How it cramps the flow: three regimes for the saturation of parallel ion-beam instabilities

Abstract

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.

arXiv comment18 pages, 25 figures

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• Hybrid Paricle-in-Cell Simulations of Electromagnetic Coupling and Waves From Streaming Burst Debris
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• Time-dependent treatment of cosmic-ray spectral steepening due to turbulence driving