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High-power, high efficiency, injection-locked, secondary-emission magnetron

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5 Author(s)
T. A. Treado ; Varian Associates, Beverly, MA, USA ; R. A. Bolton ; T. A. Hansen ; P. D. Brown
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A 60-MW, 60% efficient, 35 J/pulse secondary-emission magnetron at S-band is described and experimental results from this moderate voltage (<120 kV), repetitively pulsed (10 Hz), injection locked (14-15 dB gain) device are reported. Efforts to minimize high-voltage and RF breakdown at high power are described. Results from particle-in-cell code computer simulations compare very well with the experiment when space-charge-limited emission is assumed. Several factors which can limit the power and pulse length from this magnetron, including RF and high-voltage breakdown, cathode emission, and transport heating, are discussed. By increasing the voltage, the drive power, and the magnetron length and by using a tungsten alloy anode, 120 MW should be achievable for approximately 4-μs pulses at 130 kV, with the pulse length limited by transient heating of the anode

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IEEE Transactions on Plasma Science  (Volume:20 ,  Issue: 3 )