Acceleration of Particles by the Fields of Wave Packets

Abstract

The dynamics of particles in the field of a wave packet excited in a plasma is considered. The conditions are found under which such dynamics is regular, and when it becomes chaotic. It was found that the well-known (phenomenological) criterion for the emergence of dynamic chaos − the criterion for overlapping Chirikov nonlinear resonances − requires careful use.

Laser electron acceleration on curved surfaces

“…The acceleration takes place for the electrons which are injected into the laser field with the apporpriate initial phase. Various mechanisms of electron injection have been discussed in the literature: applied magnetic or electric fields [25][26][27][28][29], colliding laser pulses [30][31][32][33][34], superposition of traveling transverse and longitudinal waves [35] or a resonant excitation of surface plasma waves on a periodic surface structure [16,36]. Here, spontaneous magnetization may boost electron acceleration if it exceeds certain threshold value, similarly to the results in Refs.…”

“…Here, spontaneous magnetization may boost electron acceleration if it exceeds certain threshold value, similarly to the results in Refs. [26,27]. To unravel the injection mechanism, we performed a separate 3D modeling of the motion of test electrons in the given laser field with imposed constant magnetic field, with geometrical constraints simulating the target boundary.…”

Features of New Cyclotron Resonances, as Well as Conditions for Resonant Acceleration of Charged Particles in a Vacuum Without a Magnetic Field

“…The main feature of regimes with intermittency is the appearance of higher moments, which turn out to be larger than the lower moments [7]. Some features and details of this regime are described in [8].…”