Xu S, Maeyama S, Watanabe TH, Gürcan ÖD. Reversal of the Parallel Drift Frequency in Anomalous Transport of Impurity Ions.
PHYSICAL REVIEW LETTERS 2024;
132:105101. [PMID:
38518327 DOI:
10.1103/physrevlett.132.105101]
[Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/18/2023] [Accepted: 02/02/2024] [Indexed: 03/24/2024]
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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