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28 October 1996 Evolution of spectral power density in grounded-cathode relativistic magnetron
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A novel, rep-rated, relativistic magnetron design is demonstrated. Unlike other relativistic magnetrons, the high voltage pulse is positively charged, feeding the anode block, while the cathode is grounded. Moreover, the anode- cathode interaction space is centered in a larger buffer cavity that serves as an electric insulator and electromagnetic impedance matching between the anode block and the exit waveguide(s). The grounded cathode geometry eliminates the axial current (improving efficiency) and enables the use of compact, CW, U-shaped electromagnet. It may also be utilized for frequency tunability through the buffer cavity in a way similar to coaxial magnetrons. Operation with peak power of 50 MW (100 MW) and pulse length of 150 ns (70 ns) has been achieved. Employing metal- dielectric cathodes led to repetitive operation up to 10 Hz. The analysis emphasizes time-resolved spectral power density of both in-cavity and emitted microwaves in regard to the undesirable occurrence of pulse shortening.
© (1996) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Itzhak Schnitzer, Avner Rosenberg, Chaim Leibovitch, I. Cohen, M. Botton, and J. Leopold "Evolution of spectral power density in grounded-cathode relativistic magnetron", Proc. SPIE 2843, Intense Microwave Pulses IV, (28 October 1996);

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