<RESEARCH REPORT>CONFINEMENT, ADDITIONAL HEATING (NBI, LHH, ECH) AND CURRENT DRIVE OF STELLARATOR PLASMA IN JIPP T-II

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概要

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• The confinement of ohmically heated stellarator plasma is studied experimentally. The energy confinement time τ_E increases with total rotational transform angle ℩_Σ in the case of ℩_Σ/2π<0.25,that is q_Σ(a)>4,while τ_E decreases with ℩_Σ for ℩_Σ/2π>0.3,that is q_Σ(a)<3-4,which is consistent with the Alcator scaling. When the rotational transform angle due to helical field ℩_h/2π is larger than 0.14,no major disruptions are observed even for q_Σ(a) as low as 1.7 (℩_h/2π=0.14,I_p≳100kA at B_t=2.2T), although strong MHD oscillations with low frequency (∿1kHz) appear when q_Σ(a)<2. Tangential injections of neutral beams are carried out for additional heating of stellarator and tokamak plasmas. With co-injection, the increase in ion temperature ΔT_i at the center per injected power P_N into the torus is 1.6 eV/kW in the stellarator and is 1.9 eV/kW in the tokamak configuration. In the case of counter-injection, ΔT_i/P_N is 1.6 eV/kW in both configurations. Lower hybrid heating with the frequency of 0.8 GHz is applied. In both cases of stellarator and tokamak, ion heating of 0.8 eV/kW is observed with input power up to 160-180 kW. Electron cyclotron heating by use of klystrons with frequency of 35.5 GHz is carried out. Preliminary results show heating of bulk electrons with the heating efficiency of 1.6 eV/kW. Current drive in stellarator plasma by lower hybrid wave is observed in the case of low density plasma (n_e ∿ 5×10^<12>cm^<-3>). The efficiency of current drive is ∿0.3kA/kW at the power level of 40kW.

• 核融合科学研究所の論文

著者

• KAWAMOTO T.

  Research Information Center, Institute of Plasma Physics, Nagoya University

• Kawamoto T.

  Research Information Center Institute Of Plasma Physics Nagoya University

• Kaneko O.

  Research Information Center, Institute of Plasma Physics, Nagoya University

• Oka Y.

  Research Information Center, Institute of Plasma Physics, Nagoya University

• Kuroda T.

  Research Information Center, Institute of Plasma Physics, Nagoya University

• Tanaka S.

  Biol. Lab. Nippon Med. Schl.

• Sato K.

  Research Information Center Institute Of Plasma Physics Nagoya University

• Itoh S.

  Research Institute For Applied Mechanics Kyushu University

• Kawahata K.

  Research Information Center Institute Of Plasma Physics Nagoya University

• FUJITA J.

  Research Information Center, Institute of Plasma Physics, Nagoya University

• KADOTA K.

  Research Information Center, Institute of Plasma Physics, Nagoya University

• KAWASUMI Y.

  Research Information Center, Institute of Plasma Physics, Nagoya University

• Matsuoka K.

  Research Information Center, Institute of Plasma Physics, Nagoya University

• Noda N.

  Research Information Center, Institute of Plasma Physics, Nagoya University

• Ohkubo K.

  Research Information Center, Institute of Plasma Physics, Nagoya University

• Tanahashi S.

  Research Information Center, Institute of Plasma Physics, Nagoya University

• Miyamoto K.

  Dept. Biol. Fac. Sci. Tokyo Metro. Univ.

• Matsuura K.

  Research Information Center, Institute of Plasma Physics, Nagoya University

• Kawasumi Y.

  Research Information Center Institute Of Plasma Physics Nagoya University

• Sakurai K.

  Research Information Center, Institute of Plasma Physics, Nagoya University

• Miyamoto K.

  Research Information Center, Institute of Plasma Physics, Nagoya University

• Sato M.

  Research Information Center, Institute of Plasma Physics, Nagoya University

• Kadota K.

  Research Information Center Institute Of Plasma Physics Nagoya University

• Sakurai K.

  Dept. Biol. Fac. Sci. Tokyo Metro. Univ.

• ITOH S.

  Natl. Inst. Basic Biol.

• Noda N.

  Research Information Center Institute Of Plasma Physics Nagoya University

• Fujita J.

  Research Information Center Institute Of Plasma Physics Nagoya University

• Sato K.

  Research Information Center Institute Of Plasma Physics Nagoya University:tokai University

• Tanahashi S.

  Research Information Center Institute Of Plasma Physics Nagoya University

• Ohkubo K.

  Research Information Center Institute Of Plasma Physics Nagoya University

• Miyamoto K.

  Research Information Center Institute Of Plasma Physics Nagoya University:jipp T-ii Group

• Oka Y.

  Research Information Center Institute Of Plasma Physics Nagoya University:plasma Research Center Uni

• Okubo Y.

  Institute Of Plasma Physics Nagoya University

• Itoh S.

  Research Information Center Institute Of Plasma Physics Nagoya University:the Institute Of Physical And Chemical Research

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