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DEVELOPMENT OF A SEQUENTIALLY SWITCHED MARX GENERATOR FOR HPM LOADS


J.R. Mayes and C.W. Hatfield
Applied Physical Electronics, L.C., PO Box 341149
Austin, Texas, USA

ABSTRACT

Relativistic Magentrons prefer trapezoidal-shaped, high voltage pulses, as opposed to the double exponential waveshape characteristic of a Marx generator. Traditional approaches use intermediate Pulse Forming Lines (PFNs) or stacked Blumleins to create the desired pulse shape. Marx generator-driven PFNs are unacceptable, due to their size and additional overhead. Stacked Blumleins are very difficult to switch, when a large number of lines are required, which results in small line impedances. Applied Physical Electronics L.C. is developing a novel Marx generator topology that results in a rectangular waveshape, without additional pulse conditioning hardware. The topology is based on a multi-generator design. Each generator is sequentially switched to the common load, so as to simulate a rectangular waveshape. In essence, the desired rectangular pulse shape is built temporally, and the capacitance of the load can be designed to reduce the ripple in the load waveform. Each generator can be uniquely charged and triggered, resulting in a programmable, high voltage waveform generator. The generator is described for its geometry. Simulation and experimental results are provided.

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