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Validity of the weak-coupling approximation in strong plasma turbulence

Published online by Cambridge University Press:  13 March 2009

P. Rolland
P. Rolland
Affiliation:
Association Euratom-CEA, Département de Physique du Plasma et de la Fusion Controlée, Service Ign Centre d'Etudes Nucléaires, BP 85 Centre de tri 38041, Grenoble Cedex
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Abstract

The weak-coupling approximation takes stochastic perturbations of orbits into account, but neglects a part of mode coupling. This approximation, which is non-trivial, is discussed here. Its domain of validity appears to be T E ≪Tt provided the turbulence is strong enough so that γNL- γL ñ γL. If γL ≪ a stronger condition is required. It is shown that the growth rate γNL can be calculated either from the nonlinear dispersion equation εNL =0, or from the energy equation, provided thepropagator conserves particles. Dupree's propagator U does not do this; but it gives a correct approximation of γNL, provided Δv≫vth.

Type
Research Article
Information
Journal of Plasma Physics , Volume 12 , Issue 3 , December 1974 , pp. 455 - 465
Copyright
Copyright © Cambridge University Press 1974

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References

REFERENCES

Dupree, T. H. 1966 Phys. Fluids, 9, 1773.Google Scholar
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