文献类型：期刊文献

英文题名：Effects of ion temperature anisotropy on an electrostatic turbulent transport in tokamak plasmas

作者：Zhang, Jing[1];Zhang, Debing[1];Zhang, Xianmei[1];Tang, Ruzhi[1];Yu, Limin[1]

机构：[1]East China Univ Sci & Technol, Sch Phys, Shanghai 200237, Peoples R China

年份：2026

卷号：33

期号：1

外文期刊名：PHYSICS OF PLASMAS

收录：;EI(收录号：20260319935179);WOS:【SCI-EXPANDED(收录号:WOS:001659552200001)】；

基金：The authors thank Professor Lei Ye in the Institute of Plasma Physics, Chinese Academy of Sciences for helpful discussion. This work was supported by the National MCF Energy R&D Program of China under Grant No. 2019YFE03060000, and the National Natural Science Foundation of China under Grant No. 12375215.

语种：英文

外文关键词：Anisotropy - Distribution functions - Electrostatics - Nonlinear simulations - Plasma diagnostics - Plasma simulation - Plasma stability - Plasma theory - Thermal gradients - Tokamak devices - Trapped ions - Turbulent flow

摘要：The impacts of ion temperature anisotropy on the linear frequency and the nonlinear transport driven by the electrostatic instability are investigated using the gyrokinetic code NLT in the core region of a deuterium plasma under the cyclone base case parameters. The anisotropy factor T-perpendicular to/T-parallel to is introduced to describe the temperature anisotropy in the equilibrium distribution function, with T-parallel to and T-perpendicular to denoting the parallel and perpendicular temperatures, respectively. These results from linear simulations illustrate that, in the situations with T-perpendicular to/T-parallel to<2.0, the ion temperature gradient (ITG) instability can be significantly suppressed by decreasing T-perpendicular to/T-parallel to, while the trapped electron mode (TEM) is slightly destabilized. In the situations with T-perpendicular to/T-parallel to>2.0, effects of T-perpendicular to/T-parallel to on both the ITG instability and the TEM become less pronounced. The peak around T-perpendicular to/T-parallel to approximate to 2 may depend sensitively on the choice of parameters such as the density and temperature gradients. The nonlinear simulations reveal that the turbulent energy and particle fluxes increase at first and then decrease as the increment of T-perpendicular to/T-parallel to, the peak values appear around T-perpendicular to/T-parallel to=2.0. The poloidal spectrum of the perturbed potential in the nonlinear saturated stage peaks within the ITG-dominant region, indicating the predominant role of the ITG instabilities in driving the turbulent transport. As a comparison, an isotropic temperature scenario presented by a Maxwellian equilibrium distribution with equal energy to the anisotropic distribution is considered. It is found that the growth rate of ITG instability, as well as the ITG-driven energy and particle fluxes, are overestimated in the effective Maxwellian scenario compared to the temperature anisotropy scenario in both T-perpendicular to/T-parallel to<1.0 and T-perpendicular to/T-parallel to>2.0 regions. Especially, when T-perpendicular to/T-parallel to is far away from 1.0, the discrepancy becomes more significant.