Kakuyūgō kenkyū
Online ISSN : 1884-9571
Print ISSN : 0451-2375
ISSN-L : 0451-2375
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Volume 63, Issue 5
Displaying 1-6 of 6 articles from this issue
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  • Major Results From JT-60 Experiments
    Nobuyuki Hosogane, Ryuji Yoshino
    1990 Volume 63 Issue 5 Pages 311-331
    Published: May 20, 1990
    Released on J-STAGE: March 04, 2011
    DOIhttps://doi.org/10.1585/jspf1958.63.311
    JOURNAL FREE ACCESS
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    Studies on plasma confinement, steady-state tokamak operations and boundary plasmas are main subjects in tokamaks relating to fusion plasmas. Emphases of recent JT-60 experiments from 1987 to the shutdown in October, 1989 were put on these studies. Investigations of L-mode improved modes such as pellet injection, high Ti mode, giant sawtooth by 3rd harmonics of ICRF etc., and H-mode were carried out as confinement studies. Current drive by LHCD made a large progress by using a new launcher. Bootstrap current reached 80% of plasma current, which has brought a new idea of steady-state tokamaks. Results on particle confinement, particle and heat control studies with divertor are also presented
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  • [title in Japanese]
    [in Japanese]
    1990 Volume 63 Issue 5 Pages 332-333
    Published: May 20, 1990
    Released on J-STAGE: March 04, 2011
    DOIhttps://doi.org/10.1585/jspf1958.63.332
    JOURNAL FREE ACCESS
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  • MHD Instabilities in Heliotron/Torsatron
    Masahiro Wakatani, Yuji Nakamura, Katsuji Ichiguchi
    1990 Volume 63 Issue 5 Pages 334-355
    Published: May 20, 1990
    Released on J-STAGE: March 04, 2011
    DOIhttps://doi.org/10.1585/jspf1958.63.334
    JOURNAL FREE ACCESS
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    Recent theoretical results of MHD instabilities in Heliotron/Torsatron are reviewed. By comparing the results with experimental data in Heliotron E, Heliotron DR and ATF, it is pointed out that resistive interchange modes are the most crucial instabilities, since the magnetic hill occupies a substantial region of plasma column.
    Development of three-dimensional MHD equilibrium codes has made a significant progress. By using the local stability criterions shown by DI (ideal MHD mode) and DR (resistive MHD mode) for the equilibria given by the three-dimensional codes such as BETA and VMEC, stability thresholds for the low n ideal modes or the low n resistive modes are estimated, where n is a toroidal mode number.
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  • Improved Modes and the Evaluation of Confinement Improvement
    Sanae-I. Itoh, Hikosuke Maeda, Yukitoshi Miura
    1990 Volume 63 Issue 5 Pages 356-379
    Published: May 20, 1990
    Released on J-STAGE: March 04, 2011
    DOIhttps://doi.org/10.1585/jspf1958.63.356
    JOURNAL FREE ACCESS
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    Various improved confinement modes in tokamak are surveyed and their characteristics are reviewed. To search for the potentiality as a fusion core plasma in reactor, an examination to evaluate the core performance has been made. The fusion product near the ignition condition, where Q is large, is used for the evaluation. The dilution of the fuel ion and the profile effect are simultaneously examined together with the obtained τE.
    Because of the fuel dilution and of the bulk radiation, the good performance does not always correspond to the mode with long r E. If their time evolution is taken into account the problem becomes more serious. Further extensive research to control the fuel purity is surely needed to ensure the long pulse operation.
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  • Characterizations of Graphites as Fusion First Wall Material
    Toshiro Yamashina, Tomoaki Hino
    1990 Volume 63 Issue 5 Pages 385-396
    Published: May 20, 1990
    Released on J-STAGE: March 04, 2011
    DOIhttps://doi.org/10.1585/jspf1958.63.385
    JOURNAL FREE ACCESS
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    Graphite materials have been widely used for the first wall components of fusion devices as a high heat flux and stable-material to plasmas. By using graphite first wall, the radiation loss from the plasma can be largely suppressed. However, the graphite material with high thermal shock resistance and with low erosion rate has to be developed since the heat load and the duration become extremely large in a next ignition device. In addition, the recycling due to the graphite wall has to be suppressed for the plasma confinement time to be lengthened. We here discuss the overall properties of graphites and then suggest several requirements for graphite first wall.
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  • Comment on Double Exponential Formula
    Tsuguhiro Watanabe
    1990 Volume 63 Issue 5 Pages 397-411
    Published: May 20, 1990
    Released on J-STAGE: March 04, 2011
    DOIhttps://doi.org/10.1585/jspf1958.63.397
    JOURNAL FREE ACCESS
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    A new method and its computer program for the double exponential formula for numerical integration is presented. The present method avoids underflow encountered in the computation of weights of the formula and sums the integral up to a sufficiently large number of terms, so that it does not deteriorate the accuracy of the double exponential formula even for integrands with strong end-point singularity.
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