title: Characterization of stationary and nonstationary behavior in gyrotron oscillators.
abstract: The transition from the stationary state to a sequence of nonstationary states in the gyromonotron oscillator is experimentally characterized for the first time. We have also demonstrated the stationary operation of a gyrotron backward-wave oscillator at a beam current far in excess of the generally predicted nonstationary threshold. This difference in nonlinear behavior has been investigated and shown to be fundamental with a comparative analysis of the feedback mechanisms, energy deposition profiles, and field shaping processes involved in these two types of oscillations.
authors.affiliation: Department of Physics, National Tsing Hua University, Hsinchu, Taiwan.
authors.forename: T H
authors.initials: TH
authors.lastname: Chang
authors.forename: S H
authors.initials: SH
authors.lastname: Chen
authors.forename: L R
authors.initials: LR
authors.lastname: Barnett
authors.forename: K R
authors.initials: KR
authors.lastname: Chu