The aim of our work is the design of a simple and light, small and cheap mm-wave source with moderate power. Our choice has been a 25kV PPM-focused sheet beam klystron (SBK). However, the efficiency predicted for such a device is very poor: A low beam voltage means small coupling coefficients and a sheet beam profile means a gun with one-dimensional compression only resulting in a low current density. Thus, the performance can be improved by either splitting the wide beam into several round beams with higher current density, or by raising the beam voltage. In this paper the performance of a 25, 50 and 100kV mm-wave SBK is investigated. Simulation results for the electron guns and the cavity resonantors are presented and an overview on the predicted electrical parameters is given.
Our work is focused on the design of a small and light, simple and cheap millimeter-wave source. The present choice is a modular klystrino for medium power (½¼ ¼ kW) employing a 50 kV electron beam and periodic permanent magnet (PPM) focusing. In the paper we present the results of three dimensional computer simulations for a single klystrino stage. Particle-in-cell (PIC-) simulations have been performed in order to study beam bunching and beam transport. These computations are carried out with the parallel version of GdfidL.
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