プラズマ・核融合学会誌
Print ISSN : 0918-7928
78 巻, 12 号
選択された号の論文の15件中1~15を表示しています
Rapid Communications
解説
小特集 「核融合炉内外におけるトリチウムの回収技術」
研究論文
  • Masao OKAMOTO, Noriyoshi NAKAJIMA, Shinsuke SATAKE, Weixing WANG
    2002 年 78 巻 12 号 p. 1344-1351
    発行日: 2002年
    公開日: 2006/03/31
    ジャーナル フリー
    Neoclassical radial electric fields are calculated in a tokamak plasma with a flow by using a δf Monte Carlo particle simulation code “FORTEC-S” . The calculations are restricted to the plasma with a constant temperature. The distribution function related to the given flow is treated as a perturbation to the background Maxwellian distribution function in the simulation. The time development of the radial electric field is analyzed by a simple model and the average radial electric field is estimated in the long time limit. It is shown that the δf simulation results are well in agreement with those of the analytical estimation.
  • Masaaki INUTAKE, Akira ANDO, Kunihiko HATTORI, Hiroyuki TOBARI, Tsuyos ...
    2002 年 78 巻 12 号 p. 1352-1360
    発行日: 2002年
    公開日: 2006/03/31
    ジャーナル フリー
    A high-density and high-speed flowing helium-plasma is produced quasi-steadily (1 ms) by use of a magneto-plasma-dynamic arcjet (MPDA) in various external magnetic field configurations. In a uniform magnetic field configuration, an ion acoustic Mach number Mi of the plasma flow is limited to be nearly unity. In a divergent magnetic nozzle configuration, on the other hand, the Mach number increases up to almost 3. The Mach number increases in proportion to the gradient of the magnetic field. Spatial variations of Mi are well predicted by an isentropic model of compressible flow. The Mach number decreases in the downstream region due to charge-exchange collisional processes that are caused by a limited pumping capability of surface-recombined neutral gases.
  • Kensaku KAMIYA, Haruyuki KIMURA, Hiroaki OGAWA, Hisato KAWASHIMA, Kazu ...
    2002 年 78 巻 12 号 p. 1361-1367
    発行日: 2002年
    公開日: 2006/03/31
    ジャーナル フリー
    In the JFT-2M tokamak, discharges exhibiting good performance have been produced by counter-NBI after boronization. An improved core confinement mode under an H-mode edge condition is sustained for ˜5 τE with H89P˜1.5 and β N˜2.0 at a line-averaged electron density of around 70% - 80% of the Greenwald density limit. It is found that the q-profile changes from a monotonic one having q0˜1 to a zero or weak negative central magnetic shear configuration having 1 < qmin ≤ q0 < 3 during improved core confinement mode using counter-NBI under an H-mode edge condition. The central electron temperature very clearly increases when the sawtooth activity disappears, while the previous result without boronization exhibited a significant degradation of the energy confinement due to the accumulation of impurities. The mechanism governing the improved core confinement mode including the density peaking and/or ITB formation due to negative shear is presently unclear.
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