Energetic-particle-driven geodesic acoustic modes (EGAMs) channeling in the Large Helical Device (LHD) plasmas are systematically investigated for the first time using MEGA code. MEGA is a hybrid simulation code for energetic particles interacting with a magnetohydrodynamic (MHD) fluid. In the present work, both the energetic particles and the bulk ions are described kinetically. The EGAM profiles in the three-dimensional form is illustrated. Then, EGAM channeling behaviors are analyzed under different conditions. During the EGAM activities without frequency chirping, EGAM channeling occurs in the linear growth stage but terminates in the decay stage after the saturation. During the EGAM activities with frequency chirping, EGAM channeling occurs continuously. Also, low-frequency EGAM makes the energy transfer efficiency () higher, and this is confirmed by changing the energetic particle pressure, energetic particle beam velocity, and energetic particle pitch angle. Moreover, higher bulk ion temperature makes the energy transfer efficiency higher. In addition, under a certain condition, the energy transfer efficiency in the deuterium plasma is lower than that in the hydrogen plasma.
高能量粒子驱动的地声模（EGAM）在大型螺旋装置（LHD）等离子体中的通道效应，首次使用MEGA代码进行了系统研究。MEGA是一种用于高能量粒子与磁流体动力学（MHD）流体相互作用的混合模拟代码。在本工作中，高能量粒子和背景离子均采用动力学描述。以三维形式展示了EGAM的剖面结构。随后，分析了不同条件下的EGAM通道行为。在无频率啁啾的EGAM活动期间，EGAM通道发生在线性增长阶段，但在饱和后的衰减阶段终止。在具有频率啁啾的EGAM活动期间，EGAM通道持续发生。此外，低频EGAM使能量传递效率（）更高，这一点通过改变高能量粒子压强、高能量粒子束速度和粒子投掷角得到了证实。而且，更高的背景离子温度会使能量传递效率更高。另外，在特定条件下，氘等离子体中的能量传递效率低于氢等离子体中的效率。