A New Generation of High Power CW-Klystrons for Accelerator and Storage Ring Application, Practical Experience and Aspects for Future Developments

In the PETRA storage ring of the DESY laboratory at Hamburg, a new generation of 600 kW, 60 % efficiency, modulating anode equipped cw high power 500 MHz klystrons has successfully passed its first two-year period of routine operation. Based on this experience, a development program is under way at Valvo Hamburg trying to push the state of the art to the 1 MW cw 70 % efficiency level. In addition to 500 MHz, the program includes klystrons with other frequencies in the 300 to 1000 MHz range.