Temperature-dependent Saturation of Weibel-type Instabilities in Counter-streaming Plasmas
| Autor: | Skoutnev, V., Hakim, A., Juno, J., TenBarge, J. M. |
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| Rok vydání: | 2019 |
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| Zdroj: | ApJL 872 L28 (2019) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.3847/2041-8213/ab0556 |
| Popis: | 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. Comment: Accepted for publication in ApJL. 6 pages, 5 figures |
| Databáze: | arXiv |
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