Status of Superconducting RF Linac Development for APT

This paper describes the development progress of high-current superconducting RF linacs in Los Alamos, performed to support a design of the linac for the APT (Accelerator Production of Tritium) Project. The APT linac design includes a CW superconducting RF high-energy section, spanning an energy range of 211-1030 MeV, and operating at a frequency of 700 MHz with two constant-beta sections (beta=0.64 and beta=0.82). In the last two years, we have progressed toward building a cryomodule with beta=0.64. We completed the designs of the 5-cell superconducting cavities and the 210-kW power couplers, and are currently testing the cavities and the couplers. We are scheduled to begin assembly of the cryomodule in September 2000. In this paper, we present an overview of the status of our development efforts and a report on the results of the cavity and coupler testing program.