A compact high-voltage repetitive nanosecond pulse generator(HRNPG)was developed for studying the technology of repetitive nanosecond pulse technology and its related application.The HRNPG mainly consists of a repetitive charging module,a Tesla transformer and a sharpening switch.With its voltage lower than 1 kV,the primary repetitive charging circuit comprises two fast thyristors as its low-voltage switches.The spiral Tesla transformer acts as the main step-up component,and its peak transformation ratio is designed to be more than 100.A self-breakdown spark switch,i.e.the sharpening switch,is used to sharpen the output of the transformer and to generate nanosecond pulses.The HRNPG prototype is capable of generating pulses of 100 kV in peak with rise time 30 ns and the maximum repetition rate of 500 Hz on a 6 k load.Experimental results show,without any magnetic core,the developed Tesla transformer prototype can easily output high voltage while keeping itself small in size and light in weight,which is of significance for the compactness and portability of the pulse generator.The N2-insulated spark switch operated well at voltage close to 100 kV and the repetition rate within several hundreds of hertz. A compact high-voltage repetitive nanosecond pulse generator (HRNPG) was developed for studying the technology of repetitive nanosecond pulse technology and its related application.The HRNPG mainly consists of a repetitive charging module, a Tesla transformer and a sharpening switch. than 1 kV, the primary repetitive charging circuit comprises two fast thyristors as its low-voltage switches. The spiral Tesla transformer acts as the main step-up component, and its peak transformation ratio is designed to be more than 100. A self-breakdown spark switch, iethe sharpening switch, is used to sharpen the output of the transformer and to generate nanosecond pulses. The HRNPG prototype is capable of generating pulses of 100 kV in peak with rise time 30 ns and the maximum repetition rate of 500 Hz on a 6 k load. Experimental results show, without any magnetic core, the developed Tesla transformer prototype can easily output high voltage while keeping itself small in size and light in weight, which is of significance for the compactness and portability of the pulse generator. N2-insulated spark switch operated well at voltage close to 100 kV and the repetition rate within several hundreds of hertz.