Cryogenic Refrigeration System.
DEPARTMENT OF THE NAVY WASHINGTON D C
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A simply constructed low input power cyclic cryogenic refrigerator suitable for cooling superconducting quantum interfering devices SQUID and similar instruments is provided. A Stirling machine having a multistage displacer and a piston as its only essential moving parts, with helium gas as the working fluid, achieves and maintains a temperature of substantially 8.5 deg K. The working cylinder and displacer are separated by a tube and are fitted together precisely at steady-state operation rather than at room temperature. The displacer preferably is made of nylon and its cylinder of an epoxy-glass composite to provide the nearly optimum clearance required to maintain the 8.5 deg K. temperature for continuous periods on the order of several weeks. Author
- Air Conditioning, Heating, Lighting and Ventilating