Abstract: This paper describes work being done to develop high-power 11.4-GHz relativistic klystrons suitable for driving future linear colliders. Peak rf power levels of 330 MW have been achieved using an 11.4-GHz, high-gain tube with multiple output structures. In these experiments the rf pulse is of the same duration as the beam current pulse. Experiments have been performed on two short sections of high-gradient accelerator using the rf power from a relativistic klystron. An average accelerating gradient of 84 MV/m has been achieved with 80-MW of rf power. The use of the front end of the Advanced Test Accelerator at Lawrence Livermore National Laboratory will allow future tests of new rf sources and tests of two-beam accelerator concepts.!
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