Relativistic Magnetron Priming Experiments and Theory

Abstract

The publit reporting burden for this collection of information is estimated to average 1 hour per response, including ' gathering and maintaining the data needed, and completing and reviewing the collection of information. Send comments information, including suggestions for reducing the burden, to the Department of Defense, Executive Services and Conthat notwithstanding any other provision of law, no person shall be subject to any penalty for failing to comply with a ». control number. PLEASE DO NOT RETURN YOUR FORWI TO THE ABOVE ORGANIZATION.AFRL-SR-AR-TR-05- PERFORMING ORGANIZATION NAME(S) AND ADDRESS(ES)University of Michigan Ann Arbor, MI 48109 PERFORMING ORGANIZATION REPORT NUMBER SPONSORING/MONITORING AGENCY NAME(S) AND ADDRESS(ES)Air Force Microwave/ RF priming experiments have been performed on the UM relativistic magnetron. The high power RF priming source (40 kV, non-relativistic magnetron) was obtained on-loan from the Air Force Research Lab. Microwave power output from the AFRL priming magnetron was input into one arm of the three-waveguide exfraction system on the relativistic magnetron. The UM/ Titan A6 relativistic magnetron was driven by MELBA-C; the ceramic insulator yields 10-8 Torr scale vacuum for quasi-hard-tube conditions. Microwave priming experiments showed mode-beating effects at power levels and frequency detuning consistent with Adier's equation. Effects of microwave priming on start-oscillation time and microwave pulselength were also characterized. Major breakthroughs in this research were the discovery and demonstration of two new magnetron priming techniques: magnetic priming and cathode priming. Magnetic priming was patented by UM (US patent No. 6,872,929