Low heat-leak cryogenic envelope

Details Low heat-leak cryogenic envelope Low heat-leak cryogenic envelope

1975-04-18

1976-10-19

Wayner, William E.

Refrigeration

Low pressure cold trap process and apparatus

138127, 174 15S, 285 47, 285DIG5, F17C 702

Patent

active

039863417

ABSTRACT:
A plurality of cryogenic envelope sections are joined together to form a power transmission line. Each of the sections is comprised of inner and outer tubes having multilayer metalized plastic spirally wrapped within a vacuum chamber formed between the inner and outer tubes. A refrigeration tube traverses the vacuum chamber, but exits one section and enters another through thermal standoffs for reducing heat-leak from the outer tube to the refrigeration tube. The refrigeration tube passes through a spirally wrapped shield within each section's vacuum chamber in a manner so that the refrigeration tube is in close thermal contact with the shield, but is nevertheless slideable with respect thereto.

REFERENCES:
patent: 3265236 (1966-08-01), Gibbon et al.
patent: 3698200 (1972-10-01), Johnson et al.

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