Abstract
Generation of radiation by laser pulses in uniform plasma is generally minimal. However, if one considers propagation in corrugated plasma channels, the condition for radiation generation can be met due to the inhomogeneity of the plasma channel and the presence of guided waves with subluminal phase velocities. For establishing a large amplitude plasma wave driven by moderate-power laser, one has to implement a distributed-feedback structure into the plasma (Plasma Wave Oscillator) with the feedback matching the plasma resonance. In this note the theoretical analysis for plasma waves driven by moderate-power laser for corrugated waveguide filled with pre-ionized hydrogen plasma has been developed. The growth of amplitude of plasma waves in corrugated structure, coupled to the laser and sideband fields has been investigated. The four coupled equations corresponding to laser field, sideband field and forward and backward plasma waves can be numerically solved for various parameters of the laser field, plasma density, and corrugated structure to arrive at experimental design of the Plasma Wave Oscillator, which may be used for the generation of radiation and particle acceleration.
Highlights
IntroductionThe use of plasmas in high power microwave (HPM) devices has been actively researched
In recent years, the use of plasmas in high power microwave (HPM) devices has been actively researched
The four coupled equations corresponding to laser field, sideband field and forward and backward plasma waves can be numerically solved for various parameters of the laser field, plasma density, and corrugated structure to arrive at experimental design of the Plasma Wave Oscillator, which may be used for the generation of radiation and particle acceleration
Summary
The use of plasmas in high power microwave (HPM) devices has been actively researched. The development of corrugated slow-wave plasma guiding structures with application to quasiphase-matched direct laser acceleration of charged particles is reported by York et al [11] These structures support guided propagation at intensities up to 2 × 1017 W/cm, limited at present by our current laser energy and side leakage. A laser beam, i.e. a transverse electromagnetic wave, propagating through an unmagnetized, pre-ionized underdense hydrogen plasma (frequency l of incident light > plasma frequency p ) This incident laser beam will reflect off any electron density fluctuation, in particular perturbations related to electron plasma waves. This density variation and the dielectric modulation induces distributed feedback (DFB), which in turn influences the wave propagation and the plasma waves driven by laser beam
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