Kakuyūgō kenkyū
Online ISSN : 1884-9571
Print ISSN : 0451-2375
ISSN-L : 0451-2375
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Volume 64, Issue 3
Displaying 1-5 of 5 articles from this issue
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  • Divertor Plasma in a Tokamak
    Tomonori Takizuka
    1990 Volume 64 Issue 3 Pages 255-280
    Published: September 20, 1990
    Released on J-STAGE: October 22, 2010
    DOIhttps://doi.org/10.1585/jspf1958.64.255
    JOURNAL FREE ACCESS
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    A poloidal divertor system is available for the thermonuclear fusion experimental tokamak reactor from the viewpoint of power and particle control. Divertor plasma models are reviewed briefly, which are used for analyzing divertor functions and for computer simulations. Simple results of one-dimensional analysis parallel to magnetic field lines are given, which show the qualitative characteristics of divertor plasma and rough values of divertor-plasma parameters. In relation to the boundary condition at the divertor plate, sheath conditions are especially noted in the appendix. Experimental results of density and temperature profiles in divertor plasmas as well as the width of heat flux are reviewed. Results of impurity shielding experiments and He ash exhaust experiments are also described shortly. Comment on the completion of divertor-plasma database is attached finally.
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  • Performance of Candidate Plasma Facing Materials against Thermal Shock
    Masahiro Seki
    1990 Volume 64 Issue 3 Pages 281-290
    Published: September 20, 1990
    Released on J-STAGE: October 22, 2010
    DOIhttps://doi.org/10.1585/jspf1958.64.281
    JOURNAL FREE ACCESS
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    Plasma facing materials are subjected to intense heat load in both normal and off-normal operations. Carbon based materials especially carbon fiber composites with high thermal conductivity are employed as the plasma facing material in next step machines like ITER. Design analysis on ITER divertor plates shows that thermal shock erosion of carbon based materials limits life-time of the divertor, leading to extensive experimental studies to investigate the erosion due to intense thermal shock at disruptions. The present paper outlooks the recent results on laboratory experiments on the thermal shock erosion of both carbon materials and metals.
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  • Spin-Polarized Fuel in ICF Pellets
    Yoshihisa Wakuta, Nobuya Emoto, Hideki Nakashima, Yasuyuki Nakao, Taku ...
    1990 Volume 64 Issue 3 Pages 291-304
    Published: September 20, 1990
    Released on J-STAGE: October 22, 2010
    DOIhttps://doi.org/10.1585/jspf1958.64.291
    JOURNAL FREE ACCESS
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    The use of parallel spin-polarized DT or D3He fuel increases the fusion cross-section by 50%. By implosion-burn simulation for inertially confined fusion (ICF) pellets of the spin-polarized fuels, we found that the input energy requirement could be reduced by nearly a fact of two. These pellets taken up here include large-high-aspect-ratio DT target proposed in ILE Osaka University and DT ignitor/D3He fuel pellet proposed by our group. We also found that the polarized state could survive during the implosion-burn phase.
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  • Thermal Dike Concept for Plasma Confinement
    Tihiro Ohkawa
    1990 Volume 64 Issue 3 Pages 305-314
    Published: September 20, 1990
    Released on J-STAGE: October 22, 2010
    DOIhttps://doi.org/10.1585/jspf1958.64.305
    JOURNAL FREE ACCESS
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    The concept of a thermal dike for the reduction of electron heat loss parallel to the magnetic field from magnetically confined plasma to the material wall or divertor plates is discussed. The ponderomotive pressure of the rf field or the combination of the magnetic mirror and rf heating pushes the cold plasma towards the divertor plate. The influx of cold electrons is prevented by a thermal dike and the parallel heat loss which takes the form of exchange between hot and cold electrons in the long mean free path regime is reduced
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  • Operational Experience and Improvement of Klystrons for the JT-60 LHRF Heating System
    Kenji Yokokura, Masayuki Sawahata, Minoru Sato, Makoto Kusaka, Kenji F ...
    1990 Volume 64 Issue 3 Pages 315-326
    Published: September 20, 1990
    Released on J-STAGE: October 22, 2010
    DOIhttps://doi.org/10.1585/jspf1958.64.315
    JOURNAL FREE ACCESS
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    Operational experience and improvement of klystrons for the JT-60 LHRF heating system are reported. JT-60 klystron is the most powerful and wide band one forfusion plasma heating. Operational experience of these klystrons were accumulated after encountering many troubles to be removed and the stable operation is performed to repair the electron gun in the klystron. These are reported acompanying the data in detail.
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