A dual refrigerator assembly for cryogen-free superconducting magnet applications

Author

Herd, K.G. ; Laskaris, Evangelos T. ; Thompson, P.S.

Author_Institution

Corp. Res. & Dev., Gen. Electr. Co., Schenectady, NY, USA

Volume

5

Issue

2

fYear

1995

fDate

6/1/1995 12:00:00 AM

Firstpage

185

Lastpage

188

Abstract

Reliable refrigeration is critical to the viability of cryogen-free superconducting magnets. The servicing of a refrigerator coldhead must not interrupt the magnet operation. A dual refrigerator coldhead assembly is described in this paper which enables the disconnection of a coldhead for servicing while a second coldhead provides continuous cooling. The two-stage Balzers UCH-130 coldheads are thermally connected to the cryostat thermal shield at the first stage and to the superconducting magnet at the second stage. The assembly includes high-T/sub c/ superconducting current leads heat stationed between the first and second stages of the coldheads in order to minimize the heat leak to the magnet. Vibration isolation components minimize the transmission of the coldhead vibration to the magnet and the thermal shield. This paper describes the design, fabrication, and testing of the dual refrigerator assembly.<>

Keywords

cooling; cryostats; refrigeration; refrigerators; superconducting magnets; cryogen-free superconducting magnet applications; cryostat thermal shield; design; dual refrigerator assembly; fabrication; heat leak minimisation; high-T/sub c/ superconducting current leads; refrigerator coldhead servicing; testing; two-stage Balzers UCH-130 coldheads; vibration isolation components; Assembly; Cooling; Fasteners; Flanges; High temperature superconductors; Impedance; Magnetic separation; Magnetic shielding; Refrigeration; Superconducting magnets;

fLanguage

English

Journal_Title

Applied Superconductivity, IEEE Transactions on

Publisher

ieee

ISSN

1051-8223

Type

jour

DOI

10.1109/77.402521

Filename

402521