增强性能仿星器等离子体的湍流机制

Turbulence Mechanisms of Enhanced Performance Stellarator Plasmas.

作者信息

Xanthopoulos P, Bozhenkov S A, Beurskens M N, Smith H M, Plunk G G, Helander P, Beidler C D, Alcusón J A, Alonso A, Dinklage A, Ford O, Fuchert G, Geiger J, Proll J H E, Pueschel M J, Turkin Y, Warmer F, Team The W-X

机构信息

Max-Planck-Institut für Plasmaphysik, Wendelsteinstraße 1, 17491 Greifswald, Germany.

Eindhoven University of Technology, 5600 MB Eindhoven, The Netherlands.

出版信息

Phys Rev Lett. 2020 Aug 14;125(7):075001. doi: 10.1103/PhysRevLett.125.075001.

DOI:10.1103/PhysRevLett.125.075001

PMID:32857529

Abstract

We theoretically assess two mechanisms thought to be responsible for the enhanced performance observed in plasma discharges of the Wendelstein 7-X stellarator experiment fueled by pellet injection. The effects of the ambipolar radial electric field and the electron density peaking on the turbulent ion heat transport are separately evaluated using large-scale gyrokinetic simulations. The essential role of the stellarator magnetic geometry is demonstrated, by comparison with a tokamak.

摘要

我们从理论上评估了两种被认为是导致在温德尔斯泰因7-X仿星器实验的弹丸注入驱动等离子体放电中观测到性能增强的机制。使用大规模回旋动理学模拟分别评估了双极径向电场和电子密度峰值对湍流离子热输运的影响。通过与托卡马克进行比较，证明了仿星器磁几何结构的重要作用。