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 58, Issue 4
Displaying 1-7 of 7 articles from this issue
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Preface
Award of Cryogenics and Superconductivity Society of Japan
Feature: Research and development of A15 superconducting wires (2)
Focused Review
  • Superconducting Characteristics of Nb3Sn Cables Stranded with Ultra-fine Wires
    Xudong WANG, Kiyosumi TSUCHIYA, Akio TERASHIMA, Yasuo IIJIMA, Akihiro ...
    2023 Volume 58 Issue 4 Pages 196-200
    Published: July 20, 2023
    Released on J-STAGE: July 20, 2023
    DOIhttps://doi.org/10.2221/jcsj.58.196
    JOURNAL FREE ACCESS
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    We are developing A15 cables made of ultra-fine wires for react-and-wind （R&W） magnet technology. Recently, we fabricated a bronze processed multifilament Nb3Sn wire with a diameter of 50 µm. We also made a prototype Nb3Sn cable by stranding 19 wires for testing. In this study, the transport critical current（Ic） of the cable was measured at 4.2 K and under an external field up to 18 T. The Non-Cu critical current density（Jc） was also calculated from the Ic results. For the Ic measurements, the cable was wound on glass fiber reinforced plastic（GFRP） cylinder bobbins after the heat treatment in straight geometry to replicate the R&W process. Four GFRP bobbins with different diameters were prepared to investigate the bending limit of the cable. The critical temperature（Tc） and magnetization properties of the cable were also measured by a magnetic property measurement system of Quantum Design.

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Originals
  • Regeneration of Hydrogen Adsorbent used in Helium Recovery System
    Masato NAKAMURA, Tomoyuki DANTSUKA, Hiroki OKUNO
    2023 Volume 58 Issue 4 Pages 201-208
    Published: July 20, 2023
    Released on J-STAGE: July 20, 2023
    DOIhttps://doi.org/10.2221/jcsj.58.201
    JOURNAL FREE ACCESS
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    In recent years, liquid-helium supply and recovery systems have shown serious problems with hydrogen impurities in the system. To remove hydrogen impurities, we developed a hydrogen removal apparatus and installed our system. In this apparatus, silver-zeolite “Ag400” was used as the hydrogen adsorbent. Previously, Ag400 could not be regenerated after hydrogen absorption. However, we have found a new regeneration method for Ag400. In this paper, we report this regeneration method and consider the regeneration mechanism.

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