Virtual anode as a source of low-frequency oscillations of a high-current electron beam

The results of studying the transport of the relativistic electron beam with the current above the critical one in the cylindrical drift chamber in the presence of the ion flux are presented. The theoretical analysis of the electron-beam formation dynamics is based on the large-sized particle method. It is shown that by the joint injection of the supercritical electron beam and low-energy wak-current ion beam in the drift chamber there may be formed the virtual anode along with the virtual cathode. The virtual anode is periodically pulsating. It is shown that the ratio of the pulsating frequencies is inversely proportional with the ions mass