Comparison of collisionless macroscopic models and application to the ion-electron instability

Citation
E. Ahedo et V. Lapuerta, Comparison of collisionless macroscopic models and application to the ion-electron instability, PHYS PLASMA, 8(9), 2001, pp. 3873-3878
Citations number
11
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Physics
Journal title
PHYSICS OF PLASMAS
ISSN journal
1070-664X → ACNP
Volume
8
Issue
9
Year of publication
2001
Pages
3873 - 3878
Database
ISI
SICI code
1070-664X(200109)8:9<3873:COCMMA>2.0.ZU;2-G
Abstract
In a first part, different macroscopic models of linear Landau damping are compared using a concise one-dimensional (1-D) collisionless formulation. T he three-moment model of Chang and Callen (CC) [Phys. Fluids B 4, 1167 (199 2)] with two closure relations (complex in the Fourier space) for the visco us stress and the heat conduction is found to be equivalent to the two-mome nt model of Stubbe-Sukhorukov (SS) [Phys. Plasmas 6, 2976 (1999)], which us es a single (complex) closure relation for the pressure. The comparison of the respective closure relations favors clearly the SS pressure law, which associates an anomalous resistivity to the Landau damping. In a second part , a macroscopic interpretation, with the SS model, of the ion-electron inst ability shows its resistive character for low and intermediate drift veloci ties, and the transition to the reactive Buneman limit. The pressure law fo r the electrons is found to verify a simple law, whereas approximate laws a re discussed for the ion pressure. These laws are used to close a macroscop ic model for stability analyses of nonhomogeneous plasma structures, where SS and CC models are not applicable easily. (C) 2001 American Institute of Physics.