EXACT RESONANCE BROADENING THEORY OF DIFFUSION IN RANDOM ELECTRIC FIELDS
Particle motion in random electric fields is considered on the assumption that orbit stochasticity causes the velocity increments at different times to be independent random events with Gaussian probabilities (Wiener process). The resulting resonance broadening term is substantially different from the one derived by Dupree. The diffusion coefficient D is found to be a function of t/t-d, where f2t-d is the average diffusion time across the resonance region in velocity space. For t/t-d 1 the diffusion is quasilinear. Dupree's high-amplitude case (autocorrelation time trapping time) with D about (f2E2 )9L turns out to be inconsistent with a diffusion process: the particles are lost from the resonance region before diffusion is established.
Bibliographic Reference: WRITE TO MAX-PLANCK-INSTITUT FUER PLASMAPHYSIK, 8046 GARCHING BEI MUENCHEN (GERMANY) MENTIONING REPORT IPP 6/267, 1987
Record Number: 1989126058200 / Last updated on: 1989-03-01
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