Abstract
The traditional cylinder resonant cavity in a gyrotron is replaced with a photonic-band-gap resonant cavity (PBGC) with a structure of triangular arrays of metal posts, and the cold character of the TE operating modes in the PBGC are analysed and calculated. Under the consideration of the cavity structure features, a research method for the mode theory on PBGC is provided, single-mode operation in the cavity is found, and the distribution characteristics of the azimuthally inhomogeneous electromagnetic modes are reported. The study provides a physical theory fundament which reveals possibilities for changing the essential operating status of a gyrotron.
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