[3dem] Re: 3dem Digest, Vol 49, Issue 6

[DocDave50 at aol.com]

Peter,
 
While I don't have  specific experience with the Edwards Turbo Station, I 
do have experience  with the Gatan Pumping Station and a Pumping Station I'd 
built while at Yale  which has a rotary pump drafted Turbo.  In my system, a 
vacuum of 10e-7  Torr can be achieved in 30 minutes where the Gatan Pumping 
Station yields, at  best, 0.5e-6 Torr over a 24 hour pumping cycle.  The 
advantage of the Turbo  Pumping stations...I believe that the Edwards are 
usually 'drafted' turbo  systems...is a much faster dewar turn-around and given 
the higher vacuums being  pulled, I have found much greater holder stability 
over much longer times  of sample viewing.  If there is any relationship 
between the Edward  vacuum pumping systems in their Evaporator Systems, I know 
these can also  be run with liquid nitrogen cooling which provides yet 
deeper vacuum  conditions.  I don't know if my experience is unique but it says  
something very positive about the higher level turbo pumping systems in  
facilitating better holder stability over time.
 
David W. Chester, Ph.D.
Department of Biochemistry
Center for Structural  Biology
Flowers Building
Imperial College of  England
Exhibition Road
South Kensington, London, UK.   SW7  2AZ
_d.chester at Imperial.ac.uk_ (mailto:d.chester at Imperial.ac.uk)  
 
 
In a message dated 9/12/2011 3:00:05 P.M. Eastern Daylight Time,  
3dem-request at ncmir.ucsd.edu writes:

Dear  3DEM-ers,

Does anyone have experience with evacuating a (Gatan)  cryo-holder with an 
Edwards Turbo station (TS75D) ?

vriendelijke  groeten,

Peter
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