Numerical simulation on the energy spectrum of the electron beam generated by lowimpedance diode and the influence of external magnetic field on diode impedance

of diode are studied numerically in this paper. The results show that the beam generated by the diode has an energy spread，even with constant applied voltage. Additionally, external magnetic field has great but reverse influence on the impedance of lowimpedance diode, which is, according to the author's analysis, the result of the change of the electron's track due to external magnetic field. If the beam current is less than the critical one for selfpinch, the impedance will be constant with the variation of external magnetic field.The energy spectrum of the electron beam generated by lowimpedance diode and the influence of external magnetic field on the impedance