著者

本島 修

出版者

CRYOGENICS AND SUPERCONDUCTIVITY SOCIETY OF JAPAN

雑誌

低温工学 (ISSN:03892441)

巻号頁・発行日

vol.32, no.11, pp.540-547, 1997-11-25 (Released:2010-02-26)

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The Large Helical Device (LHD) is a heliotron-type toroidal fusion experimental device which will provide useful and reliable datasets for high-temperature helical plasmas with an equivalent Q value of 0.1 to 0.35. One of the crucial tasks of LHD is to demonstrate steady-state operations by taking the advantage of its magnetic configuration with currentless plasmas as well as built-in divertors. In this respect, the coil systems are fully superconducting (SC); consisting of a pair of helical coils, three pairs of poloidal coils and nine bus lines. All the SC coils have been successfully fabricated with high accuracy and they are presently in the final stage of assembly in a cryostat vessel along with outside preparations of plasma heating devices, diagnostic equipment and control systems. The first plasma operation is scheduled for the end of March 1998. The technological development of SC magnets through this project played a key role in LHD, and will also be useful for constructing future fusion reactors.

著者

岡村 哲至 塩田 進 椛島 成治 真田 芳直

出版者

CRYOGENICS AND SUPERCONDUCTIVITY SOCIETY OF JAPAN

雑誌

低温工学 (ISSN:03892441)

巻号頁・発行日

vol.20, no.6, pp.325-331, 1985-12-25 (Released:2010-02-26)

参考文献数

4

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Design of a superconducting magnet to be coupled with a disk MHD generator in the closed cycle MHD experimental facility FUJI-1 is described. The superconducting magnet consists of two separated windings whose shape is of the circular Helmholtz type. A new structure between the windings has been proposed which supports magnetic force induced between the two windings and, at the same time, minimizes the heat leakage to the windings.

著者

三井 清人

出版者

CRYOGENICS AND SUPERCONDUCTIVITY SOCIETY OF JAPAN

雑誌

低温工学 (ISSN:03892441)

巻号頁・発行日

vol.10, no.3, pp.104-109, 1975-07-15 (Released:2010-02-26)

参考文献数

9

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State of the art of the thermocouples and resistance thermometers for cryogenic temperatures is briefly reviewed: materials for cryogenic thermocouples and resistance thermometers, examples of their characteristics, related industrial standards and reference tables, recent development to be noticed, and comments on the practice of application, installation, calibration etc.

著者

花田 卓爾

出版者

CRYOGENICS AND SUPERCONDUCTIVITY SOCIETY OF JAPAN

雑誌

低温工学 (ISSN:03892441)

巻号頁・発行日

vol.15, no.2, pp.128-140, 1980-05-25 (Released:2010-02-26)

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On September, 1978, Hydrogen Liquefaction Unit was established with a new plan to distribute customers by an industrial larger scale more than ever the way it had been applied. By this inovation caused in hydrogen distribution system, new chance was developed for the people who have not any knowladge and experience on the use of the liquid hydrogen.Accordingly, it is naturally requested to master the way of Liquid Hydrogen Safety Handring. This point will be guidance for people, operater and designer to easy handling the liquid hydrogen in the future.

著者

三木 孝史 斉藤 一功 林 征治 梶川 弘 嶋田 雅生 小川 陸郎 川手 剛雄 池谷 大 木村 則幸 高畠 和男 西澤 節 杉浦 伸裕 鈴木 基文

出版者

CRYOGENICS AND SUPERCONDUCTIVITY SOCIETY OF JAPAN

雑誌

低温工学 (ISSN:03892441)

巻号頁・発行日

vol.31, no.5, pp.258-266, 1996-05-25 (Released:2010-02-26)

参考文献数

14

被引用文献数

1 4

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So far, the use of superconducting magnets has been limited to chemical analysis and medical inspection. To develop a new use, we have tried to apply common MRI devices as nondestructive sugar content detector of watermelon. To estimate the sugar content, a new technique using multiple regression analysis of two NMR relaxation times was developed. It was found that the coefficient of multiple regression at the center of the watermelon exceeded 0.9 and the standard error of prediction was around 0.5, and that the over-ripened part of flesh called ‘nieka’ in watermelon could be distinguished because its T2 was much longer than that of the oridinary part. An evaluation rate of sugar content could be below 6s per watermelon. It is concluded that multiple analysis of T1 and T2 on intact watermelon can be applied as a non-invasive, nondestructive indicator of sugar content.

著者

井上 廉

出版者

CRYOGENICS AND SUPERCONDUCTIVITY SOCIETY OF JAPAN

雑誌

低温工学 (ISSN:03892441)

巻号頁・発行日

vol.30, no.8, pp.369-376, 1995

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The hybrid magnet, which is a large system composed of an inner water-cooled magnet and an outer superconducting magnet, is well known to be the most suitable for generating steady high-magnetic fields. Thirty T-class hybrid magnets are being operated at several high-magnetic field laboratories, The world's highest steady field at present is 35.2T. Projects to enhance the steady fields up to 40-45T are progressing now at the National Research Institute for Metal, Japan, and the National High Magnetic Field Laboratory, USA. In particular, the NRIM project is just now nearing the final stage. In this article, I review in detail the hybrid magnet technology including those of superconducting magnet and water-cooled magnet, the present status of hybrid magnet systems in operation, and the developing projects at NRIM.