Large Scale Production of 805-MHz Pulsed Klystrons for the Spallation Neutron Source Project

The Spallation Neutron Source (SNS) is an accelerator-based neutron source being built in Oak Ridge, Tennessee, by the U.S. Department of Energy. CPI is supporting the effort by providing 81 pulsed klystrons for the superconducting portion of the accelerator. The primary output power requirements are 550 kW peak, 49.5 kW average at 805 MHz, with an electron beam-to-rf conversion efficiency of 65% and an rf gain of 50 dB. Tests were performed that verified the tube could provide over 1 MW peak with minimal changes. Through April 2005, 77 units have been factory-tested. Performance specifications, computer model predictions, operating results, and production statistics will be presented.