Experimental investigation on spiral folded long pulse modulator

A high power long pulse folded coaxial spiral transmission line pulse modulator was researched. The pulse modulator combined the spiral and folded transmission line methods together to generate long pulse, which made it more compact in structure. The voltage at the load was theoretical analyzed using the method of solving telegraph equation and the voltage at the load was calculated using the PSpice software under different condition. Finally, experiments were carried out. At the gas breakdown voltage of 720 kV, a quasi-square pulse with a voltage of 360 kV, a current of 24 kA and a pulse width of 264 ns was obtained at the load.