Propagation of Intense Pulsed Electron Beams with Energies below 80 KeV

The transporting behaviours of intense pulsed electron beams in the low pressure gas are experimentally investigated. The results presented in this paper show that the selfpinching of electron beams in the ambient pressure about 10 Pa for nitrogen, air etc., takes place. After bombardment of single beam pulse, a interference-like fringe having a pattern of colored rings appears on the surface of witness film, thus one can make a dedution of the space configuration during the propagation of the pulsed electron beam. As a result of beam deflection by an external magnetic field, the configuration-space instabilities of the self-contracting plasma of electron beam occur, therefore, the beam filament effect is evidently observed. Such intense pulsed electron beams are extracted from anode hole of a multiplate chamber behaving as a foilless "vacuum diode" with high efficiency. Many attractive potential applications are expected for the electron beams.