X-band klystron development at KEK

Abstract

X-band klystrons (XB-72K) designed for the Next Linear Collider (NLC) are described. Klystrons having traveling-wave output structures in order to reduce the electric fields and an RF output power of around 70 MW have been obtained. A new klystron-simulation code using "MAGIC" has been developed at KEK, and the simulation results agree well with the experimental data. The next klystron was designed using the code; an RF output of 120 MW is obtained in the simulation. The klystron is being manufactured and it will be tested this November.