title: Nonstationary phenomena in tapered gyro-backward-wave oscillators.
abstract: Recently, it was found that a gyro-backward-wave oscillator (gyro-BWO) with a tapered waveguide can exhibit stationary oscillations at currents which exceed the starting current by more than 2 orders of magnitude. This result, at first glance, contradicts the theory of transients in untapered linear-beam BWO's, which predicts nonstationary oscillations at currents exceeding the start current by a factor of 3. To explain this behavior of the tapered gyro-BWO, its nonstationary theory is developed. The results obtained demonstrate the consistency of the tapered gyro-BWO operation with the known theory of transients and also show that the tapering may provide stationary oscillations at high currents.
authors.affiliation: Institute for Research in Electronics and Applied Physics, University of Maryland, College Park, Maryland 20742, USA.
authors.forename: G S
authors.initials: GS
authors.lastname: Nusinovich
authors.forename: A N
authors.initials: AN
authors.lastname: Vlasov
authors.forename: T M
authors.initials: TM
authors.lastname: Antonsen