Magnetic field dependence of plasma relaxation times
作者:
David Montgomery,
Glenn Joyce,
Leaf Turner,
期刊:
Physics of Fluids(00319171)
(AIP Available online 1974)
卷期:
Volume 17,
issue 12
页码: 2201-2204
ISSN:0031-9171
年代: 1974
DOI:10.1063/1.1694692
出版商: AIP
数据来源: AIP
摘要:
A previously derived Fokker‐Planck collision integral for an electron plasma in a dc magnetic field is examined in the limit in which the Debye length is greater than the thermal gyroradius, which is in turn greater than the mean distance of closest approach. It is demonstrated that the collision integral can be satisfactorily approximated by the classical Landau value (which ignores the presence of a dc magnetic field) if the following replacement is made: In the Coulomb logarithm, the Debye length is replaced by the gyroradius. This induces a fundamental logarithmic dependence on magnetic field in the relaxation times. Numerical comparison of the asymptotic approximations with the previously derived exact results is made, and good agreement is found. The simplification this introduces into the description of collision processes in magnetized plasmas is considerable.
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