Reversal of Simple Hydrogenic Isotope Scaling Laws in Tokamak Edge Turbulence
Reversal of Simple Hydrogenic Isotope Scaling Laws in Tokamak Edge Turbulence
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DOI：
10.1103/physrevlett.125.015001
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发表时间：
2020-06-30
影响因子：
8.6
通讯作者：
Waltz, R. E.
中科院分区：
文献类型：
--
作者：
Belli, E. A.;Candy, J.;Waltz, R. E.
在从离子主导的核心输运体制到电子主导的边缘输运体制的转变中，评估了非绝热电子在调节托卡马克聚变等离子体中回旋动力学湍流的氢同位素质量标度中的作用。我们提出了一个新的同位素-质量标度定律，描述了湍流离子和电子能量通量的电子-离子质量比依赖关系。质量比依赖源于与快速电子平行运动相关的非绝热响应，并在改变（在DIII-D边缘的情况下，有利地逆转）原始陀螺-玻姆标度行为中起关键作用。在反向状态下，氢能通量大于氘通量，这与原始预测相反。
The role of nonadiabatic electrons in regulating the hydrogenic isotope-mass scaling of gyrokinetic turbulence in tokamak fusion plasmas is assessed in the transition from ion-dominated core transport regimes to electron-dominated edge transport regimes. We propose a new isotope-mass scaling law that describes the electron-to-ion mass-ratio dependence of turbulent ion and electron energy fluxes. The massratio dependence arises from the nonadiabatic response associated with fast electron parallel motion and plays a key role in altering-and in the case of the DIII-D edge, favorably reversing-the naive gyro-Bohm scaling behavior. In the reversed regime hydrogen energy fluxes are larger than deuterium fluxes, which is the opposite of the naive prediction.