A parasitic magnetic refrigerator for cooling superconducting magnet

Author

Nakagome, H. ; Takahashi, M. ; Ogiwara, H.

Author_Institution

Toshiba Res. & Dev. Center, Kawasaki, Japan

Volume

24

Issue

2

fYear

1988

fDate

3/1/1988 12:00:00 AM

Firstpage

1113

Lastpage

1116

Abstract

Experimental results are presented for a practical magnetic refrigerator equipped with a large-field racetrack superconducting magnet, an auxiliary GM (Gifford-McMahon) refrigerator, and a liquid-helium vessel for magnetic refrigeration cooling. In this design the magnetic refrigerator is equipped with 14 pieces of GGG (gadolinium-gallium-garnet) single-crystal material on a rotating disk that operates along the gradient of the magnetic field produced by the racetrack superconducting magnet. The heat generated by the magnetic refrigerator is removed by an auxiliary GM refrigerator through the heat absorber made of a high-thermal-conductivity metal. The cold station of the magnetic refrigerator can be connected to the liquid-helium vessel by a high-thermal-conductivity rod to recondense the gaseous helium in the vessel. Refrigeration power measurements are presented and discussed.

Keywords

magnetic cooling; refrigeration; superconducting magnets; GdGG single crystal; GdGa5O12; auxiliary Gifford McMahon refrigerator; cold station; heat absorber; high-thermal-conductivity metal; large-field racetrack superconducting magnet; liquid He vessel; parasitic magnetic refrigerator; refrigeration power; rotating disk; superconducting magnet cooling; Cooling; Demagnetization; Heat pumps; Helium; Magnetic fields; Magnetic liquids; Magnetic shielding; Refrigeration; Superconducting magnets; Temperature;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.11425

Filename

11425