title: Linear and time-dependent behavior of the gyrotron backward-wave oscillator.
abstract: Formation of axial modes in the gyrotron backward-wave oscillator is examined in the perspective of optimum conditions for beam-wave interactions. Distinctive linear properties are revealed and interpreted physically. Nonlinear implications of these properties (specifically, the role of high-order axial modes) are investigated with time-dependent simulations. Nonstationary oscillations exhibit self-modulation behavior while displaying no evidence of axial mode competition. Reasons for the erratic frequency tuning are investigated and stable tuning regimes are identified as a remedy.
authors.affiliation: National Center for High-Performance Computing, Hsinchu, Taiwan.
authors.forename: S H
authors.initials: SH
authors.lastname: Chen
authors.forename: T H
authors.initials: TH
authors.lastname: Chang
authors.forename: K F
authors.initials: KF
authors.lastname: Pao
authors.forename: C T
authors.initials: CT
authors.lastname: Fan
authors.forename: K R
authors.initials: KR
authors.lastname: Chu