Experience on the high-power SiC microwave dummy-load using SiC absorber

A new type microwave dummy-load using SiC ceramic, which has an indirect water cooling structure, was successfully operated with up to 50-MW of rf power at a 1-/spl mu/s pulse width and 50-pps repetition rate in the S-band frequency. The input VSWR obtained was less than 1:1.1 at the maximum rf power. The vacuum pressure in the rf-load raised from the base pressure of 1/spl times/10/sup -6/ Pa with no rf power to 2/spl times/10/sup -6/ Pa at the maximum rf-power; and there was found to be no special outgassing from the SiC-ceramics.