Kakuyūgō kenkyū
Online ISSN : 1884-9571
Print ISSN : 0451-2375
ISSN-L : 0451-2375
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Volume 54, Issue 5
Displaying 1-5 of 5 articles from this issue
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  • Environmental Behavior of Tritium
    Masanobu Sakanoue
    1985 Volume 54 Issue 5 Pages 498-511
    Published: November 20, 1985
    Released on J-STAGE: March 04, 2011
    DOIhttps://doi.org/10.1585/jspf1958.54.498
    JOURNAL FREE ACCESS
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    Various studies about the behavior of tritium in the environment are reviewed with comments on several origins of their occurances. For atmospheric tritium, different chemical species and their seasonal variation have been studied. The average tritium concentration in river waters was found to be 1.5-2 times higher than that of precipitations at various sites of Japan.
    The vertical distribution of tritium in ground water has raised an interest for the samples collected from different wells in depth. The effect of the accidental release of tritium and the tritium level around nuclear facilities are also mentioned.
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  • Simulation of the Plasma Waves
    Hirotada Abe
    1985 Volume 54 Issue 5 Pages 512-531
    Published: November 20, 1985
    Released on J-STAGE: March 04, 2011
    DOIhttps://doi.org/10.1585/jspf1958.54.512
    JOURNAL FREE ACCESS
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    The present status and the introductory computational method on the particle simulation of the plasma waves are presented. The traveling waves in the bounded systems are focused. The basic idea on the physical and mathematical models used is introduced. Two examples are explained as results, which predict the experimental results. A prospect on this type of the simulation is discussed.
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  • Maximum Entropy Signal-Image Analysis and its Applications to Plasma Diagnostics
    Naofumi Iwama, Seiji Jinno, Hitoshi Takami, Takashige Tsukishima
    1985 Volume 54 Issue 5 Pages 532-553
    Published: November 20, 1985
    Released on J-STAGE: March 04, 2011
    DOIhttps://doi.org/10.1585/jspf1958.54.532
    JOURNAL FREE ACCESS
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    The maximum entropy signal-image analysis is summarized with the emphasis of the maximum entropy principle. Shannon-Burg's maximum entropy theory in data processing is a formal extension of Boltzman-Planck's theory. Under a constraint relating the unknown spectrum or image to the data, the minimization of Kullback-Leibler mean information with a uniform prior probability yields a mathematical model of spectrum or image having no physical basis. The statistical techniques of model adaptation lead to practically important advantages. Examples are shown on the spectral measurement and the image reconstruction, which have been successfully applied to the controlled nuclear fusion research.
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  • Ampere-order DC Ion Source
    Hitoshi Nihei, Junji Morikawa, Shinichi Ishida, Nobuyuki Inoue, Kanji ...
    1985 Volume 54 Issue 5 Pages 554-566
    Published: November 20, 1985
    Released on J-STAGE: March 04, 2011
    DOIhttps://doi.org/10.1585/jspf1958.54.554
    JOURNAL FREE ACCESS
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    A hydrogen ion beam of 1.1 A, 35 keV was extracted for 1 hour from a modified duo PIGatron ion source. The extraction grids and the plasma source were cooled effectively and the ion source was operated stably. When the arc plasma current was controlled by the feedback signal from the accel current, the sufficiently stable ion beam was extracted from 2 msec to 1 hour after the ignition of arc plasma. The stabilities of the ion beam power and the divergence angle were both less than ± 0.5%.
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  • Ignition Conditions of Ohmically Heated DT TOKAMAK Reactors Operated in the Ultra-Low-q, Regime
    Yutaka Kamada, Shinichi Ishida, Zensho Yoshida, Nobuyuki Inoue
    1985 Volume 54 Issue 5 Pages 567-586
    Published: November 20, 1985
    Released on J-STAGE: March 04, 2011
    DOIhttps://doi.org/10.1585/jspf1958.54.567
    JOURNAL FREE ACCESS
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    This paper studies the energy-balance characteristics of an ultra low-q (ULQ) confinement concept, and shows the possibility of the Ohmic-Heating ignition. The ULQ equilibrium considered here has the safety factor q in the intermediate range 0< q< 1 lying between tokamaks (1<q) and reversed-field pinches (q< 0 in a peripheral region). Our calculation of the energy balance is based on the experimental observation in the REPUTE-1 experiments, however, assumes a lot to consider the reactor-parameter regime. The aim of this paper is to provide a reasonable direction of researches on engineering bases. Our basic findings are as follows. There is a possibility of the Ohmic-Heating ignition for a compact and high-power density ULQ system with minor radius s 1 m, major radius ≤s 4 m, toroidal field= 8-10 T, and the total wall loading 12.5 MW/m2. To ignite ULQ plasma, temporal control of the plasma density in the start-up phase is important, and Zeff should be greater than 2 to increase the net input power.
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