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The elliptical electrode collector has much smaller height comparing to traditional one with same inner surface area. Quadrupole lens which focus high-energy particles very effectively was used on the first electrode of collector to compress the electron beam in one dimension. Based on the simulation, the elliptical electrode collector was manufactured and tested. Experiment results show that the...
A comparative study is given on the bunching mechanisms which develops in transit-time tubes with RF-field bunching, often referred to as monotrons. Uniform and stepped wise longitudinal electric-field profiles are discussed, and it is shown that the two-fold enhancement in the conversion efficiency of a monotron operating in the ?? mode-instead of the longitudinally uniform TM010 mode for which the...
The two-fold enhancement in the conversion efficiency of a monotron operating in the pi mode-instead of the TM010 mode for which the efficiency is limited to 20 percent-arises from a phase synchronization process due the action of RF electric fields of reversed signs in each partition of the bisected cavity.
RF field penetration has been proposed as a general mechanism for improving output power, efficiency, mode purity, mode selectivity and start-up times in relativistic magnetrons. RF field penetration is achieved through the use of a transparent cathode i.e. a cathode design consisting of a ring of small cathodes and no center cathode. However, RF field priming is not the only means available for improving...
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