S. TOKUMOTO, Y. H. CHIN, S. MATSUMOTO, H. MIZUNO, K. OHYA, S. YAMAGUCHI (KEK), S. KAZAKOV (BINP), R. LOEWEN, R. FOWKES, A. MENEGAT, A. VLIEKS (SLAC)
In this paper, we summarize the high power testing results of the X-band mixed-mode RF window at KEK and SLAC for linear colliders. The main feature of these windows is that the combination of modes on the surface of the ceramic significantly reduces the electric and magnetic fields in the junction between the ceramic and the metal. So far two types of high power windows (with the diameter of 53mm and 64mm) have been fabricated. A high power model of the smaller type window was fabricated and tested in a resonant ring at KEK. A maximum circulating power of 81 MW with 300ns duration or 66 MW with 700 ns duration was achieved. Light emission was observed for a power level of over 10 MW. Later, both windows were shipped to SLAC for even higher power testing using combined power from two klystrons. The first window (53mm diameter) achieved a circulation power of 80MW with 1.5 microsec duration at 30Hz repetition. It was not destroyed during the testing. The testing of the second window was still on going. The final results of high power testing of both window will be presented in this report.
Comments or Questions to