Study on Compact High Power Microwave Source

A compact high power microwave source based on power combining of permanent magnet focused klystrons and pulse compression is proposed. The microwave source includes four parallel klystrons simultaneously driven by a high voltage pulse modulator. The modulator utilizes several high step-up ratio pulse transformers with multi-parallel primary coils excited by corresponding low voltage pulse modulator cells, and the secondary coils of all the transformers are series connected in sequence. Each klystron can provide 10 MW peak power with microsecond level pulse width. A planar eight-port power combiner is used to achieve the power combining of four klystrons. Also a spherical cavity pulse compressor is used to multiply the output microwave peak power from several tens of megawatts to more than 200 MW, and to compress the pulse width from a few microseconds to 100 ns.