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Title: An integral transform technique for kinetic systems with collisions

Abstract

The linearized Vlasov-Poisson system can be exactly solved using the G-transform, an integral transform introduced in Morrison and Pfirsch [Phys. Fluids B 4, 3038–3057 (1992)] and Morrison [Phys. Plasmas 1, 1447 (1994); Transp. Theory Stat. Phys. 29, 397 (2000)] that removes the electric field term, leaving a simple advection equation. We investigate how this integral transform interacts with the Fokker-Planck collision operator. The commutator of this collision operator with the G-transform (the “shielding term”) is shown to be negligible. We exactly solve the advection-diffusion equation without the shielding term. This solution determines when collisions dominate and when advection (i.e., Landau damping) dominates. This integral transform can also be used to simplify gyro-/drift-kinetic equations. We present new gyrofluid equations formed by taking moments of the G-transformed equation. Since many gyro-/drift-kinetic codes use Hermite polynomials as base elements, we include an explicit calculation of their G-transform

Authors:
 [1]; ORCiD logo [2]
  1. Univ. of Texas, Austin, TX (United States). Dept. of Physics and Institute for Fusion Studies
  2. Univ. of Texas, Austin, TX (United States). Dept. of Physics and Inst. for Fusion Studies
Publication Date:
Research Org.:
Univ. of Texas, Austin, TX (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1515033
Alternate Identifier(s):
OSTI ID: 1465620
Grant/Contract Number:  
FG05-80ET53088; FG05-80ET-53088
Resource Type:
Accepted Manuscript
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 25; Journal Issue: 8; Journal ID: ISSN 1070-664X
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY

Citation Formats

Heninger, J. M., and Morrison, P. J. An integral transform technique for kinetic systems with collisions. United States: N. p., 2018. Web. doi:10.1063/1.5046194.
Heninger, J. M., & Morrison, P. J. An integral transform technique for kinetic systems with collisions. United States. https://doi.org/10.1063/1.5046194
Heninger, J. M., and Morrison, P. J. Tue . "An integral transform technique for kinetic systems with collisions". United States. https://doi.org/10.1063/1.5046194. https://www.osti.gov/servlets/purl/1515033.
@article{osti_1515033,
title = {An integral transform technique for kinetic systems with collisions},
author = {Heninger, J. M. and Morrison, P. J.},
abstractNote = {The linearized Vlasov-Poisson system can be exactly solved using the G-transform, an integral transform introduced in Morrison and Pfirsch [Phys. Fluids B 4, 3038–3057 (1992)] and Morrison [Phys. Plasmas 1, 1447 (1994); Transp. Theory Stat. Phys. 29, 397 (2000)] that removes the electric field term, leaving a simple advection equation. We investigate how this integral transform interacts with the Fokker-Planck collision operator. The commutator of this collision operator with the G-transform (the “shielding term”) is shown to be negligible. We exactly solve the advection-diffusion equation without the shielding term. This solution determines when collisions dominate and when advection (i.e., Landau damping) dominates. This integral transform can also be used to simplify gyro-/drift-kinetic equations. We present new gyrofluid equations formed by taking moments of the G-transformed equation. Since many gyro-/drift-kinetic codes use Hermite polynomials as base elements, we include an explicit calculation of their G-transform},
doi = {10.1063/1.5046194},
journal = {Physics of Plasmas},
number = 8,
volume = 25,
place = {United States},
year = {Tue Aug 21 00:00:00 EDT 2018},
month = {Tue Aug 21 00:00:00 EDT 2018}
}

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Works referencing / citing this record:

Analytical solutions for nonlinear plasma waves with time-varying complex frequency
journal, November 2019