title: Nanosecond pulses in a THz gyrotron oscillator operating in a mode-locked self-consistent Q-switch regime.
abstract: An experimental study of a nanosecond pulsed regime in a THz gyrotron oscillator operating in a self-consistent Q-switch regime has been carried out. The gyrotron is operated in the TE(7,2) transverse mode radiating at a frequency of 260.5 GHz. The 5 W nanosecond pulses are obtained in a self-consistent Q-switch regime in which the cavity diffraction quality factor dynamically varies by nearly 2 orders of magnitude on a subnanosecond time scale via the nonlinear interaction of different mode-locked frequency-equidistant sidebands. The experimental results are in good agreement with numerical simulations performed with the TWANG code based on a slow time scale formulation of the self-consistent time-dependent nonlinear wave particle interaction equations.
authors.affiliation: Centre de Recherches en Physique des Plasmas, Station 13, Ecole Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland.
authors.forename: S
authors.initials: S
authors.lastname: Alberti
authors.forename: F
authors.initials: F
authors.lastname: Braunmueller
authors.forename: T M
authors.initials: TM
authors.lastname: Tran
authors.forename: J
authors.initials: J
authors.lastname: Genoud
authors.forename: J-Ph
authors.initials: JP
authors.lastname: Hogge
authors.forename: M Q
authors.initials: MQ
authors.lastname: Tran
authors.forename: J-Ph
authors.initials: JP
authors.lastname: Ansermet