A high power X-band klystron

It is noted that the size and weight of industrial and medical electron linear accelerator systems can be significantly reduced by the use of an X-band source in place of the S-band source currently used. A description is given of a 4-MW (average 4-kW), 4- mu s, 9.3-GHz klystron developed specifically for industrial and medical accelerator applications. The peak output power achieved was 4.6 MW for beam voltage at 151 kV and beam current at 60 A. The duty was initially limited by a ghost mode in the RF window. This mode was suppressed by introducing a window, and the duty was increased to achieve 4.2-kW average output power at 5- mu s operation. The experimental results obtained with prototype klystrons as well as the design of a production model are presented.<>