期刊
NUCLEAR FUSION
卷 57, 期 5, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/1741-4326/aa6232
关键词
fast ions; non-linear dynamics; wave chirping; plasma instabilities
资金
- Sao Paulo Research Foundation (FAPESP, Brazil) [2012/22830-2, 2014/03289-4]
- US Department of Energy (DOE) [DE-AC02-09CH11466, DE-FC02-04ER54698]
- University of Sao Paulo-Princeton University Partnership
A general criterion is proposed and found to successfully predict the emergence of chirping oscillations of unstable Alfvenic eigenmodes in tokamak plasma experiments. The model includes realistic eigenfunction structure, detailed phase-space dependences of the instability drive, stochastic scattering and the Coulomb drag. The stochastic scattering combines the effects of collisional pitch angle scattering and micro-turbulence spatial diffusion. The latter mechanism is essential to accurately identify the transition between the fixed-frequency mode behavior and rapid chirping in tokamaks and to resolve the disparity with respect to chirping observation in spherical and conventional tokamaks.
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