Resonance assisted enhanced electron acceleration in the presence of self-generated magnetic fields due to circularly polarized laser in plasma

Resonance assisted electron acceleration is analyzed in plasma under combined effect of circularly polarized laser fields and self-generated azimuthal and axial magnetic fields. The azimuthal magnetic field generates the pinching effect and the axial magnetic field assists the collimation of electrons, resulting in high quality relativistic energetic electron beam. The resonance arises between the electron and laser electric field for the favourable values of magnetic field and the electron acquires significantly higher energies at this resonance point. The resonance conditions required for effective exchange of laser energy to electron are calculated. Variation of electron energy with the laser initial intensity, initial spot size is discussed in the presence of azimuthal and axial magnetic fields.