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STUDY OF LOW FREQUENCY PLASMA WAVE INSTABILITY IN BEAM PLASMA DISCHARGE

Zhen Li

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Abstract

The low frequency plasma wave instability caused by interaction of plasma with electron beam injected along magnetic field is studied using a nonneutral cold plasma model.Numerical results show that in beam plasma discharges,the oscillation frequency and growth rate increace with electron beam density and with 1 for fixed beam currents.For l=1,the frequency has the same order of magnitude as the ion cyclotron frequency.For l=3,the osillation frequency does not change with kz the frequency and growth rate are equal to that of the lower hybrid oscillation by order of magnitude and its properties are consistent with the lower hybrid drift instability.Our results are in good agreement with experiments.

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What this paper is about

The low frequency plasma wave instability caused by interaction of plasma with electron beam injected along magnetic field is studied using a nonneutral cold plasma model.Numerical results show that in beam plasma discharges,the oscillation frequency and growth rate increace with electron beam density and with 1 for fixed beam currents.For l=1,the frequency has the same order of magnitude as the ion cyclotron frequency.For l=3,the osillation frequency does not change with kz the frequency and growth rate are equal to that of the lower hybrid oscillation by order of magnitude and its properties are consistent with the lower hybrid drift instability.Our results are in good agreement with experiments.

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Available abstract

The low frequency plasma wave instability caused by interaction of plasma with electron beam injected along magnetic field is studied using a nonneutral cold plasma model.Numerical results show that in beam plasma discharges,the oscillation frequency and growth rate increace with electron beam density and with 1 for fixed beam currents.For l=1,the frequency has the same order of magnitude as the ion cyclotron frequency.For l=3,the osillation frequency does not change with kz the frequency and growth rate are equal to that of the lower hybrid oscillation by order of magnitude and its properties are consistent with the lower hybrid drift instability.Our results are in good agreement with experiments.

Key concepts: Lower hybrid oscillation, Instability, Upper hybrid oscillation, Plasma, Plasma oscillation, Oscillation (cell signaling), Atomic physics, Two-stream instability

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