EAST上高能离子诱发具有径向离散结构的测地声模的实验研究

高能离子诱发测地声模（EGAMs）为环向模数为0的一类特殊不稳定性，其电磁特征已在EAST托卡马克上得到深入研究。EAST最新的实验现象发现了一类具有径向离散特征的EGAMs不稳定性，并伴随着增强的径向湍流输运过程。然而，目前实验或理论上关于径向离散EGAMs或GAMs的爆发机制还不清楚，且这类EGAMs不稳定性和高能离子的约束或热粒子的湍流输运之间的关系还不明朗。因此，本项目将基于已经观察到的实验现象，并结合EAST上多套加热手段和高分辨的诊断工具，通过实验、理论和模拟相结合的方式，期望获得这类径向离散EGAMs不稳定性的各种基本特征。这些研究工作的顺利开展，可以有效的提高EAST上高能离子的约束，提高我们对这类不稳定性的认识水平，并为将来ITER和CFETR上发展这类不稳定性的控制方法提供实验基础和可借鉴的方案。

Energetic ions induced Geodesic Acoustic Modes (EGAMs) are special instabilities with toroidal mode number n=0, and the basic electromagnetic characteristics have been investigated in EAST. New characteristics of EGAMs with discrete in the radial direction has been observed in EAST currently, and the turbulence transport has been increased accordingly. However, the internal mechanism of the discrete EGAMs or GAMs in the radial direction is vague, and the interaction among the EGAMs, the confinement of energetic ions and the turbulence transport of thermal particles is unclear. Therefore, this program is based on the phenomena of the EGAMs with discrete structures in the radial direction that have been observed in EAST, and with the help of a various of heating ways and newly developed high spatial resolution diagnostic tools.The basic characteristics of the EGAMs instabilities are achieved expectantly by experiments, theoretical analysis and numerical simulation. Those research works carried out favorably can improve the confinement of energetic ions in EAST efficiently, and can raise our understanding in the instabilities, and offer the experiment basis and referential experience for the future ITER and CFETR.