Interaction between a vircator microwave generator and a resonant cavity is produced by enclosing the virtual cathode inside a right circular cylinder. By varying the cavity length, frequencies corresponding to the TM01n cavity modes are tuned to resonate with the broad- band oscillating virtual cathode. Nonresonant frequencies are suppressed, decreasing the bandwidth of the emitted radiation by a factor ≥5. Measured microwave power is about 4 times that from a detuned cavity.
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Benford et al. (1987) studied this question.
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