E. N. Schmierer, K. C. D. Chan, D. C. Gautier, J. G. Gioia, W. B. Haynes, F. L. Krawczyk, M. A. Madrid, J. A. Waynert (LANL), B. Rusnak (LLNL)
For the baseline APT (Accelerator Production of Tritium) linac design, power couplers are required to transmit 250-kW of CW RF power to the superconducting cavities. These APT couplers operate at 700 MHz, have a coaxial design and an adjustable coupling to the superconducting cavities. Since May 1999, we have been testing couplers of this design on a room-temperature test stand. We completed tests at transmitted-power and reflected-power conditions up to 1 MW. We also tested the couplers when a portion of the outer conductors was cooled by liquid nitrogen. Under this latter condition, we studied the effects of condensed gases on the coupler performance. The results of these tests indicate that the APT couplers are capable of delivering more than 500 kW to the cavities. We are in the process of increasing the baseline coupler design requirement to 500 kW of transmitted power to take advantage of this successful development. In this paper, we describe the results of our high-power coupler tests.
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