NDLI: Theory and Experiment of a W-Band Tunable Gyrotron Oscillator

Content Provider	IEEE Xplore Digital Library
Author	Chao-Hai Du Xiang-Bo Qi Pu-Kun Liu Tsun-Hsu Chang Shou-Xi Xu Zhi-Hui Geng Bao-Liang Hao Liu Xiao Gao-Feng Liu Zheng-Di Li Shao-Hui Shi Hu Wang
Copyright Year	1963
Abstract	A gyrotron capable of both frequency and power tuning is a promising coherent millimeter-THz wave source. A self-consistent nonlinear theory is applied to investigate the electron cyclotron interaction between electron beam and wave modes of axial nonfixed profiles in an extended W-band TE₀₁ mode cylindrical cavity. It is revealed that tuning the magnetic field strength can excite electron cyclotron resonances on forward wave, backward wave, and even simultaneous on both waves, which makes the system operate under distinctive states, namely the gyrotron backward wave oscillation state and the gyromonotron state. In this paper, a W-band prototype gyrotron oscillator based on an extended cylindrical waveguide cavity is built, and the experiment test indicates that the system starts oscillation in a relative wide range of the operation parameters. The measured frequency spectrum reveals the system iteratively switches between the lower order instability axial modes, and it operates under nonstationary oscillation states. The experimental measurement of highest output power ~8 kW is consistent with the theoretical predictions. An optimized gyrotron circuit with efficiency exceeding 20% and tunable bandwidth over 10 GHz is also presented. The free oscillation behaviors revealed in this paper provide interesting guidance for developing tunable gyrotrons in millimeter-THz wave range.
Sponsorship	IEEE Electron Devices Society
Starting Page	1781
Ending Page	1788
Page Count	8
File Size	1290417
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	Gyrotrons Cavity resonators Tuning Electron beams Magnetic resonance Oscillators Magnetic domains instability competition. Broadband tuning electron cyclotron maser gyrotron instability competition
Content Type	Text
Resource Type	Article
Subject	Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering

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