Physical Review Special Topics. Accelerators and Beams (Jul 2009)
Electron beam requirements for Smith-Purcell backward wave oscillator with external focusing
Abstract
Operation of the Smith-Purcell backward wave oscillator requires a flat electron beam. Without the electron beam focusing, the requirement leads to a very stringent criterion on vertical emittance. In this paper, we discuss a way to relax the criterion by introducing an external focusing.