Effect of a strong monochromatic electromagnetic wave with circular polarization on one-dimensional wake waves in plasma

A study is made of the excitation of wake waves by a one-dimensional bunch of charged particles in an electron plasma in the presence of an intense mo nochromatic pump wave with circular polarization. In the main state (in the absence of a-bunch), the interaction between a pump wave and a plasma is d escribed by the Maxwell equations and the nonlinear relativistic hydrodynam ic equations for a cold plasma. The excitation of linear waves by a one-dim ensional bunch is investigated against a cold plasma background. It is show n that, in a certain range of the parameter values of the bunch, pump wave, and plasma, the amplitude of the excited transverse waves grows as the ene rgy of the bunch particles increases until the relativistic factor of the b unch reaches a certain threshold value above which the transverse wave ampl itude becomes essentially independent of the bunch particle energy and grow s as the intensity and frequency of the pump wave increase. The amplitude a nd wavelength of the longitudinal field, which is shown to depend weakly on the energy of the bunch particles, grows with increasing the pump wave int ensity. (C) 2000 MAIK "Nauka/lnterperiodica".