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From: Sven Hegewisch
Subject: Re: Home brew linear accelerator?
Date: Wed, 25 Sep 2002 10:24:57 +0200
Organization: [posted via] Leibniz-Rechenzentrum, Muenchen (Germany)
References: <3D8B60B3.1090107@BOGUS.earthlink.net> <3D8C1E99.74B9964D@earthlink.net> <3D8DC36E.516C8809@webaccess.net> <3D8EC823.7A1A0777@Physik.Uni-Muenchen.DE> <3D9033D3.992ED850@Physik.Uni-Muenchen.DE>
NNTP-Posting-Date: 25 Sep 2002 08:25:01 GMT
X-Mailer: Mozilla 4.7 [de] (WinNT; I)
George Gonzalez schrieb:
> Sorry, I see your reasoning, but IMHO it's a tad faulty:
> (1) The fact that atmospheric pressure will oxidize a getter does not tell
> us much what will happen at 0.0000000001 atmos. pressure.
> (2) One very old trick, to resuscitate a gassy tube, was to use a propane
> torch to heat the flashed area of the glass. This would sometimes do the
> trick. This would tend to indicate that cold getter material doesnt absorb
> much if any gas.
The heating produces a new surface so it can pump faster.
> (3) I too have seen power tubes with oxidized getters. It's not clear to me
> whether the getter was doing its job, or if the high glass tempeerature of a
> runaway gassy tube did the oxidation, or both.
> I'd say the evidence is inconclusive, either way.
I really dont think so.
Please see the following link:
This article is from 1950, a time when vacuum tubes where state of the art.
See especially the last table ( #III ) with the outgassing and working
temperatures of typical getters. For barium the working temperature
is 20 - 200 degrees centigrade ( Celsius ).
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