Two species drag/diffusion model for energetic particle driven modes

Aslanyan, Valentin; Sharapov, S. E.; Spong, D. A.; Porkolab, M.

doi:10.1063/1.4996123

Two species drag/diffusion model for energetic particle driven modes

Journal Article · Mon Dec 18 23:00:00 EST 2017 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.4996123· OSTI ID:1895306

^[1]; Sharapov, S. E. ^[2]; Spong, D. A. ^[3]; Porkolab, M. ^[4]

Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States); OSTI
Culham Science Centre, Abingdon (United Kingdom)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)

A nonlinear bump-on-tail model for the growth and saturation of energetic particle driven plasma waves has been extended to include two populations of fast particles—one dominated by dynamical friction at the resonance and the other by velocity space diffusion. The resulting temporal evolution of the wave amplitude and frequency depends on the relative weight of the two populations. The two species model is applied to burning plasma with drag-dominated alpha particles and diffusion-dominated ICRH accelerated minority ions, showing the stabilization of bursting modes. Further, the model also suggests an explanation for the recent observations on the TJ-II stellarator, where Alfvén Eigenmodes transition between steady state and bursting as the magnetic configuration varied.

Research Organization:: Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States). Plasma Science and Fusion Center

Sponsoring Organization:: USDOE Office of Science (SC), Fusion Energy Sciences (FES); RCUK Energy Programme

Grant/Contract Number:: FG02-99ER54563

OSTI ID:: 1895306

Alternate ID(s):: OSTI ID: 1414038

Journal Information:: Physics of Plasmas, Journal Name: Physics of Plasmas Journal Issue: 12 Vol. 24; ISSN 1070-664X

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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