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W. He *, C. R. Donaldson, F. Li, L. Zhang, A. W. Cross, A. D. R. Phelps, K. Ronald, C. W. Robertson, C. G. Whyte, A. R. Young
SUPA, Department of Physics, University of Strathclyde,
Glasgow, G4 0NG, Scotland, UK
* Email: w.he@strath.ac.uk
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Abstract: This paper presents the design and simulation of W-band Gyro-devices using helically corrugated waveguides as the beam-wave interaction region and a cusp gun as the electron beam source. The electron beam system and the beam-wave interaction were optimized through numerical simulations by using a particle-in-cell (PIC) code MAGIC to predict (calculate) the output power and frequency bandwidth. The beam cross sectional measurement using a scintillator plate confirmed that an axis encircling electron beam was achieved with the designed beam parameters of current 1.5 A and energy 40 keV. The W-band helically corrugated interaction region for the gyrotron backward wave oscillator (Gyro-BWO) was manufactured with a dispersion from 80 GHz to 110 GHz measured using a vector network analyser which was found to be in good agreement with simulations and theory. The Gyro-BWO achieved frequency-tuneable operation by adjusting the magnetic field in the interaction cavity. A -3 dB bandwidth of ~84-104 GHz and output power ~10 kW were simulated using the electron beam from the cusp gun. The gyrotron travelling wave amplifier (Gyro-TWA) is designed to have a 3 dB frequency bandwidth of 90-100 GHz, output power of 10 kW and saturated amplification gain of 40 dB.
Keywords: Gyro-devices, Gyro-BWO, Gyro-TWA, Helically Corrugated Waveguide, Cusp Gun.
Received: 2010-11-18
Published: 2011-3-31
Cite this article:
W. He, C. R. Donaldson, F. Li, L. Zhang, A. W. Cross, A. D. R. Phelps, K. Ronald, C. W. Robertson, C. G. Whyte, A. R. Young.(Invited Paper) W-band Gyro-devices Using Helically Corrugated Waveguide and Cusp Gun: Design, Simulation and Experiment[J]. International Journal of Terahertz Science and Technology, 2011, Vol.4, No.1: 9-19. DOI:10.11906/TST.009-019.2011.03.02
URL: http://www.tstnetwork.org/10.11906/TST.009-019.2011.03.02
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