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 6, Issue 4
Displaying 1-8 of 8 articles from this issue
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  • Superconducting LINAC
    Yuzo KOJIMA
    1971 Volume 6 Issue 4 Pages 129-136
    Published: November 30, 1971
    Released on J-STAGE: February 26, 2010
    DOIhttps://doi.org/10.2221/jcsj.6.129
    JOURNAL FREE ACCESS
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    The object of this paper is to show a brief review of superconducting LINAC. Characteristics of super-LINAC, results of cavity experiments, and present status of some projects for constructing the super-LINAC are given.
    Basic parameters for design and construction are also briefly discussed.
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  • Recent Developments of Dilution Refrigeration
    Takao KODAMA, Toyoichiro SHIGI
    1971 Volume 6 Issue 4 Pages 137-145
    Published: November 30, 1971
    Released on J-STAGE: February 26, 2010
    DOIhttps://doi.org/10.2221/jcsj.6.137
    JOURNAL FREE ACCESS
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    Following the brief description of the basic principles of dilution cooling briefly, recent developments of dilution refrigeration are reviewed. In order to realize the idea of dilution refrigeration as perfectly as possible, following factors are important; to make the efficient heat exchangers which have low flow-impedance and small thermal boundary resistance, to reduce the amount of He4 in the circulating He3 and to eliminate heat input into the mixing chamber, especially vibration of the cryostat originating in mechanical pumps.
    Three types of heat exchangers-continuous or tube-in-tube heat exchanger, sintered copper heat exchanger and copper foil heat exchanger are described.
    Almost pure He3 can be circulated by use of the novel design of still which suppresses the He4 film-flow.
    The lowest temperature which has been achieved so far by the dilution refrigerator is 5.5mK in the continuous operation and 4.5mK in the singlecycle operation. This value is very close to the theoretical limiting temperature of the dilution refrigerator.
    Experiments which combine the continuous dilution refrigeration with the adiabatic demagnetization and the adiabatic compression of He3 are also presented.
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  • Operation of Cryogenic System for 75cm Hydrogen Bubble Chamber
    Hiromi HIRABAYASHI, Isao KITA, Tameyoshi TASHIRO, Junichi TAKADA
    1971 Volume 6 Issue 4 Pages 146-155
    Published: November 30, 1971
    Released on J-STAGE: February 26, 2010
    DOIhttps://doi.org/10.2221/jcsj.6.146
    JOURNAL FREE ACCESS
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    A 1kW refrigerator-liquefier for the Japanese Hydrogen Bubble Chamber was constructed and test operations with the chamber have been carried out for three times. In the first run, the refrigerator-liquefier which is Simple Linde type was confirmed that it could afford about 60 liters of liquid hydrogen per hour or the equivalent refrigerant. In the later two runs, the bubble chamber was cooled down to the liquid hydrogen temperature at the rate of less than 5°K per hour and filled up with 220 liters of liquid hydrogen. Many bubble chamber photographs were taken under the various thermodynamical conditions. An automatic bubble chamber temperature control system which regulates the direct two-phase hydrogen flow from the refrigerator-liquefier is now under testing.
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  • A.C. Losses in Superconducting Nb-Zr-Ti Wires (I)
    Shinichi ARAI, Mitsuhiro KUDO
    1971 Volume 6 Issue 4 Pages 156-162
    Published: November 30, 1971
    Released on J-STAGE: February 26, 2010
    DOIhttps://doi.org/10.2221/jcsj.6.156
    JOURNAL FREE ACCESS
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    A.c. loss measurements were made at a power frequency of 50Hz for superconducting Nb-Zr-Ti alloy wires, and for the single and multi-core composites.
    The a.c. losses of the alloy wires were found to be equal to those calculated due to the Bean-London model. The total a.c. losses of the single-core composites were calculated due to the Bean-London model for the superconducting single wire and then due to eddy-current losses for the copper matrix. The calculated value agreed well with the measured value for the single-core composites.
    The losses of the multi-core composite were nearly equal to those calculated of due to the proposed model, in which this composite was approximated to an equivalent cross-section single composite.
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  • “Cryogenics Safety Manual” of British Cryogenics Council
    M. FUKUI
    1971 Volume 6 Issue 4 Pages 163-165
    Published: November 30, 1971
    Released on J-STAGE: February 26, 2010
    DOIhttps://doi.org/10.2221/jcsj.6.163
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  • Erratum to : Helium Problems: Resource, Production and Conservation
    1971 Volume 6 Issue 4 Pages 174a
    Published: 1971
    Released on J-STAGE: February 26, 2010
    DOIhttps://doi.org/10.2221/jcsj.6.4_174a
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  • Erratum to : Pneumatic Controlled Refrigerator
    1971 Volume 6 Issue 4 Pages 174b
    Published: 1971
    Released on J-STAGE: February 26, 2010
    DOIhttps://doi.org/10.2221/jcsj.6.4_174b
    JOURNAL FREE ACCESS
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  • Erratum to : A Control Equipment for Automatic Running of A Small Helium Liquefier
    1971 Volume 6 Issue 4 Pages 174c
    Published: 1971
    Released on J-STAGE: February 26, 2010
    DOIhttps://doi.org/10.2221/jcsj.6.4_174c
    JOURNAL FREE ACCESS
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