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Interaction of magnetic islands with turbulent electron temperature fluctuations in DIII-D and in GENE nonlinear gyrokinetic simulations

L Bardóczi, C Sung, A Bañón Navarro, T L Rhodes, T A Carter, F Jenko2020年Plasma Physics and Controlled FusionIF 2.2出版社

We present localized measurements of interactions between neoclassical tearing modes (NTMs) and turbulent electron temperature fluctuations () in the expected kθρs = 0–0.5 wave-number range of the ion temperature gradient (ITG) instability measured via correlation electron cyclotron emission (kθ and ρs are the poloidal wave-number and ion-sound Larmor radius, respectively). Comparison to GENE gyrokinetic simulations, shows qualitative agreement with being reduced (increased) inside (outside) of the islands due to modified local gradients, and being higher (lower) in the region outside the island where lower (higher) flow shear is expected due to radially asymmetric island shape. These results are consistent with previously reported modifications of long and intermediate wavelength turbulent density fluctuations and cross-field electron thermal diffusivity reduction at the O-point of magnetic islands. Interestingly, a 30% increase of is detected at the NTM rational surface when the island width is a few times ρs, which is replicated by GENE through zonal flow damping due to the destroyed magnetic field topology of the NTM rational surface.

日本語訳

我々は、新古典テアリングモード(NTM)と乱流電子温度揺らぎ( )との間の相互作用の局所測定を提示する。これは、イオン温度勾配(ITG)不安定性の予想されるkθρs = 0–0.5波数範囲において、相関電子サイクロトロン放射(kθとρsはそれぞれポロイダル波数とイオン音波ラーモア半径である)によって測定されたものである。GENEジャイロ運動論シミュレーションとの比較は、修正された局所勾配により島の内部で( )が減少し、外部で増加すること、および動径方向に非対称な島形状により低い(高い)流れシアーが予想される島の外部領域で( )が高く(低く)なることと定性的に一致する。これらの結果は、磁気島のO点における長波長および中間波長の乱流密度揺らぎの修正と、横断方向の電子熱拡散係数の低減に関する既報の結果と一致する。興味深いことに、島幅が数ρsのとき、NTM有理面上で( )の30%増加が検出され、これはGENEによって、NTM有理面の破壊された磁場トポロジーによる帯状流減衰を通じて再現される。

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diii-d高精度(タイトル一致)

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DIII-DGyrokineticMagnetic islands
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