Hmm... wierdness - I replied a couple minutes ago, and it dissappeared - below is a recreation...
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bigben2k:
You know, that's not a bad idea. Thanks for the clarification!
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You're welcome.
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What I like about it is that it allows the slug to sit up against the block with a certain flexibility.
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Agreed, not sure if this is a good thing or not, but I don't see it as a major issue either way.
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What I don't like is that I was considering using a vacuum to insulate the slug, but I might be able to work with it.
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I don't see a problem - The WB would seal the top of the chamber, the sleeve makes the sides, and it should be simple to extend the sleeve far enough to put a sealing plate over the back end, then evacuate the entire space.
However as designed I don't know how much help the vacuum would be. Since the sleeve and the slug would be in close contact, there would still be alot of thermal conduction losses.
A minor redesign could probably handle much of this though. Obviously the sleeve would need to be made out of poor thermal conducting materials. Second get rid of most of the material touching the slug, leaving just enough to work as a guide. (Possibly a honeycomb pattern of some sort?) It should be possible to minimze the losses that way.
Gooserider