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In this paper,the method of calculating cut-off frequencies of TE modes in elliptical waveguideis given.From the calculations,it is demonstrated that the gyrotron utilizing a cavity with ellipticalcross-section of moderate eccentricity has the following characteristics:(a)a large volume cavitycan be used;(b)the density of modes which can oscillate is low;(c)it is allowable to use an electronbeam with a large diameter;(d)it is possible to use a cavity mode with low azimuthal number.
In this paper, the method of calculating cut-off frequencies of TE modes in elliptical waveguide given. From the calculations, it is demonstrated that the gyrotron utilizing a cavity with elliptical cross-section of moderate eccentricity has the following characteristics: (a) a large (b) the density of modes which can oscillate is low; (c) it is allowable to use an electron beam with a large diameter; (d) it is possible to use a cavity mode with low azimuthal number.