Design and Operation of a 2.7 MW Periodic Permanent Magnet Focused X-band Klystron

A compact periodic permanent magnet focused 9290 MHz klystron is described that produces 2.7 MW of output power with 52 dB of gain and 43% efficiency. Three klystrons have been manufactured that exhibited a high degree of repeatability and robustness with all meeting the performance requirements. The goal of a first-time-through design success was met through the use of extensive multidimensional modeling of all aspects of the klystron. Agreement between simulated and measured performance was very good.