论文标题
Tokamak等离子体中各向异性粒子驱动不稳定性的旋转模型
Gyrokinetic modelling of anisotropic energetic particle driven instabilities in tokamak plasmas
论文作者
论文摘要
观察到由中性束产生的能量颗粒，以激发托卡马克斯中的能量粒子驱动的测量模式（EGAM）。我们研究了能量颗粒分布功能各向异性对这种不稳定性激发ORB5的激发的影响。显示了使用ORB5的线性静电模拟显示的数值结果。发现生长速率敏感地取决于分布函数的相位形状。与分散关系的理论分析相比，不稳定性的行为是定性的。逼真的中性束能量颗粒各向异性分布是从加热求解器兔中获得的，并作为输入分布函数引入ORB5。结果显示生长速率对注入角度的依赖性。提出了与实验测量的定性比较，并且发现它们之间几乎没有分歧，这是模拟中的增长率远低于实验。差异的解释是先进的。
Energetic particles produced by neutral beams are observed to excite energetic-particle-driven geodesic acoustic modes (EGAMs) in tokamaks. We study the effects of anisotropy of distribution function of the energetic particles on the excitation of such instabilities with ORB5, a gyrokinetic particle-in-cell code. Numerical results are shown for linear electrostatic simulations with ORB5. The growth rate is found to be sensitively dependent on the phase-space shape of the distribution function. The behavior of the instability is qualitatively compared to the theoretical analysis of dispersion relations. Realistic neutral beam energetic particle anisotropic distributions are obtained from the heating solver RABBIT and are introduced into ORB5 as input distribution function. Results show a dependence of the growth rate on the injection angle. A qualitative comparison to experimental measurements is presented and few disagreements between them are found, being the growth rate in the simulations much lower than that from experiments. An explanation for the difference is advanced.
