Long pulse electron beam generator based on Tesla transformer and pulse forming network

A novel approach for producing long pulse is presented. The generator based on this approach consists of a Tesla transformer and a set of pulse forming network (PFN). Tesla transformer is used to charge PFL and PFN in series. When the voltage increases to a certain value, the primary switch will close and the PFL and PFN will discharge rapidly to the load. Therefore, an electric pulse of a certain width is formed on the load. The amplitude of this pulse is dependent only on the charge voltage and the matching state of the load and PFN (PFL). The pulse width is determined by transmission time of PFL and PFN. The rise time is determined by the working state and the impedance of PFN, and independent of the parameters of PFN. The PFN is multi-stage and assembled in series. The direction of main dielectric flux is axial and the time modulation is angular. The single-stage PFN is formed with two-row ceramic capacitors placed between two aperture annular plates. The total series impedance is equal to the sum of every single-stage PFN's impedance. Moreover, a tested generator based on this approach is developed. For this device, PFN of nine stages is in series, and the total impedance is 40Ω. The high voltage of amplitude 295kV, current 7kA and duration ∼110ns is produced at repetition frequency of 10 Hz. And the rise time of voltage waveform is only ∼7ns.