Effects of hydrogen isotope species on ITG microturbulence in LHD

IF 2.1 2区物理与天体物理 Q2 PHYSICS, FLUIDS & PLASMAS

Plasma Physics and Controlled Fusion Pub Date : 2023-12-14 DOI:10.1088/1361-6587/ad15f0

Y. Q. Qin, Yichao Chen, Guo-Ya Sun, J. Nicolau, Zhihong Lin

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Abstract

The linear and nonlinear effects of hydrogen isotope species on ion temperature gradient mode (ITG) in the Large Helical Device (LHD) stellarator are studied using radially global gyrokinetic simulation. We found that the coupling range of linear toroidal harmonics depends on the ion mass of the hydrogen isotope. The growth rate profiles of ITG mode are almost the same for H, D, and T plasmas, indicating a gyro-Bohm scaling of ion-mass dependence. The nonlinear electrostatic simulations show that the zonal flow breaks the radially elongated eigenmode structures and reduces the size of the turbulence eddies, which suppresses the turbulence and the ion heat transport in the LHD. The turbulence amplitude without the zonal flow is almost the same for H, D, and T plasmas, while it decreases with increasing the ion mass of the hydrogen isotope when the zonal flow is present. The reduction of the turbulent transport with larger ion mass is mostly due to the enhancement of zonal fows by larger ion mass. The ion heat conductivity deviates from the gyro-Bohm scaling for both cases with and without the zonal flow.

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氢同位素物种对 LHD 中 ITG 微扰动的影响

利用径向全局陀螺动力学模拟研究了氢同位素物种对大型螺旋装置（LHD）恒星器中离子温度梯度模式（ITG）的线性和非线性影响。我们发现线性环状谐波的耦合范围取决于氢同位素的离子质量。对于 H、D 和 T 等离子体，ITG 模式的增长率曲线几乎相同，这表明离子质量依赖于陀螺-玻姆比例。非线性静电模拟表明，带状流打破了径向拉长的特征模式结构，减小了湍流涡的大小，从而抑制了 LHD 中的湍流和离子热传输。对于 H、D 和 T 等离子体来说，没有带状流时的湍流振幅几乎相同，而当存在带状流时，湍流振幅会随着氢同位素离子质量的增加而减小。离子质量越大，湍流输运越小，这主要是由于离子质量越大，带状流越强。在存在和不存在带状流的两种情况下，离子热导率都偏离了陀螺-玻姆比例。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Plasma Physics and Controlled Fusion 物理-物理：核物理

CiteScore

4.50

自引率

13.60%

发文量

224

审稿时长

4.5 months

期刊介绍： Plasma Physics and Controlled Fusion covers all aspects of the physics of hot, highly ionised plasmas. This includes results of current experimental and theoretical research on all aspects of the physics of high-temperature plasmas and of controlled nuclear fusion, including the basic phenomena in highly-ionised gases in the laboratory, in the ionosphere and in space, in magnetic-confinement and inertial-confinement fusion as well as related diagnostic methods. Papers with a technological emphasis, for example in such topics as plasma control, fusion technology and diagnostics, are welcomed when the plasma physics is an integral part of the paper or when the technology is unique to plasma applications or new to the field of plasma physics. Papers on dusty plasma physics are welcome when there is a clear relevance to fusion.