Nonlinear finite-Larmor-radius effects in reduced fluid models
- Department of Chemistry and Physics, Saint Michael's College, Colchester, Vermont 05439 (United States)
- Department of Physics and Astronomy, Dartmouth College, Hanover, New Hampshire 03755 (United States)
- Thayer School of Engineering, Dartmouth College, Hanover, New Hampshire 03755 (United States)
The polarization magnetization effects associated with the dynamical reduction leading to the nonlinear gyrokinetic Vlasov-Maxwell equations are shown to introduce nonlinear finite-Larmor-radius (FLR) effects into a set of nonlinear reduced-fluid equations previously derived by the Lagrangian variational method [A. J. Brizard, Phys. Plasmas 12, 092302 (2005)]. These intrinsically nonlinear FLR effects, which are associated with the transformation from guiding-center phase-space dynamics to gyrocenter phase-space dynamics, are different from the standard FLR corrections associated with the transformation from particle to guiding-center phase-space dynamics. We also present the linear dispersion relation results from a nonlinear simulation code using these reduced-fluid equations. The simulation results (in both straight dipole geometries) demonstrate that the equations describe the coupled dynamics of Alfven sound waves and that the total simulation energy is conserved.
- OSTI ID:
- 21120499
- Journal Information:
- Physics of Plasmas, Vol. 15, Issue 8; Other Information: DOI: 10.1063/1.2965827; (c) 2008 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 1070-664X
- Country of Publication:
- United States
- Language:
- English
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