Enhancements of Cherenkov Radiation by Two Electron Beams

Author

Liu, Wenxin ; Liu, Pu-Kun ; Yong, Wang ; Yang, Ziqiang

Author_Institution

Inst. of Electron., Beijing, China

Volume

40

Issue

3

fYear

2012

fDate

3/1/2012 12:00:00 AM

Firstpage

835

Lastpage

842

Abstract

An approach to the enhancement of Cherenkov radiation source driven by two electron beams (TEBs) is presented in this paper. The Cherenkov radiation source is composed of a cylindrical grating, and TEBs with a velocity separation are concentric and separated. By a field matched method, the dispersion equation is derived with a linearized fluid theory and solved by numerical calculation. The numerical results show that a considerable enhancement of growth rate is realized at an optimized voltage ratio due to two stream instability. Moreover, with a help of 2-D particle-in-cell simulations, the improvement of output power induced by the two stream instability is demonstrated, and the decreased of output power is observed as the increased distance of two electron beams.

Keywords

Cherenkov radiation; diffraction gratings; electron beams; 2D particle-in-cell simulations; Cherenkov radiation source; cylindrical grating; dispersion equation; field matched method; linearized fluid theory; stream instability; two electron beams; velocity separation; Dispersion; Electron beams; Equations; Gratings; Mathematical model; Plasmas; Power generation; Cherenkov radiation; dispersion equation; particle-in-cell simulation; two electron beams (TEBs);

fLanguage

English

Journal_Title

Plasma Science, IEEE Transactions on

Publisher

ieee

ISSN

0093-3813

Type

jour

DOI

10.1109/TPS.2011.2181423

Filename

6142112