The nonlinear induced scattering of waves at plasma particles and its influence on the dynamics of beam instability is investigated. Within a definite range of plasma parameters in which the scattering of the waves at the ions is important, the scattering cross section increases considerably. In this case the transfer associated with the scattering, of the waves generated by the beam to the non-resonance region of the spectrum may lead to stabilization of the beam instabilities, even when intense extraneous "noise" is absent. The corresponding stability criterion is obtained. When the waves are scattered only at the plasma electrons, stabilization of the beam instabilities is possible by extraneous noise of large amplitude in the nonresonance region of the spectrum; we determine the energy of such noise to obtain stabilization.
研究了等离子体粒子对波的非线性散射及其对束流不稳定性的影响。在等离子体参数的一定范围内，当离子散射占主导时，散射截面显著增大。此时，束流产生的波通过散射将能量转移至非共振区域，即使不存在强外部噪声，也能导致束流不稳定性趋于稳定。我们得到了相应的稳定性判据。当仅考虑电子散射时，则需在非共振区域引入大振幅的外部噪声才能实现束流不稳定性的稳定化；我们计算了实现该稳定化所需的噪声能量。