THE SNS LINAC RF SYSTEM, SYSTEM STATUS AND VENDOR RESULTS*

The Spallation Neutron Source being built at the Oak Ridge National Lab in Tennessee requires a 1 GeV proton linac. Los Alamos has responsibility for the RF systems for the entire linac. The linac requires 3 distinct types of RF systems: 2.5-MW peak, 402.5 MHz, RF systems for the RFQ and DTL (7 systems total), 5-MW peak, 805 MHz systems for the CCL and the two energy corrector cavities (6 systems total), and 550-kW peak, 805 MHz systems for the superconducting cavities (81 systems total). The RF system for the superconducting cavities is unique in that up to twelve klystrons are operated from one pulsed-power system, and up to six klystrons are controlled and interlocked by a single transmitter. The design of the SNS Linac RF system was summarized in the 2001 Particle Accelerator Conference in Chicago [1]. Vendors have been selected for the klystrons (3 different vendors), circulators (1 vendor), transmitter (1 vendor), high power RF loads (2 different vendors), waveguide (2 vendors), and High Voltage system (2 vendors). This paper presents the results of vendor procurements and early test results of the major components of the Linac RF system. In addition the plan for installation and commissioning of such a large system will be described.