THE ENHANCEMENT BY RESONANT ELECTRONS OF INTENSITY OF STIMULATED SCATTERING

An investigation is made on the effect of wave-trapped (resonant) part icles on the stimulated scattering of an electromagnetic wave in a pla sma It is shown that the intensity of the three-wave (two electromagne tic and one longitudinal) interaction depends on the degree of the ele ctron distribution function asymmetry relative to the phase velocity o f the longitudinal wave and the latter amplitude. The intensity may ex ceed the one calculated neglecting the trapping and it is determined b y the nonlinearity to the power 3/2 stronger for small amplitudes than usual quadratic one.