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Experimental study of high-k turbulence during an energy confinement degradation phase in EAST ohmic plasmas

P.J. Sun, Y.D. Li, Y. Ren, X.D. Zhang, G.J. Wu, Y.M. Wang, Y. Liu, T.F. Zhou, X. Gu, X.Q. Yuan2020年被引用 4Nuclear FusionIF 3出版社

In this paper, we present experimental studies of both high-kr ( cm−1, and , respectively; ) and high- ( cm−1, and , respectively; ) turbulence behavior during an ohmic energy confinement degradation phase in experimental advanced superconducting tokamak (EAST). High-kr turbulence from density fluctuation at and high- turbulence from density fluctuation at –0.97 were measured by tangential and poloidal CO2 laser collective scattering diagnostics, respectively. Note that kr, , and are radial wavenumber, poloidal wavenumber, perpendicular wavenumber and ion gyroradius at electron temperature, respectively. Both high-kr/ turbulence power and energy confinement time are found to be temporally correlated to line-averaged electron density ne in the plasma current flat-top phase (Ip  =  0.4 MA): when the ne shows continuous increase/decrease, the high-kr/ turbulence power increases/decreases correspondingly and the shows corresponding decrease/increase; the stable ne is related to stable both and high-kr/ turbulence power. Statistical results of high-kr/ turbulence power versus further imply that high-kr/ turbulence shows a strong correlation with plasma energy confinement degradation in high line-averaged ne condition, but high-kr and high- turbulence have relatively weak and no dependence on the transition between linear range in low-ne condition and energy confinement degradation in the high-ne condition, respectively. Moreover, profiles of electron temperature Te and ne as well as their normalized gradients in a part of high- density fluctuation measurement region also have been given to qualitatively explain the enhancement of turbulence power with the increase of line-averaged ne.

日本語訳

本論文では、実験的先進超伝導トカマク(EAST)におけるオーミックエネルギー閉じ込め劣化位相中の高kr(cm−1、および、それぞれ;)および高(cm−1、および、それぞれ;)乱流挙動の実験研究について発表する。高kr密度揺らぎによる密度変動および高乱流による密度変動–0.97は、それぞれ接線方向およびポロイダル方向のCO2レーザーコレクティブ散乱診断によって測定された。なお、kr、、、およびは、それぞれ動径波数、ポロイダル波数、垂直波数、および電子温度におけるイオンジャイロ半径である。高kr/乱流パワーとエネルギー閉じ込め時間の両方は、プラズマ電流フラットトップ位相(Ip  =  0.4 MA)において、線平均電子密度neと時間的に相関することが見出された:neが連続的に増加/減少すると、高kr/乱流パワーは対応して増加/減少し、は対応する減少/増加を示す;安定したneは、安定したおよび高kr/乱流パワーの両方に関連する。高kr/乱流パワー対の統計的結果は、高kr/乱流が高線平均ne条件におけるプラズマエネルギー閉じ込め劣化と強い相関を示すが、高krおよび高乱流は、それぞれ低ne条件における線形領域と高ne条件におけるエネルギー閉じ込め劣化との間の遷移に対して、比較的弱い依存性および依存性を示さないことをさらに示唆している。さらに、高密度揺らぎ測定領域の一部における電子温度Teおよびneの分布と、それらの規格化勾配も、線平均neの増加に伴う乱流パワーの増大を定性的に説明するために示されている。

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east高精度(タイトル一致)

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EASTOhmic heatingEnergy confinement
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