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  1. No Access

    Chapter

    Analysis of Anomalous Resistivity in an Aluminium Stabilized Superconductor for the Large Helical Device

    The helical coils of the Large Helical Device are pool-cooled superconducting coils. The conductor consists of Nb-Ti/Cu monoliths, pure aluminium stabilizer and a copper sheath. The copper sheath is necessary ...

    S. Imagawa, N. Yanagi, T. Mito, T. Satow… in Advances in Cryogenic Engineering Material… (1994)

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    Chapter

    Structural Analysis of the Large Helical Device

    Structural analysis by finite element method has been carried out for the supporting structures of the Large Helical Device (LHD). The LHD has one pair of helical coils and three pairs of poloidal coils, all o...

    S. Imagawa, H. Hayashi, H. Tamura, A. Nishimura… in Advances in Cryogenic Engineering (1994)

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    Chapter

    Experimental Observation of Anomalous Magneto-Resistivity in 10–20 kA Class Aluminum-Stabilized Superconductors for the Large Helical Device

    Degradation of recovery current due to the unexpected enhancement of resistivity of aluminum stabilizers has been observed in pool-boiling-type superconductors that have been developed for the helical coils of...

    N. Yanagi, T. Mito, K. Takahata, M. Sakamoto… in Advances in Cryogenic Engineering Material… (1994)

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    Chapter

    Construction and Commissioning Tests of a 10 kW Class Helium Refrigerator for the Large Helical Device

    The Large Helical Device is a heliotron fusion experimental device in which magnetic fields are controlled exclusively by superconducting coils: a pair of helical coils and three pairs of poloidal coils1. The hel...

    S. Satoh, T. Mito, S. Yamada, J. Yamamoto, O. Motojima… in Advances in Cryogenic Engineering (1996)

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    Chapter

    Design and Construction of Coil Supporting Structure and Cryostat Vessel for LHD

    The Large Helical Device is a fusion experimental machine with all superconducting coils. Electromagnetic force generated by the coils is supported by the torus shaped “supporting structure” of 100 mm thick 31...

    H. Tamura, A. Nishimura, S. Imagawa, T. Satow… in Advances in Cryogenic Engineering (1998)

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    Chapter

    Completion of Helical Coils for LHD

    Helical coils of LHD are large scale pool-cooled superconducting coils. In order to produce a fine magnetic surface, the accuracy of the coil position is very important. The required tolerance for manufacturin...

    S. Imagawa, H. Tamura, A. Nishimura, T. Satow… in Advances in Cryogenic Engineering (1998)

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    Chapter

    Development of a Cryogenic System for the Large Helical Device

    The construction and the cooling schemes of the cryogenic system for the Large Helical Device (LHD) are reported. The LHD is the first fully superconducting heliotron type experimental fusion device, which is ...

    T. Mito, S. Satoh, R. Maekawa, S. Yamada, K. Takahata… in Advances in Cryogenic Engineering (1998)

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    Chapter

    Operation Characteristics of the Helium Refrigerator for the Large Helical Device with a Dummy Load Apparatus

    The helium refrigerator/liquefier operation for the Large Helical Device (LHD) with a dummy load apparatus (DLA) has been conducted under four different refrigeration conditions: no heat load mode; precooling ...

    R. Maekawa, T. Mito, S. Satoh, S. Yamada, A. Iwamoto… in Advances in Cryogenic Engineering (1998)