Regimes of enhanced electromagnetic emission in beam-plasma interactions

The ways to improve the efficiency of electromagnetic waves generation in laboratory experiments with high-current relativistic electron beams injected into a magnetized plasma are discussed. It is known that such a beam can lose, in a plasma, a significant part of its energy by exciting a high leve...

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Bibliographic Details
Published in:Physics of plasmas 2015-11, Vol.22 (11)
Main Authors: Timofeev, I. V., Annenkov, V. V., Arzhannikov, A. V.
Format: Article
Language:English
Subjects:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
BEAM-PLASMA SYSTEMS
ELECTROMAGNETIC RADIATION
ELECTRON BEAMS
ENERGY BALANCE
HEATING
NONLINEAR PROBLEMS
Plasma
PLASMA DENSITY
Plasma interactions
Plasma oscillations
Plasma physics
Plasma turbulence
PLASMA WAVES
Relativism
Relativistic effects
Relativistic electron beams
RELATIVISTIC RANGE
TURBULENCE
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Summary:The ways to improve the efficiency of electromagnetic waves generation in laboratory experiments with high-current relativistic electron beams injected into a magnetized plasma are discussed. It is known that such a beam can lose, in a plasma, a significant part of its energy by exciting a high level of turbulence and heating plasma electrons. Beam-excited plasma oscillations may simultaneously participate in nonlinear processes resulting in a fundamental and second harmonic emissions. It is obvious, however, that in the developed plasma turbulence the role of these emissions in the total energy balance is always negligible. In this paper, we investigate whether electromagnetic radiation generated in the beam-plasma system can be sufficiently enhanced by the direct linear conversion of resonant beam-driven modes into electromagnetic ones on preformed regular inhomogeneities of plasma density. Due to the high power of relativistic electron beams, the mechanism discussed may become the basis for the generator of powerful sub-terahertz radiation.
ISSN:1070-664X
1089-7674
DOI:10.1063/1.4935890