Spitzer Liquid He |
Spitzer Liquid He |
Oct 14 2005, 05:01 AM
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#1
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Member Group: Members Posts: 356 Joined: 12-March 05 Member No.: 190 |
How much cryogen does Spitzer have remaining in its dewar? Do they know, or are they just waiting to see a temperature rise after complete boil-off? Can't find much info on the website.
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Nov 10 2005, 10:11 AM
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#2
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Member Group: Members Posts: 356 Joined: 12-March 05 Member No.: 190 |
mmmnah same temp I think. Superfluid He at ~1.5K. Right? Perhaps the cold volume in Spitzer is just less massive than GP-B's "science package". Or maybe GP-B just has to deal with more thermal radiation from Earth since it's in LEO. In fact, yes, now that I think about it I'd be willing to bet this is the reason the He ran out so much faster on GP-B.
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