RE: Fun with TEM guts

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Fun with TEM guts

in science •  5 years ago 

What's all that gunk in the middle of the hole in the second picture?

science
5 years ago by

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      ·  5 years ago 

    Leftover Indium Seal, which I later removed.

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      1 vote
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        ·  5 years ago 

      On that note, why do they use indium seals to begin with, rather than usual copper gaskets for high vacuum?

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          ·  5 years ago 

        I think that because the liner tube is pretty thin, because the bore through the lenses is pretty small. The pressure required to make a copper seal would cause the liner tube to buckle.

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