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Current profile modification experiments in EXTRAP T2R

M Cecconello, J-A Malmberg, G Spizzo, B E Chapman, R M Gravestjin, P Franz, P Piovesan, P Martin, J R Drake2004年Plasma Physics and Controlled FusionIF 2.2出版社

Pulsed poloidal current drive (PPCD) experiments have been conducted in the resistive shell EXTRAP T2R reversed-field pinch experiment. During the current profile modification phase, the fluctuation level of the m = 1 internally resonant tearing modes decreases, and the velocity of these modes increases. The m = 0 modes are not affected during PPCD, although termination occurs with a burst in the m = 0 amplitude. The PPCD phase is characterized by an increase in the central electron temperature (up to 380 eV) and in the soft x-ray signal. Spectroscopic observations confirm an increase in the central electron temperature. During PPCD, the plasma poloidal beta increases to 14%, and the estimated energy confinement time doubles, reaching 380 µs. The reduction in the fluctuation level and the corresponding increase in the energy confinement time are qualitatively consistent with a reduction in parallel transport along stochastic magnetic field lines.

日本語訳

パルス状ポロイダル電流駆動(PPCD)実験が、抵抗性シェルを有するEXTRAP T2R逆転磁場ピンチ実験装置において実施された。電流分布修飾フェーズ中、m = 1内部共鳴テアリングモードの変動レベルは減少し、これらのモードの速度は増加した。m = 0モードはPPCD中には影響を受けないが、終端はm = 0振幅のバーストを伴って発生する。PPCDフェーズは、中心電子温度(最大380 eV)と軟X線シグナルの増加によって特徴づけられる。分光学観測により、中心電子温度の上昇が確認された。PPCD中、プラズマのポロイダルベータ値は14%まで増加し、推定されるエネルギー閉じ込め時間は2倍に達して380 µsとなった。変動レベルの低減とそれに対応するエネルギー閉じ込め時間の増加は、確率的磁力線に沿った平行輸送の低減と定性的に一致する。

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