National Science Center
Kharkov Institute of Physics and Technology

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Optimization of microwave gyrotrons
 Within the framework of the previously developed multimode theory the rigorous calculations were performed on the resonance frequencies and the diffraction Q-factor of operating and parasitic modes in the coaxial 2 MW 170 GHz gyrotron (Fig.1).
Coaxial cavity
Fig. 1 Coaxial cavity
 It is shown that the diffraction Q-factors of competing modes are in the essential dependence on the longitudinal profiles of the outer and inner radiuses of the cavity;
 Recommendations on the selective suppression of the most dangerous modes by the way of coaxial cavity geometry modification were developed;
 It is shown that the experimentally observed sharpening of the mode competition scenario in the coaxial gyrotron cavity is explained by the influence of the upper spatial harmonics.
  2008- SPE RESST
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