Advances in gyrokinetic fluctuation theory: The gyrokinetic fluctuation–dissipation theorem and dielectric function[ATOTHER]@f|[/ATOTHER]

Krommes, John A.
July 1993
Physics of Fluids B: Plasma Physics;Jul93, Vol. 5 Issue 7, p2405
Academic Journal
Thermal-equilibrium fluctuation spectra of finite-β gyrokinetic (GK) plasmas are calculated by means of a GK fluctuation-dissipation theorem. Agreement is found with the earlier heuristic electrostatic calculations of Krommes et al. [Phys. Fluids 29, 2421 (1986)]. The formulas are interpreted in terms of the concept of a GK vacuum, whose large dielectric permittivity and magnetic permeability embody the shielding effects of the polarization drift and the parallel electric field. The finite-β quasimode action density N[sub k], is calculated. This is used to interpret the result of a formal resonance integration over the normal modes in terms of the equipartition laws ω[sub k]N[sub k] = T/2.


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