Updates on a W-band Gyro-BWO using a helically corrugated waveguide experiment

Author

Donaldson, Craig R. ; He, Wenlong ; Zhang, Liang ; Cross, Adrian W. ; Li, Fengping ; Phelps, Alan D R ; Ronald, Kevin ; Robertson, Craig W. ; Whyte, Colin G. ; McElhinney, P.

Author_Institution

Dept. of Phys., Univ. of Strathclyde, Glasgow, UK

fYear

2012

fDate

24-26 April 2012

Firstpage

217

Lastpage

218

Abstract

The experimental demonstration of a W-band gyrotron backward-wave oscillator (gyro-BWO) using both thermionic cusp electron gun and helically corrugated waveguide will be presented. The cusp gun is designed to generate an axis-encircling electron beam of 1.5 A at 40 kV with an adjustable velocity ratio of up to 3.0. The beam had a simulated axial velocity spread (Δv_z/v_z) of ~8% and alpha spread (Δ α /α) of ~10%. The beam had an averaged radius of 0.35 mm and beam thickness of 0.05 mm which is ideal to drive sub-mm wave gyro-devices under investigation. The gyro-BWO has been experimentally measured and the latest results will be presented.

Keywords

backward wave oscillators; electron beams; electron guns; helical waveguides; millimetre wave oscillators; thermionic emission; W-band gyro-BWO; alpha spread; axis-encircling electron beam; backward-wave oscillator; current 1.5 A; helically corrugated waveguide; simulated axial velocity spread; size 0.05 mm; sub-mm wave gyro-devices; thermionic cusp electron gun; voltage 40 kV; Dispersion; Electron beams; Frequency measurement; Harmonic analysis; Helium; Tuning; Voltage measurement; Cusp; electron gun; gyro-BWO; gyrotron backward-wave oscillator; helically corrugated waveguide; millimeter-wave gyro-device;

fLanguage

English

Publisher

ieee

Conference_Titel

Vacuum Electronics Conference (IVEC), 2012 IEEE Thirteenth International

Conference_Location

Monterey, CA

Print_ISBN

978-1-4673-0188-6

Electronic_ISBN

978-1-4673-0187-9

Type

conf

DOI

10.1109/IVEC.2012.6262136

Filename

6262136