<RESEARCH REPORT>AN ICRF CURRENT DRIVE EXPERIMENT ON JIPP T-IIU
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概要
- 論文の詳細を見る
In JIPP T-IIU tokamak the fast wave current drive by five loop antennas has been successfully carried out with a relatively high density plasma (ω^2_<pe>/ω^2_<ce> ∿ 5). The RF frequency is 40 MHz and the toroidal field is 2kG, which corresponds to ω=13ω_<cH>. To exclude the effect of the inductive field, the plasma production and the start-up of the plasma current have been done with ICRF wave only. The density and temperature of a plasma produced by the RF wave are that n^^-_e ∿ 2×10^<18>m^<-3> and T_e ∿ 10eV, where only the fast wave can propagate excluding out the possibility of a slow wave current drive. This density is two orders of magnitude higher than the density limit predicted for the slow wave current drive. The maximum plasma current of 3.5kA is driven with the rf power of about 400kW. The efficiency η=I_pn^^-_eR/P_<rf> is around 2×10^<16> A・m^<-2>/W, which is two orders of magnitude lower than that of recent lower hybrid current drive. A large MHD oscillation is observed and the electron temperature is limited around 10eV, although the safety factor q_α is about 10 or more. The relatively low current drive efficiency observed will be attributed to the low electron temperature. We have observed the clear dependence of the current drive efficiency as a function of the phase difference Δφ. When antennas are phased with Δφ=π/4,the maximum efficiency is obtained. A calculation shows that the wave spectrum is then peaked around N_∥ ∿ 4.
- 核融合科学研究所の論文
著者
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Watari T.
Institute of Laser Engineering, Osaka Univ.
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ANDO R.
Institute of Plasma Physics, Nagoya University
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KAKO E.
Institute of Plasma Physics, Nagoya University
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OGAWA Y.
Institute of Plasma Physics, Nagoya University
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ANDO R.
Research Information Center, Institute of Plasma Physics, Nagoya University
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Kako E.
Research Information Center Institute Of Plasma Physics Nagoya University:national Laboratory For Hi
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Ando R.
Research Information Center Institute Of Plasma Physics Nagoya University
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Watari T.
Institute Of Plasma Physics Nagoya University
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Osanai Y.
Research Information Center Institute Of Plasma Physics Nagoya University
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Watari T.
Institute Of Laser Engineering Osaka Univ.
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Oka Y.
Research Information Center Institute Of Plasma Physics Nagoya University:plasma Research Center Uni
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Okubo Y.
Institute Of Plasma Physics Nagoya University
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