Experimental measurements and field modeling for a W-band window

Abstract

An alumina ceramic window was designed and built for the LANL 94 GHz traveling-wave tube amplifier. The window is housed in a cylindrical pillbox cavity and connects to WR-10 waveguide on both input and output. It was designed for low duty operation at the 100 W level. The initial design of the window was performed with the program CASCADE. The transmission through the window was calculated and the window and cylindrical resonator dimensions were optimized for power transmission at 94 GHz and 2 GHz bandwidth. The design was later verified with the code HFSS. Four prototype windows were fabricated and tested.