Highly efficient electromagnetic emission during 100 keV electron beam relaxation in a thin magnetized plasma

Abstract

In this paper, electromagnetic emissions produced by a beam-plasma system are investigated using particle-in-cell simulations for the particular case when the typical transverse size of both 100 keV electron beam and produced plasma channel is comparable to the radiation wavelength. The interest in this regime of beam-plasma interaction is associated with highly efficient generation of electromagnetic waves near the plasma frequency harmonics that has been recently observed in laboratory experiments on the GOL-3 mirror trap. It has been found that the radiation power only from the vicinity of the doubled plasma frequency in these experiments can reach 1% of the total beam power. Subsequent theoretical and simulation studies have shown that the most likely candidate for explaining such efficient generation of electromagnetic radiation is the mechanism of a beam-driven plasma antenna based on the conversion of the most unstable plasma oscillations on a longitudinal density modulation of plasma ions. In this paper, we investigate how effectively this mechanism can work in a real experiment at the GOL-3 facility, when a thin sub-relativistic electron beam gets a large angular spread due to compression by a magnetic field, and the gas into which it is injected has macroscopic density gradients.

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Cited by in corpus (5)

• Electromagnetic Emission Produced by Three-wave Interactions in a Plasma with Continiously Injected Counterstreaming Electron Beams
• The effects of density inhomogeneities on the radio wave emission in electron beam plasmas
• Wave emission of non-thermal electron beams generated by magnetic reconnection
• Electromagnetic emission due to nonlinear interaction of laser wakefields colliding in plasma at an oblique angle
• Numerical simulations of a continuously injected relativistic electron beam relaxation into a plasma with large-scale density gradients