Community Research and Development Information Service - CORDIS

Abstract

A macroscopic fluid description of a neutral gas or a plasma requires internal binding forces to exist within the fluid. These forces prevent the individual particles from making large excursions by free streaming, i.e. the particles should remain localized within macroscopically small elements of volume. A macroscopic fluid description of a collisionless plasma thus becomes incomplete or even erroneous with respect to the transverse directions of an immersed magnetic field, as soon as the ion Larmor radius is comparable to or larger than the characteristic macroscopic dimensions of the configuration to be considered. The resulting large Larmor radius (LLR) effect is kinetic and differs in its nature from the finite Larmor radius (FLR) effect earlier introduced by Rosenbluth et al. and being expressible in terms of a modified fluid model. The LLR effect is particularly important to high beta plasmas in the interior of which there are zero points of the magnetic field strength. In certain cases this effect leads to strong collisionless kinetic damping of an imposed plasma disturbance, especially at small wave lengths. It is generally expected that several types of compressible, incompressible, electrostatic and electromagnetic plasma disturbances should become more or less affected by such damping.

Additional information

Authors: LEHNERT B ROYAL INSTITUTE OF TECHNOLOGY, STOCKHOLM (SWEDEN), ROYAL INSTITUTE OF TECHNOLOGY, STOCKHOLM (SWEDEN)
Bibliographic Reference: WRITE TO THE DEPARTMENT OF PLASMA PHYSICS AND FUSION RESEARCH, ROYAL INSTITUTE OF TECHNOLOGY, S-100 44 STOCKHOLM 70 (SWEDEN), MENTIONING REPORT TRITA-PFU-84-10, 1984
Follow us on: RSS Facebook Twitter YouTube Managed by the EU Publications Office Top