温德斯坦 7-X 放电的全局陀螺动力学分析：揭示困电子模式和电子温度梯度湍流的重要性

IF 3.5 1区物理与天体物理 Q1 PHYSICS, FLUIDS & PLASMAS

Nuclear Fusion Pub Date : 2024-08-11 DOI:10.1088/1741-4326/ad6675

Felix Wilms, Alejandro Bañón Navarro, Thomas Windisch, Sergey Bozhenkov, Felix Warmer, Golo Fuchert, Oliver Ford, Daihong Zhang, Torsten Stange, Frank Jenko and the W7-X Team

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引用次数: 0

摘要

我们首次对温德斯坦 7-X 类恒星器的放电进行了非线性、陀螺动力学、径向全局模拟，包括动能电子、平衡径向电场以及电磁和碰撞效应。通过与通量管和全流面模拟的比较，我们评估了平衡 ExB 流和流动剪切对湍流稳定的影响。与现有文献相比，我们进一步提供了大量证据，证明等离子体核心的湍流电子热通量是由困电子模式和电子温度梯度湍流驱动的。前者与离子-温度梯度湍流混合在一起，主要由有限的电子温度梯度驱动，而现有文献中的非线性恒星器模拟在很大程度上忽略了电子温度梯度。

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Global gyrokinetic analysis of Wendelstein 7-X discharge: unveiling the importance of trapped-electron-mode and electron-temperature-gradient turbulence

We present the first nonlinear, gyrokinetic, radially global simulation of a discharge of the Wendelstein 7-X-like stellarator, including kinetic electrons, an equilibrium radial electric field, as well as electromagnetic and collisional effects. By comparison against flux-tube and full-flux-surface simulations, we assess the impact of the equilibrium ExB-flow and flow shear on the stabilisation of turbulence. In contrast to the existing literature, we further provide substantial evidence for the turbulent electron heat flux being driven by trapped-electron-mode and electron-temperature-gradient turbulence in the core of the plasma. The former manifests as a hybrid together with ion-temperature-gradient turbulence and is primarily driven by the finite electron temperature gradient, which has largely been neglected in nonlinear stellarator simulations presented in the existing literature.

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来源期刊

Nuclear Fusion 物理-物理：核物理

CiteScore

6.30

自引率

39.40%

发文量

411

审稿时长

2.6 months

期刊介绍： Nuclear Fusion publishes articles making significant advances to the field of controlled thermonuclear fusion. The journal scope includes: -the production, heating and confinement of high temperature plasmas; -the physical properties of such plasmas; -the experimental or theoretical methods of exploring or explaining them; -fusion reactor physics; -reactor concepts; and -fusion technologies. The journal has a dedicated Associate Editor for inertial confinement fusion.