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A design approach for a multistage depressed collector system for gyrotron is presented here. The new concept based on two steps: (i) the transformation of the cylindrical hollow beam to sheet beam and (ii) the sorting of the spent beam electrons on the electrodes, based on ExB approach, in order to achieve the optimal efficiency. The simulation results predict very high levels of efficiency (more...
Multistage Depressed Collectors (MDCs) have been successfully applied in many kinds of vacuum tubes; however, there are only few discussions about applicable MDCs for high-power gyrotrons, regarding the hollow small-orbit electron beam and relatively strong stray magnetic field in the collector region. A novel concept has been recently proposed, where the electron beam is transformed into one or more...
Fusion gyrotrons are high-power microwave sources which are capable to generate RF power in the MW range at millimeter wave and sub-THz frequencies. Today, typically around 35 % electronic efficiency is achieved in the energy transfer (interaction) from the electron beam to the electromagnetic field. Using a single-stage depressed collector (SDC), the overall efficiency of a gyrotron can be increased...
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