Study and Application on Technology of the Millisecond Long-pulse Modulator

Millisecond long-pulse high power modulator system technology is presented in this paper, in which the introductions are mainly focused on the technologies of long-pulse modulator strucutre, high-voltage switch, driving method and pulse-top-drop compensation. Two typical stucturs, two usual switches, three driving modes and four kinds of pulse-top-drop compensation technologies are discussed, concentrating on their operation principles, characteristics, applicable situations, merits and drawbacks. A -70 kV/50 A long-pulse high power modulator with a pulse-top-drop less than 5￡￥ in one millisecond is developed and described. At the same time, the test results are illustrated. The results show that the developed modulator technology is advanced. The indicators for this modulator concluding output power, waveform and the pulse-top-drop have reached the domestic leading level.