ON THE LIMITATIONS OF CONVENTIONAL NORMAL MODE ANALYSIS IN NORMAL MODE ANALYSIS IN KINETIC THEORY
Kinetic theory has to be applied to a plasma when its particles make excursions which cannot be neglected as compared to the characteristic macroscopic dimensions of the equilibrium state and of existing perturbations. The excursions are determined by the Debye distance, the Larmor radius, and the mean free path. The simplest problem of large particle excursions originates from the classical case of electron oscillations in an unmagnetized plasma, where only the Debye length determines the magnitude of the excursions. In this paper the large Debye distance (LDD) effects in such a plasma are studied, with the special purpose of investigating the limitations of conventional normal mode analysis in which the perturbations are assumed to have a time dependence of the form exp(iomegat). Here omega is a velocity-independent, complex frequency which is treated as a constant parameter. It is shown that such an approach can be used in the MHD-like limit of small Debye distances, but becomes irrelevant in a description of LDD effects. These conclusions have been drawn from the special case of LDD effects, but they should also apply to a much larger class of plasma phenomena, including those of large Larmor radius (LLR) effects.
Bibliographic Reference: REPORT TRITA-PFU13-87, AVAILABILITY: THE ROYAL INSTITUTE OF TECHNOLOGY, STOCKHOLM
Record Number: 1989126086200 / Last updated on: 1989-05-01
Available languages: en