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Posted
25 minutes ago, Matt26LFC said:

Wonder if sub 4m would be possible with a pot designed to make use of LHe better?

I think another option to go below -200C is to use sealed ln2 container that is fed ln2 through capillary tube and vacuum this container by pump - to achieve lower boiling point with pressure drop. Z.O.T. guys did smth like that 10 years ago.

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