Mass spectrometers etc - test-drb@ccmp.vtda.org

16 Sep 2010

On , 15 Sep 2010 20:30:26 +0100 (BST), ard at p850ug1.demon.co.uk (Tony
Duell) wrote:

...
 Subject: Re: Mass spectrometers etc
To: cctalk at classiccmp.org
Message-ID: <m1Ovxgb-000J4BC at p850ug1>
Content-Type: text/plain

   You need to find a diffussion pump. These will
get you down to 

The French guy used a rotary vane pump and a molecular pump, which you
could probably make yourself at home (he did). The rotary vane pump
shouldn't give you any problems, and for the molecular pump you only
need an old motor capable of 24000 rpm without breaking up, and some
careful machining :-)
A spot of high vacuum grease, a few seals etc and you are all set. The
finished set up isn't particularly large either. No oil in the
molecular pump either...

/Jonas

...
 Indeed I do (My father spoet most of his working days
on high vacuum
systems., I think I'd head ofa 'diff pump' before I even went to school...

OIl, from choice. Mercury vapour, even inside a vacuum system (and some
will, alas, end up in the backing rotary pump) is not something I
particualrly keen on....

There is the minor problem of 'where the heck do I set up a vacuum
system, along with all the other things I am working on' :-)

-tony