Electron diffusion in tokamaks due to electromagnetic fluctuations

Calculations for the stochastic diffusion of electrons in Tokamaks due to a spectrum of electromagnetic drift fluctuations are presented. The parametric dependence of the diffusion coefficient on the amplitude and phase velocity of the spectrum, and the bounce frequency for the electrons is studied....

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Bibliographic Details
Published in:Plasma physics and controlled fusion 1987-07, Vol.29 (7), p.901-918
Main Authors: Horton, W, Choi, D -I, Yushmanov, P N, Parail, V V
Format: Article
Language:English
Subjects:
Exact sciences and technology
Magnetic confinement and equilibrium
Physics
Physics of gases, plasmas and electric discharges
Physics of plasmas and electric discharges
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Summary:Calculations for the stochastic diffusion of electrons in Tokamaks due to a spectrum of electromagnetic drift fluctuations are presented. The parametric dependence of the diffusion coefficient on the amplitude and phase velocity of the spectrum, and the bounce frequency for the electrons is studied. The wavenumber spectrum is taken to be a low order (5 x 5) randomly-phased, isotropic, monotonic spectrum extending from k sub( perpendicular min) approximately equals omega sub(ci)/c sub(s) to k sub( perpendicular max) approximately equals 3 omega sub(pe)/c with different power laws of decrease phi sub(k) approximately equals phi sub(1)/k super(m), 1 less than or equal to m less than or equal to 3. A nonlinear Ohm's law is derived for the self-consistent relation between the electrostatic and parallel vector potentials. The parallel structure of the fluctuations is taken to be such that k sub( parallel )@)un super(l) upsilon sub(e) < omega sub(k) due to the nonlinear perpendicular motion of the electrons described in the nonlinear Ohm's law.
ISSN:0741-3335
1361-6587
DOI:10.1088/0741-3335/29/7/008