Electron beam acceleration and potential formation induced by the Compton scattering of extraordinary waves

Abstract

It has been proved theoretically that high-energy or relativistic electron beam acceleration along and across a magnetic field and an electric field transverse to the magnetic field are induced by Compton scattering of almost perpendicularly propagating extraordinary waves.

Charged particle acceleration by electron Bernstein wave in a plasma channel

“…Prasad et al (2009) studied the effect of an axial magnetic field and ion space charge on laser beat wave acceleration and surfatron acceleration of electrons. Sugaya (2004) studied the acceleration of electrons along and across a magnetic field via nonlinear electron Landau damping and cyclotron damping of almost perpendicularly propagating extraordinary waves, and the generation of an electric field transverse to the magnetic field. Oieroset et al (2002) observed energetic particles inside a magnetic reconnection diffusion.…”

Relativistic electron beam acceleration by Compton scattering of extraordinary waves

“…This nonlinear phenomenon is one of the fundamental mechanisms for energy and momentum transfers between waves and particles, and has received a great deal of interest in theoretical [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15] and experimental research. [16][17][18][19][20][21] Nonlinear scattering of intense electromagnetic and electrostatic waves in laser fusion, tokamak, ionospheric modification experiments, and pulsar electrodynamics is related to kinetic effects such as plasma heating and acceleration and transport phenomena, and should be studied on the basis of the general and exact theory, including the relativistic effects.…”

“…[13][14][15][22][23][24][25][26][27][28] These transport equations are provided by the velocity-space diffusion or momentum-space diffusion equation derived from the nonrelativistic or relativistic Vlasov-Maxwell equations. This cross-field particle acceleration and transport can explain the fluctuation-induced particle transport, the electric potential formation, and the perpendicular ion acceleration in fusion and space plasmas.…”

“…Here, ce0 is the nonrelativistic electron cyclotron frequency. In addition, it has been shown numerically that the Compton scattering induced by the nonlinear electron Landau 10,11,14 and cyclotron 14 damping of extraordinary waves can accelerate the high-energy or relativistic electron beam efficiently; the former satisfies the resonance condition of m = 0 and the latter satisfies that of m = 1. It was also clarified that the electron beam acceleration is caused via the parallel ponderomotive force of the wave electric field when the wave frequency is slightly lower than the upper-hybrid frequency, and is caused via the nonlinear v ϫ B Lorentz force when the wave frequency exceeds the right-hand cutoff frequency.…”

“…They show that two electromagnetic waves can accelerate and decelerate particles strongly in the kЉ direction ͑kЉ = k − kЈ͒. Simultaneously, an intense cross-field electric field E 0 = B 0 ϫ v d / c is created via the dynamo effect owing to the cross-field particle drift to satisfy the generalized Ohm's law, [13][14][15][22][23][24][25][26][27][28] which means that the cross-field particle drift is identical to the E ϫ B drift, as proved previously. Using the obtained relativistic transport equations, the numerical analysis of the relativistic electron beam acceleration by the Compton scattering of extraordinary waves was performed.…”