Critical wave spectra for stochastic heating of a magnetized plasma

Journal Article · Sun Jul 01 04:00:00 EDT 1990 · Physics of Fluids B; (USA)

DOI:https://doi.org/10.1063/1.859480· OSTI ID:6745816

Deeskow, P; Elsaesser, K; Jestczemski, F ^[1]

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1. Institut fuer Theoretische Physik, Ruhr-Universitdt, D-4630 Bochum 1 (West Germany)

Stochasticity of particles in a magnetized plasma as a result of many waves with common frequency {omega} and different wave vectors {bold k} is examined. A critical potential amplitude {Phi}{sub {ital c}}({ital k})={epsilon}{sub {ital c}}/{ital k}{sub {parallel}}{sup 4} is verified with the following property: Effective heating along the magnetic field {bold B}{sub 0} by small-amplitude waves is only possible in the velocity interval ({omega}/{ital k}{sub max}) {le}{ital v}{sub {parallel}} {le}({omega}/{ital k}{sub min}), where {ital k}{sub min}, {ital k}{sub max} denote the interval for {ital k}{sub {parallel}} (parallel to {bold B}{sub 0}) in which {vert bar}{Phi}({ital k}){vert bar}{ge}{vert bar}{Phi}{sub {ital c}}({ital k}){vert bar}. Heating perpendicular to {bold B}{sub 0} by circularly polarized waves with a Fourier spectrum peaked around a perpendicular wave vector {ital k}{sub {perpendicular}} is strongly inhibited by the presence of an adiabatic invariant, but these barriers can be overcome by waves with a sufficiently broad spectrum in {ital k}{sub {perpendicular}}.

• OSTI ID: 6745816
• Journal Information: Physics of Fluids B; (USA), Journal Name: Physics of Fluids B; (USA) Vol. 2:7; ISSN 0899-8221; ISSN PFBPE
• Country of Publication: United States
• Language: English

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DISPERSION RELATIONS
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