The effect of external magnetic field on the density distributions and electromagnetic fields in the interaction of high-intensity short laser pulse with collisionless underdense plasma

Abstract

Laser absorption in the interaction between ultra-intense femtosecond laser and solid density plasma is studied theoretically here in the intensity range Ik 2 ' 10 14 À10 16 W cm À2 lm 2 . The collisionless effect is found to be significant when the incident laser intensity is less than 10 16 W cm À2 lm 2 . In the current work, the propagation of a high-frequency electromagnetic wave, for underdense collisionless plasma in the presence of an external magnetic field is investigated. When a constant magnetic field parallel to the laser pulse propagation direction is applied, the electrons rotate along the magnetic field lines and generate the electromagnetic part in the wake with a nonzero group velocity. Here, by considering the ponderomotive force in attendance of the external magnetic field and assuming the isothermal collisionless plasma, the nonlinear permittivity of the plasma medium is obtained and the equation of electromagnetic wave propagation in plasma is solved. Here, by considering the effect of the ponderomotive force in isothermal collisionless magnetized plasma, it is shown that by increasing the laser pulse intensity, the electrons density profile leads to steepening and the electron bunches of plasma become narrower. Moreover, it is found that the wavelength of electric and magnetic field oscillations increases by increasing the external magnetic field and the density distribution of electrons also grows in comparison to the unmagnetized collisionless plasma.

Characterization of Magnetized-Plasma System Induced by Laser

“…The significant effect that an external magnetic field has on the plasma number density and the relation that this effect has with the other parameters, the plasma frequency values have a tendency to behave in the same manner as n e , which is to say that they were increased in the magnetic field. This is due to the plasma number density's obvious confinement impact by the external field, which is connected to other plasma properties [57]. These two components had a direct impact on the considerable increase in T e , D, and ND, which both rose T e [58].…”

Relativistic Laser-Plasma Interactions. Moving Solitary Waves in Plasma Channels and the Kinetic Dispersion Relation of Cherenkov Radiation

“…The nonlinear interaction of plasmas with high intensity lasers is of great current interest [1][2][3][4][5][6][7]. The possibility of reaching the extreme power levels with such setups is one of the promising aspects of laser-plasma systems [8] and holds the potential of overcoming the laser intensity limit ℎ ≈ 10 25 W/cm 2 [9].…”