<RESEARCH REPORT>PLASMA CURRENT STARTUP BY LOWER HYBRID WAVES IN THE JIPP T-IIU TOKAMAK

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概要

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• This paper describes the characteristic behaviours of lower hybrid current startup in JIPP T-IIU. The current startup is carried out by injection of 800MHz lower hybrid waves into cold and low density plasmas (Te=10-20eV, n^^^-_e=1-2×10^<12>cm^<-3>) produced by electron cyclotron resonance or lower hybrid waves only. The plasma current rises up with a characterisitc rise time τ_r(≳30-50ms) and approaches a quasi-steady state value I_pm (=5-20kA), when LHW power of 10-50kW is injected into a torus, controlling the vertical field. The rise time is inversely proportional to the bulk electron density n^^^-_e, and is comparable to the collision time of current-carrying high energy electrons with bulk plasmas. On the other hand, the current drive efficiency in the quasi-steady state is almost independent of n^^^-_e, i.e., I_pm/P_LH=0.4-0.7A/W for n^^^-_e=0.8-4×10^<12>cm^<-3>. The conversion efficiency of rf energy injected into the torus is typically 5% during current rise phase, and 10% at the most efficient case. The effects of the initial injection of ECH power and the observed parametric instabilities on the current startup are investigated from a viewpoint of seed current generation. During rapid current rise when appreciably negative loop voltage is observed the bulk electrons are heated up to 150eV. Various heating machanisms responsible for the bulk electron heating are discussed.

• 核融合科学研究所の論文

著者

• Toi K.

  Research Information Center Institute Of Plasma Physics Nagoya University

• Tetsuka T.

  Research Information Center Institute Of Plasma Physics Nagoya University

• Sato K.

  Institute of Plasma Physics, Nagoya University

• Toi K.

  Institute of Plasma Physics, Nagoya University

• HAMADA Y.

  Institute of Plasma Physics, Nagoya University

• OHKUBO K.

  Institute of Plasma Physics, Nagoya University

• HIROKURA S.

  Institute of Plasma Physics, Nagoya University

• KAKO E.

  Institute of Plasma Physics, Nagoya University

• KAWAHATA K.

  Institute of Plasma Physics, Nagoya University

• KAWASUMI Y.

  Institute of Plasma Physics, Nagoya University

• KITAGAWA S.

  Institute of Plasma Physics, Nagoya University

• MATSUOKA K.

  Institute of Plasma Physics, Nagoya University

• OGAWA I.

  Institute of Plasma Physics, Nagoya University

• OGAWA Y.

  Institute of Plasma Physics, Nagoya University

• TANAHASHI S.

  Institute of Plasma Physics, Nagoya University

• TANIGUCHI Y.

  Institute of Plasma Physics, Nagoya University

• Tanaka S.

  Biol. Lab. Nippon Med. Schl.

• Hayashi Y.

  Research Information Center Institute Of Plasma Physics Nagoya University

• Sato K.

  Research Information Center Institute Of Plasma Physics Nagoya University

• Kawahata K.

  Research Information Center Institute Of Plasma Physics Nagoya University

• Hiroe S.

  Research Information Center Institute Of Plasma Physics Nagoya University

• KAWASUMI Y.

  Research Information Center, Institute of Plasma Physics, Nagoya University

• KITAGAWA S.

  Research Information Center, Institute of Plasma Physics, Nagoya University

• Noda N.

  Research Information Center, Institute of Plasma Physics, Nagoya University

• Noda N.

  Institute of Plasma Physics, Nagoya University

• TETSUKA T.

  Institute of Plasma Physics, Nagoya University

• Miyamoto K.

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

• Kako E.

  Research Information Center Institute Of Plasma Physics Nagoya University:national Laboratory For Hi

• Kawasumi Y.

  Research Information Center Institute Of Plasma Physics Nagoya University

• Sato K.

  Institute Of Plasma Physics Nagoya University

• Kitagawa S.

  Research Information Center Institute Of Plasma Physics Nagoya University

• Hirokura S.

  Research Information Center Institute Of Plasma Physics Nagoya University

• Sunako K.

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

• Kadota K.

  Research Information Center Institute Of Plasma Physics Nagoya University

• Terumichi Y.

  Research Information Center Institute Of Plasma Physics Nagoya University:department Of Physics Facu

• Matsuura K.

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

• Sato K.

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

• Noda N.

  Research Information Center Institute Of Plasma Physics Nagoya University

• Fujita J.

  Research Information Center Institute Of Plasma Physics Nagoya University

• Tetsuka T.

  Institute Of Plasma Physics Nagoya University

• Sato K.

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

• Takasugi K.

  Research Information Center Institute Of Plasma Physics Nagoya University

• Osanai Y.

  Research Information Center Institute Of Plasma Physics Nagoya University

• Tanahashi S.

  Research Information Center Institute Of Plasma Physics Nagoya University

• Ohkubo K.

  Research Information Center Institute Of Plasma Physics Nagoya University

• Kawahata K.

  Plasma Physics Laboratory Kyoto University

• Noda N.

  Institute Of Plasma Physics Nagoya University

• Hamada Y.

  Research Information Center Institute Of Plasma Physics Nagoya University

• Haruyama Y.

  Research Information Center Institute Of Plasma Physics Nagoya University:faculty Of Engineering Kyo

• Ogawa I.

  Research Information Center Institute Of Plasma Physics Nagoya University

• Kawahata K.

  Institute Of Plasma Physics Nagoya University

• Haruyama Y.

  Research Information Center Institute Of Plasma Physics Nagoya University:faculty Of Engineering Kyoto Univ.

• Okubo Y.

  Institute Of Plasma Physics Nagoya University

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