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Coherent microwave generation from a pseudospark cathode Cherenkov maser

Yin, H. and He, W. and Robb, G. R. M. and Phelps, A. D. R. and Ronald, K. and Cross, A. W. (1999) Coherent microwave generation from a pseudospark cathode Cherenkov maser. Physical Review Special Topics: Accelerators and Beams, 2 (2). ISSN 2469-9888

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Experimental results are presented from the first free electron maser experiment to use a pseudospark electron source. A pulsed, 70–80 kV, 10 A electron beam of normalized brightness 10^11A(m*rad)^(−2) and current density 1kAcm^(−2) from a pseudospark electron cathode was used to produce coherent microwave radiation via a Cherenkov interaction between the electron beam and the TM01 mode of a 60-cm-long alumina-lined waveguide. A gain of 29 dB was measured with an output power of 2 kW in the frequency range 25.5–28.6 GHz. The experimental results were found to be consistent with numerical simulations of Cherenkov amplification.