10.4: Experimental demonstration of a W-band gyro-BWO using a helically corrugated waveguide

Author

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

Author_Institution

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

fYear

2010

fDate

18-20 May 2010

Firstpage

195

Lastpage

196

Abstract

The experimental demonstration of a W-band gyro-BWO using both thermionic cusp electron gun and helically corrugated waveguide will be presented. A cusp gun uses a non-adiabatic magnetic field reversal to obtain azimuthal motion on an electron beam resulting in an annular shaped, axis-encircling beam. The cusp gun was designed to generate a beam of 1.5A at 40kV with an adjustable velocity ratio of up to 3.0. The beam had a simulated axial velocity spread of ~8% and alpha spread of ~10%. The beam had an averaged radius of 0.35mm and beam thickness of 0.05mm which is ideal to drive sub-mm wave gyro-devices under investigation. The gyro-BWO has been constructed and designed to produce pulsed millimeter wave output radiation in the frequency range 84GHz to 104GHz.

Keywords

backward wave oscillators; electron guns; gyrotrons; helical waveguides; magnetic fields; millimetre wave oscillators; W-band gyro-BWO; azimuthal motion; current 1.5 A; frequency 84 GHz to 104 GHz; helically corrugated waveguide; non-adiabatic magnetic field; thermionic cusp electron gun; voltage 40 kV; Coils; Cyclotrons; Electron beams; Frequency; Gyrotrons; Helium; Magnetic fields; Physics; Pulse power systems; Voltage; Cusp; electron gun; gyrotron; millimeter-wave gyro-device;

fLanguage

English

Publisher

ieee

Conference_Titel

Vacuum Electronics Conference (IVEC), 2010 IEEE International

Conference_Location

Monterey, CA

Print_ISBN

978-1-4244-7098-3

Type

conf

DOI

10.1109/IVELEC.2010.5503535

Filename

5503535