Cryocooler having low magnetic signature

Details Cryocooler having low magnetic signature Cryocooler having low magnetic signature

1983-11-18

1986-08-19

Capossela, Ronald C.

Refrigeration

Gas compression, heat regeneration and expansion, e.g.,...

60520, F25B 900

Patent

active

046061940

ABSTRACT:
A cryocooler 8 is described which has a low magnetic signature in which a ceramic displacer 10 reciprocates within a helium impenetrable cold finger cylinder 12. A cyrogenic refrigerator formed by the displacer and the cold finger cylinder cools a cold space 22 to cryogenic temperature. The cold space 22 is magnetically shielded from a drive motor 18 which both drives the displacer 10 and compressor pistons 14, 15, 16. The motor is magnetically shielded by means of magnetic shields 70, 72, 74, 90, 76, 78, 80, 82.

REFERENCES:
patent: 4143520 (1979-03-01), Zimmerman
patent: 4281517 (1981-08-01), Zimmerman et al.
patent: 4365982 (1982-12-01), Durenec
Sullivan and Zimmerman, 1979 IPC Business Press Ltd, vol 2, No. 6, Nov. 1979, "Very Low-Power Stirling Cryocoolers Using Plastic and Composite Materials".
Zimmerman et al., "Possible Cryocoolers for SQUID Magnetometers", SQUID Superconducting Quantum Interference Devices and Their Applications, 1976.
Zimmerman et al., "Referigeration for Small Superconducting Devices", 1976.
Zimmerman et al., "Operation of a SQUID in a Very Low-Power Cryocooler", Conference on Applications of Closed-Cycle Cryocoolers to Small Superconducting Devices, 1978.
Pirtle, F. William, CTI-Cryogenics Report, Nov. 1980, "Closed Cycle Cryocooler for Low Temperature Electronic Circuits", AD AD93416.
M.mu. Shield Company Brochure, "M.mu. Shield Magnetic Shields", 1978.

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