Particle dynamics in chirped-frequency fluctations

C. T. Hsu; C. Z. Cheng; P. Helander; D. J. Sigmar; R. White

doi:10.1103/PhysRevLett.72.2503

Particle dynamics in chirped-frequency fluctations

C. T. Hsu, C. Z. Cheng, P. Helander, D. J. Sigmar, R. White

Institute of Space and Plasma Sciences

Research output: Contribution to journal › Article › peer-review

36 Citations (Scopus)

Abstract

Hamiltonian systems describing particle motion in a wave with time-dependent (chirped) frequency are studied. The wave is found to form a single-node separatrix (bucket) moving in the phase space at a rate proportional to that of the frequency change. Particles trapped inside the bucket undergo convection, while untrapped particles colliding with the bucket get a resonant kick, in phase space. In toroidal systems, these effects can result in a large radial convective flux roughly proportional to the size of the bucket and the frequency chirping. Possible applications of this novel mechanism to tokamak plasmas are discussed.

Original language	English
Pages (from-to)	2503-2507
Number of pages	5
Journal	Physical review letters
Volume	72
Issue number	16
DOIs	https://doi.org/10.1103/PhysRevLett.72.2503
Publication status	Published - 1994

All Science Journal Classification (ASJC) codes

Physics and Astronomy(all)

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10.1103/PhysRevLett.72.2503

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