Energetic Particle-induced Geodesic Acoustic Mode

Fu, G.Y.

关键词: ACOUSTICS;    CONFINEMENT;    DOUBLET-3 DEVICE;    GEODESICS;    KINETICS;    PLASMA;    PLASMA CONFINEMENT;    SAFETY Tokamaks;    Wave Interaction;    Particles;    Oscillations;    Low Frequency;   

DOI  :  10.2172/938974
RP-ID  :  PPPL-4347
PID  :  OSTI ID: 938974
Others  :  TRN: US0806763

学科分类：原子、分子光学和等离子物理

美国|英语

来源: SciTech Connect

【 摘 要 】

A new energetic particle-induced Geodesic Acoustic Mode (EGAM) is shown to exist. The mode frequency, mode structure, and mode destabilization are determined non-perturbatively by energetic particle kinetic effects. In particular the EGAM frequency is found to be substantially lower than the standard GAM frequency. The radial mode width is determined by the energetic particle drift orbit width and can be fairly large for high energetic particle pressure and large safety factor. These results are consistent with the recent experimental observation of the beam- driven n=0 mode in DIII-D. The new mode is important since it can degrade energetic particle confinement as shown in the DIII-D experiments. The new mode may also affect the thermal plasma confinement via its interaction with plasma micro-turbulence.