Session RP1 - Poster Session VIII.
POSTER session, Thursday afternoon, October 30
Fran Hill Southeast Exhibit Hall, ACC
Relativistic magnetrons are a promising source of high power microwaves, combining high power and repetition rate with the potential for high efficiency. Although they have been actively investigated for over three decades, much of the theoretical work has focused on the performance of the source itself, typically without the complication of power extraction schemes. Experimentally, however, it has been observed that the loading of cavities due to extraction can greatly increase the potential for mode competition, as well as complicate the resonant structure of the device. In this work, we develop a circuit model for a relativistic, cylindrical, N-cavity magnetron with M extractors. In order to predict the growth rates of the modes the beam is prescribed as either a cycloidal electron flow or Brillouin electron flow. The impact of these two models for the electron dynamics with be compared and contrasted. Detailed analysis of the hot tube, small signal, growth rates for the magnetron modes will be examined with both a simple analytic space charge model and a semi-empirical model found from 3-D particle-in-cell simulation. Implications on extractor design, mode competition, and optimization of the relativistic magnetron will be discussed.