Abstract
Parallel intense photon (laser, microwave, etc.) beams ω<sub>0</sub>,k<sub>0</sub> and ω<sub>1</sub>,k<sub>1</sub> shone on a plasma with frequency separation equal to the plasma frequency ω<sub>p</sub> is capable of accelerating plasma electrons to high energies in large flux. The photon beat excites through the forward Raman scattering large amplitude plasmons whose phase velocity is equal to (ω<sub0</sub>-ω<sub>1</sub>)/(k<sub>0</sub>-k<sub>1</sub>), close to c in an underdense plasma. The plasmon electrostatic fields trap electrons and carry them to high energies: Maximum electron energy <sup>max</sup> = 2mc<sup>2</sup>[1-(ω<sub>0</sub>-ω<sub>1</sub>)<sup>2</sup>/c<sup>2</sup>(k<sub>0</sub>-k<sub>1</sub>)<sup>2</sup>]<sup>-1</sup>~2mc<sup>2</sup>(ω<sub>0</sub>/ω<sub>p</sub>)<sup>2</sup>. The multiple forward Raman instability produces smaller and smaller frequency and group velocity of photons; thus the photons slow down in the plasma by emitting accelerated electrons (inverse Cherenkov process).
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