Reduction or Enhancement of Stellarator Turbulence by Impurities,Physical Review Letters

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Reduction or Enhancement of Stellarator Turbulence by Impurities
Physical Review Letters ( IF 8.1 ) Pub Date : 2024-09-06 , DOI: 10.1103/physrevlett.133.105101
J. M. García-Regaña ₁ , I. Calvo ₁ , F. I. Parra ₂ , H. Thienpondt ₁

Affiliation

A systematic study of the impact of impurities on the turbulent heat fluxes is presented for the stellarator Wendelstein 7-X (W7-X) and, for comparison, the Large Helical Device and ITER. By means of nonlinear multispecies gyrokinetic simulations, it is shown that impurities, depending on the sign of their density gradient, can significantly enhance or reduce turbulent ion heat losses. For the relevant scenario of turbulence reduction, an optimal impurity concentration that minimizes the ion heat diffusivity emerges as a universal feature. This result demonstrates the potential of impurities for controlling turbulence and accessing enhanced confinement regimes in fusion plasmas and, in particular, in W7-X.

Published by the American Physical Society

2024

中文翻译：

杂质减少或增强恒星湍流

对杂质对湍流热通量的影响进行了系统的研究，用于仿星器 Wendelstein 7-X （W7-X），以及用于比较的大螺旋器件和 ITER。通过非线性多物种陀螺动力学模拟，表明杂质（取决于其密度梯度的标志）可以显著增加或减少湍流离子热损失。对于减少湍流的相关场景，使离子热扩散率最小的最佳杂质浓度成为一个普遍的特征。这一结果表明，杂质在控制聚变等离子体（尤其是 W7-X）中具有控制湍流和增强约束机制的潜力。美国物理学会 2024 年出版

更新日期：2024-09-06

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