Vlasov simulations of electron-ion collision effects on damping of electron plasma waves

Banks, J. W.; Brunner, S.; Berger, R. L.; Tran, T. M.

doi:10.1063/1.4943194

Vlasov simulations of electron-ion collision effects on damping of electron plasma waves

Journal Article · Wed Mar 09 00:00:00 EST 2016 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.4943194· OSTI ID:1829015

Banks, J. W. ^[1]; Brunner, S. ^[2]; Berger, R. L. ^[3]; Tran, T. M. ^[2]

Rensselaer Polytechnic Inst., Troy, NY (United States)
Ecole Polytechnique Federale Lausanne (Switzerland)
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)

Collisional effects can play an essential role in the dynamics of plasma waves by setting a minimum damping rate and by interfering with wave-particle resonances. Kinetic simulations of the effects of electron-ion pitch angle scattering on Electron Plasma Waves (EPWs) are presented here. In particular, the effects of such collisions on the frequency and damping of small-amplitude EPWs for a range of collision rates and wave phase velocities are computed and compared with theory. Both the Vlasov simulations and linear kinetic theory find the direct contribution of electron-ion collisions to wave damping significantly reduced from that obtained through linearized fluid theory. To our knowledge, this simple result has not been published before. Here, simulations have been carried out using a grid-based (Vlasov) approach, based on a high-order conservative finite difference method for discretizing the Fokker-Planck equation describing the evolution of the electron distribution function. Details of the implementation of the collision operator within this framework are presented. Such a grid-based approach, which is not subject to numerical noise, is of particular interest for the accurate measurements of the wave damping rates.

View Accepted Manuscript (DOE)

Research Organization:: Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)

Sponsoring Organization:: USDOE; USDOE Laboratory Directed Research and Development (LDRD) Program; USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: AC52-07NA27344

OSTI ID:: 1829015

Alternate ID(s):: OSTI ID: 1349320
OSTI ID: 22599015

Report Number(s):: LLNL-JRNL--669228; 790422

Journal Information:: Physics of Plasmas, Journal Name: Physics of Plasmas Journal Issue: 3 Vol. 23; ISSN 1070-664X

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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Linear Theory of Electron-Plasma Waves at Arbitrary Collisionality Jorge, R.; Ricci, P.; Brunner, S. arXiv https://doi.org/10.48550/arxiv.1811.12855	text	January 2018

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