Abstract
Recent experiments on the UM Recirculating Planar Magnetron (RPM) [1], have utilized a 12-frame ultra-fast intensified CCD camera to analyze the effect of anode and cathode plasma formation on microwave pulse duration. The experiments were driven by MELBA-C, a Marx-Abramyan system, which delivers a −300 kV voltage pulse for 0.3-1.0 μs, with a 0.13-0.31 T axial magnetic field applied by a pair of electromagnets. The RPM was tested with both an S-band (2 GHz) and L-band (1 GHz) anode, as well as two different cathodes with substantially different thickness and end caps. A smaller anode-cathode gap, coupled with larger end-loss current, produced brighter plasma and allowed for improvements in temporal resolution of the imaging configuration. Many shots demonstrated a direct correlation between anode-plasma formation and a sharp reduction in RF power.
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