http://arxiv.org/abs/1805.11220
Motivated by recent advances in laboratory experiments on parallel ion-beam instabilities, we present a theoretical framework for and simulations of their evolution towards shock formation and Fermi acceleration. After reviewing the theory of beam instabilities with a focus on the so-called nonresonant or Bell instability, which we show to be due to the gyromotion of background ions, we contrast the saturation of three parameter regimes: (I) the left-handed “nonresonant” regime, (II) the right-handed beam-gyroresonant regime, (III) the balanced, mixed-turbulence regime.
M. Weidl, D. Winske and C. Niemann
Wed, 30 May 18
40/65
Comments: 18 pages, 25 figures
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