Principal scheme of conventional (a) and planar (b) gyrotrons using in 3D simulations. Wavy arrows indicate the direction of energy extraction.
Results of simulations of a conventional terahertz gyrotron: (a)—onset of a steady-state regime for a guiding magnetic field of 38.4 T; (b)—radiation spectrum; (c)—spatial distribution of the longitudinal component of the magnetic field with one longitudinal variation in the plane.
Excitation of different waveguide modes in a conventional terahertz gyrotron: (a)—operating frequency (solid line) and output power (dashed lines) as functions of the guiding magnetic field (the gaps between zones of single mode generation correspond to the area of modes beating), point A with error bars corresponds to the experimental measurements (Ref. 3 ); (b)—transverse structures of the excited modes.
(a) The regime of modes competition for a guiding magnetic field of 38.95 T; (b) and (c) radiation spectra for different time intervals in a conventional gyrotron.
Output powers of conventional (dashed line) and planar (solid line) gyrotrons as functions on the total current for a guiding magnetic field of 38.1 T.
(a)—Onset of a self-modulation generation regime; (b)—radiation spectrum corresponding to the longitudinal mode-beat pattern.
Results of simulation of a planar gyrotron with transverse energy extraction: (a)—onset of a steady-state generation regime for a guiding magnetic field of 36.7 T; (b) and (c)—spatial distributions of the excited TE1,11 mode of an open planar waveguide; (b) field profile in the plane with one variation along both coordinates; (c) transverse structure in the plane.
Smooth tuning of the oscillation frequency of a planar terahertz gyrotron by variation of the cavity gap width .
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