Enhancement of smith-purcell radiations by selfbunched electron beams in oversized backward wave oscillators

Author

Ogura, Kanayo ; Yambe, Kiyoyuki ; Iwasaki, Takuya ; Magori, Shota ; Kojima, Junpei

Author_Institution

Grad. Sch. of Sci. & Technol., Niigata Univ., Niigata, Japan

fYear

2014

fDate

25-29 May 2014

Firstpage

1

Lastpage

6

Abstract

Smith-Purcell (SP) radiations of weakly relativistic oversized backward wave oscillator (BWO) are examined experimentally. Our oversized BWOs are driven by weakly relativistic electron beams less than 100 keV. New element of this work is an enhancement of SP radiation in the oversized BWO using the bunching section. An annular beam is self-bunched in the K-band bunching section and then is injected into the oversized K-band BWO. SP radiations in the BWO are strongly enhanced in the U-band, which is about twice of the bunching frequency. Moreover, the oversized BWO is developed to G-band. By using the G-band bunching, the SP radiations are enhanced in the H-band. The enhancement of SP-radiation in the oversized BWO by the self-bunched electron beam is attractive to develop THz wave sources.

Keywords

backward wave oscillators; electron beams; microwave oscillators; particle beam bunching; G-band bunching; K-band BWO; K-band bunching section; SP radiations; Smith-Purcell radiations; THz wave sources; annular beam; backward wave oscillators; bunching frequency; relativistic electron beams; self-bunched electron beams; Cathodes; Corrugated surfaces; Cutoff frequency; Electron beams; K-band; Laser beams; Surface waves;

fLanguage

English

Publisher

ieee

Conference_Titel

Plasma Sciences (ICOPS) held with 2014 IEEE International Conference on High-Power Particle Beams (BEAMS), 2014 IEEE 41st International Conference on

Conference_Location

Washington, DC

Print_ISBN

978-1-4799-2711-1

Type

conf

DOI

10.1109/PLASMA.2014.7012770

Filename

7012770