C
Craig Robertson
Researcher at University of Strathclyde
Publications - 161
Citations - 1832
Craig Robertson is an academic researcher from University of Strathclyde. The author has contributed to research in topics: Microwave & Electron. The author has an hindex of 23, co-authored 149 publications receiving 1717 citations.
Papers
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Journal ArticleDOI
A cusp electron gun for millimeter wave gyrodevices
Craig R. Donaldson,Wenlong He,Adrian W. Cross,Fengping Li,Alan D. R. Phelps,Lei Zhang,Kevin Ronald,Craig Robertson,Colin G. Whyte,A. R. Young +9 more
TL;DR: In this paper, the experimental results of a thermionic cusp electron gun, used to drive millimeter and submillimeter wave harmonic gyrodevices, were reported using a "smooth" magnetic field reversal formed by two coils.
Journal ArticleDOI
Helically corrugated waveguide gyrotron traveling wave amplifier using a thermionic cathode electron gun
Adrian W. Cross,Wenlong He,Alan D. R. Phelps,Kevin Ronald,Colin G. Whyte,A. R. Young,Craig Robertson,E.G. Rafferty,J. Thomson +8 more
TL;DR: In this paper, an experimental operation of a gyrotron traveling wave amplifier with a helically corrugated waveguide using a thermionic cathode electron gun was presented, where the coupling between the second harmonic cyclotron mode of the gyrating electron beam and the radiation occurred in the region of near infinite phase velocity over a broad frequency band.
Journal ArticleDOI
Gyro-BWO experiments using a helical interaction waveguide
Wenlong He,Kevin Ronald,A. R. Young,Adrian W. Cross,Alan D. R. Phelps,Colin G. Whyte,E.G. Rafferty,J. Thomson,Craig Robertson,David Speirs,Sergey V. Samsonov,V. L. Bratman,Gregory G. Denisov +12 more
TL;DR: In this article, a helically corrugated waveguide was used for a gyrotron backward-wave oscillator (gyro-BWO) experiment and the output frequency was tuned by adjusting the magnetic field in the interaction cavity.
Journal ArticleDOI
Multi-Mode Coupling Wave Theory for Helically Corrugated Waveguide
Lei Zhang,Wenlong He,Kevin Ronald,Alan D. R. Phelps,Colin G. Whyte,Craig Robertson,A. R. Young,Craig R. Donaldson,Adrian W. Cross +8 more
TL;DR: In this article, multi-mode coupling wave equations were developed based on the perturbation method, which was then used to analyze a five-fold helically corrugated waveguide used for X-band microwave compression.
Journal ArticleDOI
Axis-encircling electron beam generation using a smooth magnetic cusp for gyrodevices
Wenlong He,Colin G. Whyte,E.G. Rafferty,Adrian W. Cross,Alan D. R. Phelps,Kevin Ronald,A. R. Young,Craig Robertson,Douglas C. Speirs,D.H. Rowlands +9 more
TL;DR: In this paper, an annular-shaped axis-encircling electron beam using a smooth magnetic cusp was studied through numerical simulations and experiments for harmonic operation of a gyrodevice.