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Gyrokinetic simulation of pedestal degradation correlated with enhanced magnetic turbulence in a DIII-D ELMy H-mode discharge

X Jian, J Chen, C Holland, V S Chan, X R Zhang, G Yu, Z Yan2024年Plasma Physics and Controlled FusionIF 2.2出版社

Gyrokinetic simulation of a dedicated pedestal density ramping-up discharge on DIII-D can reproduce the enhancement of magnetic turbulence in the pedestal, which is identified to be caused by micro-tearing modes (MTMs). An increase of MTM amplitude results in higher electron thermal diffusivity, consistent with experimentally observed lower electron temperature gradient and degraded pedestal height. Gyrokinetic simulation identifies the major cause of MTM enhancement to be the increase of collisionality, which has a significant impact on the MTM intensity and is beyond the description of any (quasi-)linear theory.

日本語訳

DIII-Dにおける専用のペデスタル密度ランプアップ放電のジャイロ運動論シミュレーションは、ペデスタルにおける磁気乱流の増強を再現することができ、これは微細ティアリングモード(MTM)に起因すると同定された。MTM振幅の増加は電子熱拡散率の上昇をもたらし、実験で観測されたより低い電子温度勾配および劣化したペデスタル高さと一致する。ジャイロ運動論シミュレーションは、MTM増強の主な原因が衝突率の増加であることを特定する。これはMTM強度に有意な影響を及ぼし、あらゆる(準)線形理論の記述を超えている。

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diii-d高精度(タイトル一致)

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DIII-DEdge localized modeH-modeGyrokineticPedestalELMy H-mode
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