Electron Trajectory Tracing in M-type Travelling Wave Tube by means of Electrolytic Tank Analog

Abstract

This paper deals with experimental results of measuring electron trajectories in M-type travelling wave tube by means of analog simulation method. Automatic electron trajectory tracer reported before was used which can trace the path of electron moving under the simultaneous application of electric and magnetic field by combining an electrolytic tank and an analog computer. The electromagnetic fields in this tube can be separated into two regions; one is near the electron gun, and other is along the slow wave circuit. The former field is simulated by hyperbolic and plane electrodes in the tank, and the electron trajectories are traced by computing the equation of motion with the parameters given from this analog tank field. On the other hand, high frequency exciting fields which appear in slow wave circuit, are simulated in a way such that the electron velocity and the frequency of exciting fields are reduced by the same time scale factor. A method of analog simulation and results of measurement of electron trajectories are discussed.