Effect of axial magnetic field on axicon laser-induced electron acceleration

•The influence of axial magnetic field on electron acceleration is noticed.•Observe about 3.34 GeV electron energy in the presence of axial magnetic field.•Optimization of axicon laser parameters for enhanced electron acceleration.•Sensitiveness of axial magnetic field on electron acceleration.

Radially polarized axicon Gaussian laser-induced electron acceleration has been studied under the influence of axial magnetic field. Employing an axicon is a significant method to generate a focused and diffraction free radially polarized laser beam. We have investigated direct electron acceleration in vacuum by employing a relativistic single particle simulation. It is observed that the net electron energy gain from the axicon Gaussian radially polarized laser beam can be enhanced under the influence of time varying axial magnetic field. This additional effect of the magnetic field reveals the fact that multi GeV energy gain can be achieved without the use of petawatt power lasers. Effect of laser initial intensity, initial spot size, initial phase, pulse duration and initial energy are taken into consideration for efficient electron acceleration up to GeV energies.