Title :
Three kilojoule, one hertz modulator
Author :
Smith, Richard S., III ; Woodard, Nathan G. ; Jenkins, David J. ; Thomas, Gary E. ; Treado, Todd A.
Abstract :
A 300 kV, 10 kA, spark-gap switched line-type modulator with a pulse width of 1 μs and a repetition rate of 1 Hz has been designed and constructed and is operational. An excellent flat-top pulse has been achieved. The output impedance is only 30 Ω. Two parallel 8:1 transformers are used, each with two parallel networks connected at the primary. Each of the four 1.9 Ω networks contains seven capacitors positioned for minimal return inductance. Each pair of adjacent capacitors is connected by four parallel inductors, to allow easy adjustment of both mutual and self-inductance. Variable series and parallel resistors allow further flexibility. The modulator is interfaced to a high-power microwave vacuum tube by an epoxy-cast high-voltage bushing. Voltages are monitored by two different types of custom-made voltage probes. The charging supply has been custom-modified to allow nearly a 1 Hz repetition rate
Keywords :
modulators; power capacitors; pulsed power technology; spark gaps; 1 Hz; 1.9 ohm; 10 kA; 3 kJ; 300 kV; capacitors; charging supply; epoxy-cast high-voltage bushing; flat-top pulse; high-power microwave vacuum tube; minimal return inductance; mutual inductance; output impedance; parallel inductors; parallel transformers; self-inductance; spark-gap switched line-type modulator; voltage probes; Capacitors; Impedance; Inductance; Inductors; Pulse transformers; Pulse width modulation; Resistors; Space vector pulse width modulation; Spark gaps; Voltage;
Conference_Titel :
Power Modulator Symposium, 1988. IEEE Conference Record of the 1988 Eighteenth
Conference_Location :
Hilton Head, SC
DOI :
10.1109/MODSYM.1988.26266
