This paper is devoted to study the starting current of the coaxial relativistic backward wave oscillator (CRBWO) using a simple physical model that employs the eigenmodes of the enclosed resonant cavity and the external quality factor of the open cavity Q. The agreement between the theoretical and simulation results is presented. It is found that CRBWO is suffering from the mode competition during the startup of the oscillation due to the wide interaction region over the range of the longitudinal wavenumbers.
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Teng et al. (2010) studied this question.
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