Kakuyūgō kenkyū
Online ISSN : 1884-9571
Print ISSN : 0451-2375
ISSN-L : 0451-2375
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Volume 56, Issue 6
Displaying 1-4 of 4 articles from this issue
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  • Thermal Barrier Formation and Axial Confinement in Tandem Mirror
    Yasuhito Kiwamoto, [in Japanese], [in Japanese], [in Japanese], [in Ja ...
    1986 Volume 56 Issue 6 Pages 369-388
    Published: December 20, 1986
    Released on J-STAGE: March 04, 2011
    DOIhttps://doi.org/10.1585/jspf1958.56.369
    JOURNAL FREE ACCESS
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    Present status of studies on axial confinement in tandem mirror is reported with an emphasis on thermal barrier physics. A brief review is made on theoretical models of potential formation at thermal barrier and plug. Results obtained in GAMMA 10 experiments at University of Tsukuba are presented for illustrating the current stage of researches on end-loss reduction in tandem mirror.
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  • First Wall and Blanket Technologies
    Haruki Madarame
    1986 Volume 56 Issue 6 Pages 389-408
    Published: December 20, 1986
    Released on J-STAGE: March 04, 2011
    DOIhttps://doi.org/10.1585/jspf1958.56.389
    JOURNAL FREE ACCESS
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    First wall and blanket technologies are discussed and recent studies on them are reviewed. First wall and blanket are major components of a fusion reactor, which have their own important functions. The aim of their design is to find out the solutions which perform the required functions under constraints from other component design. This requires not only developments in various engineering fields but also the integration of knowledge. Further efforts are needed before we get a viable design of first wall and blanket for fusion power reactors.
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  • Numerical Simulation on Volume Production of Negative Ions in Hydrogen Plasmas (II)
    Dependence of H- Production on Plasma Parameters
    Osamu Fukumasa, Setsuo Saeki
    1986 Volume 56 Issue 6 Pages 409-426
    Published: December 20, 1986
    Released on J-STAGE: August 16, 2011
    DOIhttps://doi.org/10.1585/jspf1958.56.409
    JOURNAL FREE ACCESS
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    Dependence of H- production on plasma parameters (i. e. electron density ne, electron temperature Te and hydrogen gas pressure p) is studied by using a set of particle balance equations in a steady state hydrogen plasma. The model includes six species of vibrationally excited hydrogen molecules H2* (vibrational level v″=5-10) which are important for H- production. Particular attention has also been paid to wall effects on H- production. So, both the wall recombination coefficient γ1 for H and the wall de-excitation collision parameter γ2 for H2* (v″) are treated as numerical parameters.
    With increasing Te, H- yield decreases. Both ne and p have some optimum values for H- production. The most significant point is that ion species ratios depend strongly not only on plasma parameters but also on wall parameters, i. e. γ1 and γ2. For H- production, the optimum condition is that γ1≅1 and γ2<<1.
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  • Effects of the Location of the X-Point on Edge Confinement
    Tihiro Ohkawa
    1986 Volume 56 Issue 6 Pages 427-428
    Published: December 20, 1986
    Released on J-STAGE: March 04, 2011
    DOIhttps://doi.org/10.1585/jspf1958.56.427
    JOURNAL FREE ACCESS
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    The collisionality of ions near the separatrix of the diverted tokamak depends on the location of the x-points. The divertor configuration with the x-point on the median plane on the outboard side should behave like a limiter configuration.
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