X-Message-Number: 25370
Date: Tue, 21 Dec 2004 09:49:25 EST
Subject: Yvan's cryostat

Yvan Bozzonetti writes in part:

The  cryostat would be big: Something as 2 x 2 x 3 m for the inside volume 
3 x 3 x 3.5 m outside

It appears he is thinking of a rectangular cryostat with an annular space  of 
a half meter. 
For maximum thermal efficiency, he needs a cylindrical design with support  
only at the top. Some of our older cryostats are rectangular, with internal  

bracing, and were good enough, but boil-off is lower with top-support  
He also mentions epoxy. As I said earlier, we formerly used epoxy as the  

resin for the interior fiberglass, with polyester resin for the outer walls. But
our latest models use a new and better resin, information about which can be  
obtained from Andy Zawacki or our suppliers. I don't know the degree of 
allergy  hazard with this, or its mechanical characteristics in application.
Again, I am full of admiration for Yvan's bold thinking on such things as  

the brain reader, while I have no idea how practical or feasible it is. But I am
 still much concerned that he may be biting off more than he can chew, 
working  alone. 
And I really don't see the argument that a storage facility outside the US  

would make a good back-up. A mere, small pilot facility would be pretty useless
 in event of a problem maintaining facilities in the US. If the US ever had 
to be  abandoned, then a major effort would be needed somewhere else, and the 
chance is  pretty remote that there would be a 180 degree shift, from friendly 
in the US  and hostile in France. (I can't really comment on the brain reader  
Robert Ettinger

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