P1–9: Development of a 10 MW 1.3 GHz annular beam klystron for ILC

This paper describes a 10 MW, 1.3 GHz klystron for ILC that uses an annular beam, providing a perveance of 3.3 micropervs. The beam voltage is 120 kV, and the calculated efficiency is 60%. The principal components of the device, including the RF structure, electron gun, magnetics, and output coupling are described.