The mm-wave sheet beam klystron: performance at different voltages

Abstract

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.

Sources of power coherent terahertz band radiation

“…В 1999 г. в США была сформирована программа MURI-99 (Microwave Vacuum Electronics Initiative), в которой приняли участие целый ряд промышленных компаний и университетов США и Канады. Интенсивные разработки ведутся также в области конструирования клистронов с ленточным лучом [5]. Отмечается, что такая конструкция может позволить получить выходную импульсную мощность в несколько десятков кВт в W-диапазоне.…”

Design and Characterization of X-Band Sheet Beam Klystron Cavity

“…R/Q of the cavity is also much less than that of the conventional Klystron [6]. Major objectives in the cavity design of sheet beam tubes are a flat field across the whole beam width, a large (unloaded) shunt impedance and reduction of transit time effect [7].…”