Optimization of microwave gyrotrons :: SPE RESST

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).

	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.