Improved theory of energy losses in corrugated inner conductor of coaxial gyrotron cavity

Abstract

The improved theory of Ohmic losses which takes into account effects of a field increase near edges of corrugations is developed for a coaxial gyrotron cavity with a corrugated inner conductor. It is shown that for the ITER relevant TE 3 4 ,1 9 coaxial gyrotron operating at the maximal output power (-2 MW) they do not lead to a notable increase of the total losses in the corrugated inner insert. However they can contribute substantially to the local density of losses near edges of corrugations especially in the shot pulse regimes when contribution of higher axial harmonics to the total field can be substantial.

On the theory of longitudinally inhomogeneous waveguides with impedance walls

“…The considered effects may lead to a significant reduction in the gyrotron efficiency in the terahertz range. The method for attenuation of ohmic losses may be based on the use of cavities with corrugated walls [26][27][28].…”

Analysis of a Triangular Corrugated Coaxial Cavity for Megawatt-Class Gyrotron

“…A full-wave code was used to calculate the eigenvalue of corrugated coaxial cavities, and stricter criteria for applicability for SIM were given in [13]. An improved theory of ohmic losses considering the effect of field near the edges of corrugation on the insert for coaxial cavity gyrotron was given in [14]. An efficient universal method for numerical analysis of slotted cavities was proposed in [15].…”