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Erschienen in:
1986 | OriginalPaper | Buchkapitel
Cold Assembly of Leak Tight Demountable Joints
verfasst von : G. L. Mills, R. F. Arentz, M. H. Johnson
Erschienen in: Advances in Cryogenic Engineering
Verlag: Springer US
Enthalten in: Professional Book Archive
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Preliminary designs for the NASA/Stanford GP-B Relativity Gryoscope Experiment indicate the desirability of having a capability for assembling and disassembling connections at 4 K which are leak tight to superfluid helium. A series of experiments were performed to prove that this is feasible. Three flanges were tested: a 6.4 cm diameter ConFlat flange, a 7.6 cm diameter indium sealed flange and a 25.4 cm diameter indium sealed flange. The 6.9 cm diameter and 7.6 cm diameter flanges were bolted together while submerged in liquid helium and leak checked while the helium bath temperature was lowered below the λ point. The 25.4 cm diameter flange was bolted together and leak checked at 76 K. All three flanges were leak tight, after being assembled, to a level of less than 4 × 10−7 standard cm3/s.