Enhanced self-magnetic field by atomic polarization in partially stripped plasma produced by a short and intense laser pulse

Abstract

The enhancement and redistribution of a self-generated quasistatic magnetic field, due to the presence of the polarization field induced by partially ionized atoms, are analytically revealed when a linearly polarized intense and short pulse laser propagates in a partially stripped plasma with higher density. In particular, the shorter wavelength of the laser pulse can evidently intensify the amplitude of the magnetic field. These enhancement and redistribution of the magnetic field are considered physically as a result of the competition of the electrostatic field (electron-ion separation) associated with the plasma wave, the atomic polarization field, and the pondoromotive potential associated with the laser field. This competition leads to the generation of a positive, large amplitude magnetic field in the zone of the pulse center, which forms a significant difference in partially and fully stripped plasmas. The numerical result shows further that the magnetic field is resonantly modulated by the plasma wave when the pulse length is the integer times the plasma wavelength. This apparently implies that the further enhancement and restructure of the large amplitude self-magnetic field can evidently impede the acceleration and stable transfer of the hot-electron beam.

Intense Cherenkov-type terahertz electromagnetic radiation from ultrafast laser—plasma interaction

“…where e is the electronic charge, n 0 and n are the ambient and disturbed electron densities, respectively, and v is the electron velocity. The normalized electron density within the laser pulse can be derived as [8,9] n n 0…”

“…Using Eq. ( 4) and the hydrodynamic equations, the second order momentum p2 can be presented as [8,9]…”

Propagation of radiation pulses through gas–plasma mixtures

“…These effects are relevant to the construction of laser-driven plasma-based electron accelerators [28]. Hu et al [29] predicted self-generation of a quasi-static magnetic field for short, intense laser pulses.…”

One-dimensional EM solitons in ultrashort intense laser pulse-partially stripped plasmas

“…So, the propagation medium consists of both free and bound electrons in addition to the ions [2][3][4][5][6]. Recent investigation shows that, due to the nonlinear polarization of the partially ionized atoms, the filamentation instability, modulation instability, self-generated magnetic field, Raman-scattering and Brillouin-scattering instabilities in the partially stripped plasmas are much different from those in the fully stripped plasmas [2,3,[6][7][8]. In this Letter, we examine the contribution of the nonlinear polarization to the formation of the laser pulse envelope soliton, which is an important aspect for the propagation and stability of intense laser pulse.…”