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Heat transport driven by the ion temperature gradient and electron temperature gradient instabilities in ASDEX Upgrade H-modes

F. Ryter, C. Angioni, M. Dunne, R. Fischer, B. Kurzan, A. Lebschy, R.M. McDermott, W. Suttrop, G. Tardini, E. Viezzer2019年被引用 31Nuclear FusionIF 3出版社

A study of the properties of the turbulence-driven ion and electron heat fluxes, is presented. Dedicated H-mode experiments taking advantage of the on-axis and off-axis possibilities of both neutral beam injection and electron cyclotron resonance heating available on the ASDEX Upgrade tokamak were carried out. The experimental results are interpreted by comparisons with gyrokinetic calculations. Ion heat transport is, as expected, driven by the ion temperature gradient (ITG) instability with the features predicted by theory: increase of the driven heat flux above a threshold in normalised gradient. In addition the main effects known to impact on the stability of the turbulence, temperature ratio and fast ions population, are exhibited by the experimental results and agree with the gyrokinetic calculations. It is known that the ITG also contributes to the electron heat flux, but that an electron instability can be required in addition when the ITG contribution does not drive the whole imposed electron heating. This situation, investigated by adding electron cyclotron heating, indicates that in the experiments presented here the electron temperature gradient instability develops.

日本語訳

乱流駆動のイオン熱流束と電子熱流束の特性に関する研究を提示する。ASDEX Upgradeトカマクで利用可能な中性粒子ビーム入射と電子サイクロトロン共鳴加熱の軸上・軸外入射の利点を活用した、専用のHモード実験を実施した。実験結果はジャイロ運動論的計算との比較によって解釈される。イオン熱輸送は、予想通り、イオン温度勾配(ITG)不安定性によって駆動され、理論が予測する特徴、すなわち規格化勾配における閾値以上の駆動熱流束の増加を示す。さらに、乱流の安定性に影響を与える既知の主要因子である温度比と高速イオン集団の効果が実験結果に現れており、ジャイロ運動論的計算と一致する。ITGが電子熱流束にも寄与することが知られているが、ITGによる駆動が印加された電子加熱全体を説明できない場合には、電子系の不安定性が追加で必要となることがある。この状況を、電子サイクロトロン加熱を追加して調査した結果、本実験では電子温度勾配不安定性が発達することが示された。

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asdex-upgrade高精度(タイトル一致)

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ASDEXASDEX UpgradeIon temperature gradientHeat transportElectron temperature gradient
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