Abstract
The nonlinear threshold phenomena of particle reflection and capture of electrons in the induced Compton process that have previously been revealed in the case of plane monochromatic counterpropagating waves, take place also with the actual nonplane laser pulses of ultrashort duration and lead to particle acceleration. In contrast to analogous phenomena in the induced Cherenkov and undulator processes, the Compton reflection-capture mechanism with laser pulses of relativistic intensities practically may be realized for arbitrary initial energies of particles. The acceleration effect for particles initially in rest is explored numerically, taking into account the significance of this case connected with the relativistic electron bunches of high densities, which currently may be realized by relativistic lasers on the ultrathin solid foils where the electrons initially are almost in rest.
Highlights
INTRODUCTIONThe significant advance in laser technology during the recent decade made available the ultrashort superintense laser pulses of relativistic intensities [1,2], which really create new nonlinear channels for diverse laser-particle interactions [3] and determine, in general, the future of laser accelerators [4,5,6,7,8,9] of superhigh energies, including laser-plasma accelerators [10,11,12,13,14,15,16]
In the coherent processes such as Cherenkov, Compton, and undulator ones, the nonlinear threshold phenomena of particle reflection and capture take place, which occur on the shortest interaction lengths, even shorter than a laser wavelength, because of the coherent/threshold feature of the nonlinear resonance in the above critical fields at which the interaction from an effective wave-barrier proceeds [3]
To show the influence of space effects because of nonplane fields of focused ultrapower laser pulses on the nonlinear dynamics of induced Compton process and acceleration effect due to the considered threshold phenomena, we present for comparison the graphics of particle energy dependence on the initial positions at the reflection capture, both by the plane and nonplane-focused laser pulses under the same condition, which are demonstrated in Figs. 5 and 6: for cases !1=!2 1⁄4 10 and !1=!2 1⁄4 2, respectively
Summary
The significant advance in laser technology during the recent decade made available the ultrashort superintense laser pulses of relativistic intensities [1,2], which really create new nonlinear channels for diverse laser-particle interactions [3] and determine, in general, the future of laser accelerators [4,5,6,7,8,9] of superhigh energies, including laser-plasma accelerators [10,11,12,13,14,15,16]. In the coherent processes such as Cherenkov, Compton, and undulator ones, the nonlinear threshold phenomena of particle reflection and capture take place, which occur on the shortest interaction lengths, even shorter than a laser wavelength, because of the coherent/threshold feature of the nonlinear resonance in the above critical fields at which the interaction from an effective wave-barrier proceeds [3]. In the present paper the nonlinear dynamics of charged particle interaction with the strong nonplane counterpropagating laser pulses of finite time-space configurations in vacuum is investigated to find out the influence of finite duration and transverse space sizes of real laser pulses on the reflection-capture phenomena in the induced Compton scattering and, the particle acceleration process
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