摘要
阐明氢同位素对微观湍流的影响对提高等离子体约束性能至关重要,本文使用全局回旋动理学模拟研究了仿星器W7-X中氢同位素对ITG微湍流的影响。线性模拟表明W7-X中氢同位素等离子体ITG微观湍流归一化增长率符合回旋玻姆标度的离子质量依赖关系,即γ/k⊥2∝mi1/2。离子质量对ITG模环向耦合谐波数量有明显的影响,即氢同位素离子质量越重,其ITG模环向耦合谐波越少。非线性模拟表明带状流可以打散离子温度梯度模模结构,减小涡流尺寸,抑制湍流输运,且氢同位素离子质量越重,带状流对其湍流的抑制作用越强。
It is important to clarify the effect of hydrogen isotope on microturbulence to improve the confine-ment performance of plasma. In this paper, the effects of hydrogen isotope species on microturbulence in stellarator W7-X are studied by using global gyrokinetic simulation. The linear simulation shows that the ITG mode normalized growth rate of hydrogen isotope plasma in W7-X conforms to gyro-Bohm scale ion-mass dependence, that is γ/k⊥2∝mi1/2, the ion mass of hydrogen isotope has an obvious effect on ITG mode toroidal coupled harmonics, that is, the heavier the hydrogen isotope ion mass, the less ITG mode toroidal coupled harmonics. The nonlinear simulation shows that the zonal flow can break up the ion temperature gradient structure, reduce the eddy size, and suppress the turbulent transport. The heavier the ion mass of the hydrogen isotope, the stronger the suppress effect of the zonal flow on turbulence.
出处
《核科学与技术》
2023年第3期199-209,共11页
Nuclear Science and Technology
