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Dependence of L-mode confinement on the electron cyclotron power deposition profile in the TCV tokamak

N A Kirneva, K A Razumova, A Pochelon, R Behn, S Coda, L Curchod, B P Duval, T P Goodman, B Labit, A N Karpushov2012年Plasma Physics and Controlled FusionIF 2.2出版社

Scenarios with different electron cyclotron heating power profile distributions and widths were compared for the first time in experiments on the Tokamak à Configuration Variable (TCV). The heating profile was changed from shot to shot over a wide range from localized on-axis, with normalized minor radius half-width at half maximum σ1/2 ∼ 0.1, up to a widely distributed heating power profile with σ1/2 ∼ 0.4 and finally to a profile peaked far off-axis. The global confinement, MHD activity, density, temperature and electron pressure profile evolution were compared. In particular, the energy confinement properties of discharges with localized on-axis heating and distributed on-axis heating were very similar, with degradation close to that predicted by the ITER L-mode scaling; in the case of off-axis heating, on the other hand, the confinement degradation was even stronger.

日本語訳

異なる電子サイクロトロン加熱パワー分布とその幅を持つシナリオを、トカマク・ア・コンフィギュラシオン・バリアブル(TCV)での実験において初めて比較した。加熱分布は、規格化された小半径半値全幅σ1/2~0.1の局所的なオン軸加熱から、σ1/2~0.4の広く分布した加熱パワー分布、さらには遠いオフ軸にピークを持つ分布まで、ショットごとに広範囲に変化させた。全体の閉じ込め、MHD活動、密度、温度、および電子圧力分布の時間発展を比較した。特に、局所的なオン軸加熱と分布したオン軸加熱の場合のエネルギー閉じ込め特性は非常に類似しており、その劣化はITER Lモードスケーリングで予測されるものに近かった。一方、オフ軸加熱の場合には、閉じ込めの劣化はさらに強かった。

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