High-power, tunable source of coherent THz radiation driven by a microbunched electron beam

Abstract

Pre-bunched" or "microbunched" charged particle beams have attracted significant interest in the last decade. Potential applications of such beams include development of the next generation of THz and X-ray light sources. This work presents the conceptual design of a tunable source of coherent Smith-Purcell THz radiation based on plasma-assisted pre-modulation of the continuous beam, and conditioning of the micro-bunched beam. The numerical simulations were carried out from the beam modulation to THz radiation generation using a self-consistent numerical model as well as a semi-analytical approach. Such a source would be a possible and useful alternative to conventional vacuum THz tubes and THz FEL sources.

Impact of space charge effects on ultrafast electron beam longitudinal profile diagnostics based on SPR

“…As a type of diffractive radiation, cSPr typically does not affect the beam's trajectory. This property makes cSPr suitable for developing diagnostic techniques that accurately measure the longitudinal profile of the beam, as it is less affected by external factors [9][10] . Benefiting from the high-gradient acceleration field provided by the 1.4-cell RF photocathode electron gun, the length of the electron bunch with high charge can be reduced to the femtosecond level.…”