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Electron cyclotron resonance heating on the TCA tokamak

Z.A. Pietrzyk, A. Pochelon, R. Behn, A. Bondeson, M. Dutch, T.P. Goodman, M.Q. Tran, D.R. Whaley1993年被引用 18Nuclear FusionIF 3出版社

Electron cyclotron resonance heating (ECRH) experiments at 39 GHz with power levels similar to those of Ohmic heating have been conducted in the TCA tokamak in either the X-mode or the O-mode, ECRH was observed to be more efficiently absorbed in low density and low qa discharges. At low density the central electron temperature increased by a factor of two over Ohmic values and the stored energy increased by 40% when up to 80% of the plasma energy was supplied by ECRH. During low density ECRH operation, the electron energy confinement time τEe was the same as during pure Ohmic heating, but at high density τEe degraded with ECRH power. The decrease in the loop voltage required to maintain a constant current during ECRH is a very reproducible quantity and can be attributed in almost all cases to the change in the electron temperature. Sawtooth stabilization occurred during ECRH, with a sawtooth period of up to ten times longer than that before ECRH. This stabilization depends on the ECRH toroidal injection angle and the total input power. High energy ions were observed and their production is attributed, as in earlier experiments, to a three-wave interaction process

日本語訳

電子サイクロトロン共鳴加熱(ECRH)実験を、TCAトカマクにおいて、オーミック加熱と同程度のパワーを持つ39 GHzの周波数で、XモードまたはOモードのいずれかで実施した。ECRHは、低密度かつ低qaの放電においてより効率的に吸収されることが観測された。低密度時には、プラズマエネルギーの最大80%がECRHによって供給された場合、中心電子温度はオーミック加熱時の値の2倍に増加し、蓄積エネルギーは40%増加した。低密度でのECRH運転中、電子エネルギー閉じ込め時間τEeは純粋なオーミック加熱時と同じであったが、高密度ではτEeはECRHパワーとともに劣化した。ECRH中に一定電流を維持するために必要なループ電圧の低下は、非常に再現性が高く、ほぼ全ての場合において電子温度の変化に起因するものであった。ECRH中には鋸歯状振動の安定化が観測され、鋸歯状周期はECRH前の最大10倍に延長された。この安定化は、ECRHのトロイダル入射角と総入力パワーに依存した。高エネルギーイオンの生成が観測され、その生成機構は、以前の実験と同様に、三波相互作用過程に帰属された。

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