Behavior of a 4K-GM Cryocooler in a Magnetic Field

The behavior of a 4K-GM (Gifford-McMahon) cryocooler in a magnetic field has been investigated. Characteristics of the magnetic regenerator materials were researched. The specific heat of ErNi0.9Co0.1, ferromagnetic regenerator material decreased under a magnetic field of 1T, while that of HoCu2, an...

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Published inTEION KOGAKU (Journal of Cryogenics and Superconductivity Society of Japan) Vol. 34; no. 5; pp. 196 - 199
Main Authors ONISHI, Atsushi, SATOH, Toshimi, HASEBE, Tsuginori, WATAZAWA, Keiichi, SAKURABA, Junji, ADACHI, Yoshiya, UMEHARA, Izuru, SATO, Kiyoo
Format Journal Article
LanguageEnglish
Published CRYOGENICS AND SUPERCONDUCTIVITY SOCIETY OF JAPAN 1999
Subjects
cooling capacity
Gifford-McMahon cryocooler
regenerator material
specific heat
superconducting magnet
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Summary:The behavior of a 4K-GM (Gifford-McMahon) cryocooler in a magnetic field has been investigated. Characteristics of the magnetic regenerator materials were researched. The specific heat of ErNi0.9Co0.1, ferromagnetic regenerator material decreased under a magnetic field of 1T, while that of HoCu2, an antiferromagnetic regenerator material, had little effect of the field. The SRDK-408BW 4K-GM cryocooler, made by Sumitomo Heavy Industries, Ltd., was installed in a cryocooler-cooled superconducting magnet. The cryocooler was operated in a magnetic field under 1T. The cryocooler with ErNi0.9Co0.1 rose to its reachable temperature after increasing the magnetic field. In contrast to ErNi0.9Co0.1, the cryocooler with HoCu2 has a constant cooling capacity under 1T.
ISSN:0389-2441
1880-0408
DOI:10.2221/jcsj.34.196