[Sneap] thermomechanical leak

[Walter Augustyniak]

Art,
    Having that pumpout port is a great idea. We didn't install any valves 
until
a few years ago, after learning of the advantage from Oak Ridge NL. Our
TM problems sure diminished since then.
    However, we are very wary of the hi pressure (360 psi) tank gas 
permeating thru
the many O rings in a typical conical valve resulting in contamination of 
the source gas
in the bottles. So, we do not use these valves in gases that are not used
frequently, i.e. 3He, Ne. Since the permeation is so invasive, the yield
of these ions diminishes rapidly with time (like 2 - 3 months).

    Cheers,

    Walt Augustyniak
        Vanderbilt Univ

----- Original Message ----- 
From: "Arthur Haberl" <ahaberl at albany.edu>
To: "Symposium ofNortheastern Accelerator Personnel" <sneap at tunl.duke.edu>
Sent: Monday, December 04, 2006 9:33 AM
Subject: Re: [Sneap] thermomechanical leak


> The SNEAP 2005 Meeting was held at Brookhaven National Laboratory.  Please 
> visit the meeting Homepage at: https://www.bnl.gov/sneap2005/default.asp
>
> The ATF-SNEAP 2006 web site is now available:
> http://www.ansto.gov.au/nugeo/conference/private/ATF_SNEAP.htm
>
> ++++++++++++++++++++++++++++++++++++
> We have long used Potentials, Inc thermomechanical leaks in our 
> accelerator (12 gas bottles) and have a pumpout port on each line between 
> the bottle and the valve, thus avoiding having to run the valve hot for a 
> long cleanup cycle.
>
>    Art Haberl
>
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