TEION KOGAKU (Journal of Cryogenics and Superconductivity Society of Japan)
Online ISSN : 1880-0408
Print ISSN : 0389-2441
ISSN-L : 0389-2441
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Volume 10, Issue 2
Displaying 1-5 of 5 articles from this issue
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  • Critical Temperatures of β-W type Superconductors
    Mitsuhiro KUDO, Katsuzo AIHARA, Ushio KAWABE
    1975 Volume 10 Issue 2 Pages 39-47
    Published: May 25, 1975
    Released on J-STAGE: February 26, 2010
    DOIhttps://doi.org/10.2221/jcsj.10.39
    JOURNAL FREE ACCESS
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    General aspects of β-W type compounds with high superconducting critical temperatures are given. Critical temperatures of superconducting compounds are mainly affected by factors of crystal structure, lattice constant, and stoichiometric composition.
    It is emphasized that the critical temperature of the β-W type compound is increased with the lattice constant approaching to an ideal stoichiometric value. The extrapolated plots of critical temperature and lattice constant suggest that the critical temperatures of stoichiometric compounds Nb3Ge and Nb3Si can be enhanced up to near 26K and 30K, respectively.
    Magnetic field dependence of a critical current density was also discussed about a coevaporated Nb3Ge thin film.
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  • Stability of Hollow Conductor
    The case of superconducting power transmission line
    Noriharu TAMADA
    1975 Volume 10 Issue 2 Pages 48-54
    Published: May 25, 1975
    Released on J-STAGE: February 26, 2010
    DOIhttps://doi.org/10.2221/jcsj.10.48
    JOURNAL FREE ACCESS
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    The stability of superconducting hollow conductor has been widely discussed, but almost all of them are concerned with the case of a superconducting magnet.
    In this paper, the stability condition against pulsive heat inleak is ascertained by numerical computation for a realistic power transmission line model.
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  • Kirk Cycle Cryogenic Miniature Refrigerator
    Junichiro MORIYA, Kiichiro KASAMATSU, Ichiro OOKUBO, Harumi KIHARA, No ...
    1975 Volume 10 Issue 2 Pages 55-64
    Published: May 25, 1975
    Released on J-STAGE: February 26, 2010
    DOIhttps://doi.org/10.2221/jcsj.10.55
    JOURNAL FREE ACCESS
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    This report describes the development and the reliability study of the Kirk cycle miniature refrigerator manufactured for trial. Firstly, we show the reason why the Kirk cycle is adopted for the refrigeration, and deal with the structure of cryogenic miniature refrigerator. The refrigeration power of this refrigerator is 72 watts max, at an operating temperature of 77K, and excellent characteristics are obtained in the actual COP, the specific volume and the specific weight. Secondly, we pointed out the failures of the trial Kirk cycle refrigerator. General failures may be divided into four modes; catastrophic, critical, marginal and negligible failures. We investigate the critical failures of the swash plate type driving system, and the calculated results of the reliability are given.
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  • [title in Japanese]
    [in Japanese]
    1975 Volume 10 Issue 2 Pages 65-66
    Published: May 25, 1975
    Released on J-STAGE: February 26, 2010
    DOIhttps://doi.org/10.2221/jcsj.10.65
    JOURNAL FREE ACCESS
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  • Erratum to : Helium 3 Refrigerator for Polarized Proton Target
    1975 Volume 10 Issue 2 Pages 76
    Published: 1975
    Released on J-STAGE: February 26, 2010
    DOIhttps://doi.org/10.2221/jcsj.10.2_76
    JOURNAL FREE ACCESS
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