Design and implementation of a low emittance high power thermionic DC electron gun

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2021-2-8

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Sezer, Mustafa

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In this thesis, a thermionic electron gun generating low emittance and the high power electron beam is designed. The thermionic cathode made of a LaB6 single crystal is chosen as a thermionic emitter because of its properties ensuring high electron beam current in lower temperatures which provide lower emittance. The main goal of the gun design is to achieve a high DC beam current and low emittance. Computer Sim- ulation Technology (CST) and MATLAB are used to design the gun and optimize electrode shapes and corresponding fields. In addition, control and regulation of elec- tron beam current are carried out by a focusing and control electrode in an electron gun at CST. From no current to full current, this current control is provided in every voltage step without increasing the beam’s emittance value. The electron gun is kept under a high voltage DC source which varies between -60kV to -100 kV and DC beam current up to 75 mA. The simulation and test results are presented.

Subject Keywords

DC electron gun, Electron beam, Focusing and control electrode, Low emit- tance, Thermionic cathode

URI

https://hdl.handle.net/11511/89613

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Graduate School of Natural and Applied Sciences, Thesis

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Citation Formats

M. Sezer, “Design and implementation of a low emittance high power thermionic DC electron gun,” M.S. - Master of Science, Middle East Technical University, 2021.