Preliminary study on space density distribution of intense electron beam in foilless diode

By electron beam impacting experiment of metal target and copper foil pasted on the inside surface of collector, with high magnetic field and annular graphite cathode (38-39 mm), the space density distribution of electron beam in the foilless diode and its forming reasons are preliminarily studied. It is shown that the electron beam is at 37.2-40.2 mm in radial direction, and there are a high density region (38.8-39.4 mm) and a density maximum (39.2 mm) which tend to the outboard of the cathode in the electron beam. The radial density distribution of electron beam explosively emitted from the annular cathode of the foilless diode can be approximated by nonsymmetrical distribution.