Two species drag/diffusion model for energetic particle driven modes

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

doi:10.7910/DVN/EJW3KO

Title: Two species drag/diffusion model for energetic particle driven modes

Abstract

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. The model also suggests an explanation for the recent observations on the TJ-II stellarator, where Alfv'en Eigenmodes transition between steady state and bursting as the magnetic configuration varied.

Authors:: Aslanyan, V.; Sharapov, S. E.; Spong, D. A.; Porkolab, M.

Publication Date:: 2018-12-18

DOE Contract Number:: FG02-99ER54563

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

Sponsoring Org.:: USDOE Office of Science (SC), Fusion Energy Sciences (FES)

Subject:: 70 PLASMA PHYSICS AND FUSION TECHNOLOGY

OSTI Identifier:: 1880527

DOI:: https://doi.org/10.7910/DVN/EJW3KO

Citation Formats


                    Aslanyan, V., Sharapov, S. E., Spong, D. A., and Porkolab, M. Two species drag/diffusion model for energetic particle driven modes.  United States: N. p., 2018. 
        Web.  doi:10.7910/DVN/EJW3KO.

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                    Aslanyan, V., Sharapov, S. E., Spong, D. A., & Porkolab, M. Two species drag/diffusion model for energetic particle driven modes.  United States.  doi:https://doi.org/10.7910/DVN/EJW3KO

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                    Aslanyan, V., Sharapov, S. E., Spong, D. A., and Porkolab, M. 2018.  
"Two species drag/diffusion model for energetic particle driven modes".  United States.  doi:https://doi.org/10.7910/DVN/EJW3KO.  https://www.osti.gov/servlets/purl/1880527. Pub date:Tue Dec 18 00:00:00 EST 2018

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@article{osti_1880527,

  title        = {Two species drag/diffusion model for energetic particle driven modes},

  author       = {Aslanyan, V. and Sharapov, S. E. and Spong, D. A. and Porkolab, M.},

  abstractNote = {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. The model also suggests an explanation for the recent observations on the TJ-II stellarator, where Alfv'en Eigenmodes transition between steady state and bursting as the magnetic configuration varied.},

  doi          = {10.7910/DVN/EJW3KO},

  journal      = {},

  number       = ,

  volume       = ,

  place        = {United States},

  year         = {2018},

  month        = {12}

}

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