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Magnetohydrodynamic equations for plasmas with finite-Larmor-radius effects

Published online by Cambridge University Press:  01 August 1998

IGOR O. POGUTSE
Affiliation:
Department of Physics and Engineering Physics, University of Saskatchewan, Saskatoon, Saskatoon, Canada S7N 5E2
ANDREI I. SMOLYAKOV
Affiliation:
Department of Physics and Engineering Physics, University of Saskatchewan, Saskatoon, Saskatoon, Canada S7N 5E2
AKIRA HIROSE
Affiliation:
Department of Physics and Engineering Physics, University of Saskatchewan, Saskatoon, Saskatoon, Canada S7N 5E2

Abstract

It is shown that the truncation of the infinite hierarchy of fluid equations obtained as moments of the Vlasov kinetic equation leads to a system of nonlinear equations that describe finite-Larmor-radius effects with good accuracy. Inertial terms in the momentum balance, viscosity and heat-flux evolution equations are crucial for a uniform description of the plasma response with an arbitrary Larmor radius. In the low-frequency ordering, the obtained equations are simplified by an expansion in the parameter 1/B, where B is the equilibrium magnetic field. The results of the second-order [Oscr ](1/B2) and the fourth-order [Oscr ](1/B4) closures are compared. It is shown that the accuracy of the description improves for higher-order closures.

Type
Research Article
Copyright
© 1998 Cambridge University Press

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