Nonlinear wave processes during the propagation of a high-current electron beam in an ion-beam undulator

The results of investigations of ion beam undulator stability concerning the excitation of nonstationary waves and electron-ion instabilities in two-beam electron-ion system are presented. The instabilities are studied in different regimes by computer simulation. The detrimental influence of the instabilities on the ion undulatorʹs performance is demonstrated. Conditions for minimal influence of the instabilities on the beamʹs dynamics are found.