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Laser Acceleration of Charged Particles by Means of a Moving Grating of Plasmoids in High-Frequency Potential Wells

The proposed scheme is based on a moving grating of plasmoids in 3-dimensional HF potential wells (RF traps) which are formed by a two-frequency laser field of cylindrical waves with high indices. The accelerating field of slow waves is excited in this grating by means of a similar additional 2-frequency field. Analytical and computational studies of plasmoid dynamics show that this “combined” scheme can increase the acceleration rate by a factor ∼ 2γa ≫ 1 (doubled Lorentz factor of the grating) with respect to the case of acceleration through the motionless plasmoids grating. For instance, it can provide the rate ∼ 1 MV/λ instead of ∼ 100 kV/λ, λ being the laser wavelength. Focusing properties of the plasmoids grating are discussed.