High-order harmonic generation in plasma with ultraintense laser and ion beams

In the scope of relativistic quantum theory the high-order harmonic generation (HHG) in underdense plasma with the copropagating ultraintense laser and fast ion beams is considered. It is shown that in the proposed scheme the impeding factor of relativistic magnetic drift of a strong wave is fully eliminated (at the same velocities of the laser and ion beams the laser magnetic field affecting on the ions in plasma exactly is zero), which makes possible the effective generation of huge number of laser harmonics.