Improvement of Mode Selectivity of High-Harmonic Gyrotrons by Using Operating Cavities with Short Output Reflectors

  • Yuliya S. Oparina
  • Andrey V. Savilov


An important problem in realization of gyrotrons operating at high cyclotron harmonics is discrimination of parasitic oscillations excited at lower harmonics. In this paper, we propose to use an operating cavity with a short output irregularity providing a partial reflection of the operating wave. This allows decreasing the length of the cavity with no considerable change in both the operating electron current and the efficiency of the gyrotron operation. At the same time, since the output irregularity weakly reflects parasitic low-frequency waves, the reduction in the length of the cavity leads to a significant increase in the starting currents of the parasitic near-cutoff waves.


THz radiation Gyrotron High cyclotron harmonics Mode selection 


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Authors and Affiliations

  1. 1.Institute of Applied PhysicsRussian Academy of SciencesNizhny NovgorodRussia
  2. 2.Lobachevsky State University of Nizhny NovgorodNizhny NovgorodRussia

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