Abstract
The relativistic magnetron has been studied as a high power microwave source since the 1970's. It is a simple, passive device requiring only a uniform magnetic field. It is possible to design a relativistic magnetron with center frequency from L-band to X-band, and it is possible to provide some modest frequency agility about the center frequency as well. Recently, researchers at the University of New Mexico proposed that a transparent cathode can significantly improve the output characteristics of magnetrons. Since then, a comprehensive study using particle-in-cell simulations has identified the many benefits of using this cathode. This paper will review the salient features of operating relativistic and non-relativistic magnetrons using a transparent cathode. In addition, progress from ongoing experiments at the University of New Mexico on an A6 magnetron driven by a short-pulse Sinus-6 accelerator will be presented. The presentation will conclude with a discussion of novel variants of the rippled-field magnetron (what we call the "Simplest Ubitron") that can produce coherent radiation as well as noise. Other devices benefiting from the transparent cathode will be discussed as well. (5 pages)
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