The Design of Elliptical Sheet Beam Electron Gun

Sheet beam klystrons, like multi-beam klystrons, have many advantages such as decreased beam voltage, reduced power densities, lower voltage gradients and increased bandwidth (Basten and Booske, 1999). As a function of frequency, the power output of a sheet beam klystron falls only linearly with wavelength, making it more suitable for high frequency applications (Scheitrum, 2005; and Read et al., 2005). The generating, forming and focusing of electron beam is one of the key technologies of the sheet beam klystrons. Elliptical sheet beams are easy to focusing than rectangular sheet beams. The paper describes the considerations of designing elliptical sheet beam electron gun.