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Reversal of the Parallel Drift Frequency in Anomalous Transport of Impurity Ions
Shaokang Xu1,2, S Maeyama2,3, T-H Watanabe2
1Southwestern Institute of Physics, P.O. Box 432, Chengdu 610041, People's Republic of China.
Abstract:
It is found that, in the studies of heavy ion transport with gyrokinetic simulations, the ion parallel drift frequency can reverse sign in velocity space when the amplitude variation of the electrostatic potential fluctuation is strong along the magnetic field line. As a result, the particle transport related to the parallel dynamics is strongly enhanced. It is noted that, while parallel gradient of the fluctuation amplitude can be instigated by a large magnetic shear or safety factor in a tokamak, the generic mechanism is independent of its cause, which suggests broader applications to kinetic plasma problems. Some relevant topics are briefly addressed in the end.
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