Excitation of magnetosonic solitons with high power, pulsed CO2 laser in an overdense gas-jet target

The recent availability of long wavelength ($10\mu m$), pulsed $CO_2$ laser has enabled us to use newer targets like gas jet target for overcritical laser plasma interaction. It may simplify high repetition rate operation compared to a solid target since the latter needs to be mechanically replaced or displaced in a very short time. The excitation of magneto-sonic solitons by carrying out the 2D Particle-in-Cell simulation under OSIRIS-4.0 framework in over-dense gas jet targets has been shown with a p-polarised, pulsed $CO_2$ laser with an intensity $I=7 \times 10^{17}W/cm^2$, incident normally to the gas jet target in presence of Kilo-Tesla order of an external magnetic field. Furthermore, it has been shown that such an excitation is independent of the polarisation of the $CO_2$ laser. The solitary structures generated henceforth, are stable for several thousands of plasma periods.The interaction between two magneto-sonic solitons has also been studied by the generation of solitary structures with two $CO_2$ lasers at both ends of the system.