Abstract- Development of electron-optical system with three elliptic electron beams for a THz-band vacuum-tube device

 Igor A. Navrotsky ;  Anton A. Burtsev, Alexander Y. Kivokurtsev,  Kirill V. Shumikhin,  Pavel D. Shalaev,   Tatiana A. Karetnikova,  Nikita M Ryskin,

http://ieeexplore.ieee.org/document/8068467/

The results of design, simulation, and experimental testing of an electron-optical system with three elliptic electron beams are presented. Total beam current is 93 mA. The beams are focused by a PPM system with 0.55 T magnitude of the magnetic field. Beam transmission in a rectangular tunnel at over 25 mm distance is demonstrated. The developed electron optical system is assumed to be used in sub-THz-band vacuum-tube devices such as O-type traveling-wave tube or backward-wave oscillator. Electromagnetic parameters of a double-grating staggered slow-wave structure are calculated.