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Simulation of microwave tube collectors

The problem of microwave tube collectors simulation using two- and three-dimensional codes (EOS-2 and EDS-3) are considered. The self-consistent solution of the fields and electron trajectories on the two dimensional levels have been obtained taking into consideration the secondary electrons from collector surfaces. The method of calculation of the asymmetric collectors is developed on the basis of a 3D model of electron beams. The examples of TWT's collector calculation are given.