =
> >> ,&&&&&&&&&&;      Suite 8                 Hampton, VA 23664      -
> >> |  |&&&&&&&;\     12000 Jefferson Ave                             +
> >> |  |       :_) _  Newport News, VA 23606  Tel.:  001-757-224-1216  =
> >> |  |       ;--' | Mail:  elke@jlab.org    Mobil: 001-757-256-5224   -
> >> '--'   `-.--.   |                                                    +
> >>    \_    |  |---' Tel.:  001-757-269-5352                             =
> >>      `-._\__/     Fax.:  001-757-269-6331                              -
> >>             +=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+
> >>
> >>     
> >
> >
> >
> >   
> 



-- 
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/