Multistage depressed collector design approach for gyrotron

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 than 80%) and this idea can open up new perspectives in gyrotron technology.