Turbulent particle pinch in gyrokinetic flux-driven ITG/TEM turbulence

Kenji Imadera, Yasuaki Kishimoto, Akihiro Ishizawa2024年8月Nuclear FusionIF 3 出版社

Aiming at a fuel supply through particle pinch effects, turbulent particle transport is studied by gyrokinetic flux-driven Ion-Temperature-Gradient/Trapped-Electron-Mode (ITG/TEM) simulations. It is found that ITG/TEM turbulence can drive ion particle pinch by E × B drift (n ≠ 0) when the ion temperature gradient is steep enough. Electron particle pinch is also driven by E × B drift (n ≠ 0) in the case with the steep electron temperature gradient. Such an electron particle pinch can trigger an ambipolar electric field, leading to additional ion particle pinch by not only magnetic drift but also E × B drift (n = 0). These results suggest that a density peaking of bulk ions due to turbulent fluctuations can be achieved by sufficiently strong both ion and electron heating.

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ENThis paper would be of interest to fusion researchers studying plasma transport and confinement, as well as those working on developing improved fusion reactor designs. The findings could help optimize fuel supply and density profiles in future fusion devices.#FusionPlasmas #ParticlePinch #PlasmaTransport #FuelDensity #FusionReactorDesign

This paper investigates how turbulent fluctuations in fusion plasmas can drive particle transport, leading to a concentration of fuel ions. The simulations show that strong ion and electron heating can create particle pinch effects, where particles are drawn towards the center of the plasma. This could help maintain a high density of fuel, improving fusion performance.

乱流粒子ピンチ効果を利用したイオン・電子密度ピーキング

本研究は、イオン温度勾配/閉じ込められた電子モード(ITG/TEM)乱流シミュレーションを用いて、粒子輸送におけるピンチ効果を解明したものです。ITG/TEM乱流により、イオン温度勾配が十分に大きい場合にE×B ドリフトによるイオン粒子ピンチが発生し、また電子温度勾配が大きい場合に電子粒子ピンチが起こることを示しています。この電子ピンチにより、アンビポーラ電場が生成され、さらにイオン粒子ピンチが磁場ドリフトとE×B ドリフトの両方によって引き起こされることを明らかにしています。