NDLI: Stable 0.3-THz Gyrotron Backward-Wave Oscillator With a Tapered Coaxial Interaction Waveguide

Content Provider	IEEE Xplore Digital Library
Author	Chien-Lun Hung Nai-How Cheng
Copyright Year	1963
Abstract	Mode competition is a severe problem in the development of a high-power gyrotron backward-wave oscillator (gyro-BWO) in terahertz (THz) region. To improve the stability of this device, this paper investigates the possibility of using a tapered coaxial waveguide as the interaction structure of a 0.3-THz gyro-BWO. The inner cylinder rarefies the mode density near the operating mode. Moreover, tapering the wall of the outer cylinder suppresses almost all the competing modes and shifts the optimum magnetic tuning range of the operating mode under stable operating conditions. The gyro-BWO is predicted to stably generate a peak power of 17.2 kW with 11.5% efficiency at 0.307 THz, and a continuous tuning bandwidth of 3.4 GHz (≈1.1%) for a 30-kV, 5-A electron beam with α = 1.0 and an axial velocity spread of 5%. Compared with the uniform case, the tapered coaxial interaction waveguide enhances both the stability and the frequency tunability of the THz gyro-BWO.
Sponsorship	IEEE Electron Devices Society
Starting Page	1812
Ending Page	1817
Page Count	6
File Size	2333430
File Format	PDF
ISSN	00189383
Volume Number	61
Issue Number	6
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2014-01-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Magnetic resonance Oscillators Cyclotrons Cutoff frequency Harmonic analysis Tuning terahertz (THz). Coaxial waveguide gyrotron backward-wave oscillator (gyro-BWO) terahertz (THz)
Content Type	Text
Resource Type	Article
Subject	Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering

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