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To produce broadband electromagnetic pulse (EMP) radiation, we design and test a sub-ns pulse system which is utilized to drive an axial mode helix antenna. This sub-ns pulse system consists of a 10-stage Marx generator, an intermediate storage capacitor, an impedance transforming line, and can generate a high voltage of 570 kV with a rise time of 1-1.5 ns on a 300-Ω-resistance load. The diameter, pitch and turns of the helix antenna are 29 cm, 19.5 cm and 5, respectively, with a design frequency of 300 MHz. When the charging voltage of the Marx generator is 30 kV, the electric field of radiated EMP measured 3m from the source is 35 kV/m with a central frequency of 250 MHz. The relatively spectral bandwidth is 25%. The radiated EMP results are reproducible and the system will work in repetition mode if the available dc power is utilized.

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This paper describes the designs and experimental investigation of indirectly charged two stage helical explosive magnetic flux compression generator (MFCG), pulsed power conditioning system with explosive metal wire array opening switch and the combined experimental results of the two systems above. This MFCG can generate high current (115kA) on comparatively high inductance inductor (4.5µH). The length of current pulse (from zero to the biggest) on the inductor is about 10µs. Energy gain of the MFCG is greater than 30 times. Combined experiment of the two system shows that more than 25GW of high power pulse can be reached on 10Ωload resistor, and width of the pulse is more than 150ns. The experiment shows that the systems of which we studied are very successful and practical in producing high power pulse for MFCG.