Abstract
RF pulse shortening is a long-standing issue in high power microwave (HPM) devices. Several causes have been observed or proposed over the years, including cathode and anode plasma expansion, multipactor RF window breakdown, poor RF contacts, and generator impedance mismatch. In our recirculating planar magnetron (RPM) experiments at the University of Michigan [1], we routinely encounter this phenomenon, and have previously attributed it to expanding cathode plasma, which modifies the synchronism condition and disrupts magnetron operation. Using an ultra-fast intensified 12-frame camera, we have now imaged the plasma formation and evolution within the magnetron. These images provide insight into the probable sources of pulse shortening in the RPM.
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