Optimized design of a 10 MW, L-band, Annular Beam Klystron

The design of a 10 MW, 1.3 GHz Annular Beam Klystron for ILC has been analyzed in detail and optimized. Concerns about the diocotron instability were addressed by MAGIC simulations, which showed the growth to be negligible. Design improvements reduced the number of cavities to six and increased the efficiency to 66%. The magnetic field was reduced by 25%, decreasing the power required for the solenoid to less than 4% of the average power of the tube.