Influence of Carbon Coatings on the Breakdown Threshold for an S-band Pillbox Output Window

摘要

On the basis of the results of X-ray photoelectron spectrum (XPS) detection, theoretical analyses and numerical simulations, the failure mechanism of an S-band pillbox output window applied in high average power klystron was discussed. The influences of high order cylindrical guide modes on the electric breakdown in the window were investigated, which shows that the TM_11 mode existing on the surface of the window ceramic disk may decrease the electric breakdown threshold and power capacity of the output window.