Abstract Details
Abstracts
Author: Valentin Skoutnev
Requested Type: Poster
Submitted: 2019-02-24 13:13:22
Co-authors: A. Hakim, J. Juno, J. M. TenBarge
Contact Info:
Princeton University
25 Wilton St
Princeton, 08540
US
Abstract Text:
The Gkeyll project has a strong fusion focus on scrape-off layer turbulence and plasma wall interactions. To illuminate the more general applicability of Gkeyll, this poster focuses on a new result found from a study of the classic problem of saturation of Weibel-type instabilities in the context of laser-driven and astrophysical plasmas. We present the first 2X2V continuum Vlasov-Maxwell simulations of interpenetrating, unmagnetized plasmas to study the competition between two-stream, Oblique, and filamentation modes in the weakly relativistic regime. We find that after nonlinear saturation of the fastest-growing two-stream and Oblique modes, the effective temperature anisotropy, which drives current filament formation via the secular Weibel instability, has a strong dependence on the internal temperature of the counter-streaming plasmas. The effective temperature anisotropy is significantly more reduced in colder than in hotter plasmas, leading to orders of magnitude lower magnetization for colder plasmas. A strong dependence of the energy conversion efficiency of Weibel-type instabilities on internal beam temperature has implications for determining their contribution to the observed magnetization of many astrophysical and laboratory plasmas.
Comments:
