Simulation and design of electron gun for travelling wave tube with particle in cell code

Thesis Type: Postgraduate

Institution Of The Thesis: Orta Doğu Teknik Üniversitesi, Faculty of Engineering, Department of Electrical and Electronics Engineering, Turkey

Approval Date: 2014


Supervisor: ŞİMŞEK DEMİR


Vacuum tubes are widely used microwave devices in many applications such as radar and telecommunication. Electron gun is very important component of a vacuum device since it generates electron beam into the device to interact with electromagnetic waves. Electron gun structures vary according to application and type of vacuum device. In order to design and simulate electron gun, Particle in Cell codes which solves the problems with charged particle motion, are used. In this thesis, various types of electron gun for Travelling Wave Tube are investigated. First, Pierce gun parametrical simulation is performed by CST PS Tracking Solver. Effects of simulation parameters are compared with respect to beam current, perveance, beam waist radius and beam waist position. After Pierce gun simulation, electron guns having special usage are simulated and optimized according to Pierce gun results. In this simulation, Pinto-Xavier-Motta, dual anode and annular beam electron gun was constructed and simulated in CST PS and their electron beam characteristics are examined.