Affiliation:
1. Theoretical Division, Los Alamos National Laboratory , Los Alamos, New Mexico 87545, USA
Abstract
For plasma velocity space instabilities driven by particle distributions significantly deviated from a Maxwellian, weak collisions can damp the instabilities by an amount that is significantly beyond the collisional rate itself. This is attributed to the dual role of collisions that tend to relax the plasma distribution toward a Maxwellian and to suppress the linearly perturbed distribution function. The former effect can dominate in cases where the unstable non-Maxwellian distribution is driven by collisionless transport on a timescale much shorter than that of collisions, and the growth rate of the ideal instability has a sensitive dependence on the distribution function. The whistler instability driven by electrostatically trapped electrons is used as an example to elucidate such a strong collisional damping effect of plasma velocity space instabilities, which is confirmed by first-principles kinetic simulations.
Funder
Fusion Energy Sciences
Advanced Scientific Computing Research
Reference39 articles.
1. Waves in a plasma in a magnetic field;Phys. Rev.,1958
2. Wave-particle interaction in astrophysical plasma,2013
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