Abstract
Laser wakefield excitation in the interaction of femtosecond laser pulse with an underdense thin magnetized plasma slab is studied by one dimensional relativistic Vlasov-Maxwell system of equations. The interaction is modeled by relativistic Vlasov equation in propagation direction of laser pulse and fluid equations in transverse direction. Backward semi-Lagrangian method (BSL) is used for numerical solution of Vlasov equation. Generation of wakefields by a right and left handed circularly polarized (RCP) and (LCP) laser pulses in the interaction with nonmagnetized and magnetized plasma slab are examined and compared. Two directions are considered for external magnetic field, parallel and antiparallel to direction of laser pulse propagation. The results show that applying magnetic field along (opposite to) the propagation direction of RCP (LCP) laser pulse increases amplitude of density steepening and consequently wakefields amplitude, and mean kinetic energy of electrons compared with nonmagnetized plasma. The results are in complete agreement with previous analytical and numerical reports.
Highlights
Because of breakdown limitation in conventional radio frequency accelerators, using alternative methods for charged particle acceleration is of great importance
Experimental [39] and twodimensional simulation [40,41,42] investigations demonstrate that, applying longitudinal external magnetic field of a few tens of tesla significantly enhances particle trapping in the bubble regime of laser wakefield acceleration, which cause to increase of the total charge and maximum energy of the trapped beam
We assume that transverse velocity is not relativistic and is calculated from fluid equations, while longitudinal velocity along laser propagation is relativistic and kinetic features of plasma preserved in this direction
Summary
Because of breakdown limitation in conventional radio frequency accelerators, using alternative methods for charged particle acceleration is of great importance. Experimental [39] and twodimensional simulation [40,41,42] investigations demonstrate that, applying longitudinal external magnetic field of a few tens of tesla significantly enhances particle trapping in the bubble regime of laser wakefield acceleration (due to the suppression of the transverse drift of electrons), which cause to increase of the total charge and maximum energy of the trapped beam. In this paper we use one dimensional relativistic VlasovMaxwell system of equations for studying wakefield generation in the interaction of mildly relativistic circularly polarized laser pulse with a plasma slab in the presence of external longitudinal magnetic field. Electron density fluctuations, time evolution of phase space, electrostatic energy of wakefield, and mean kinetic energy of electrons are investigated in the interaction of right and left-hand circularly polarized (LCP) laser pulses with a magnetized thin plasma slab.
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