@article {25300,
	title = {Controllable thermal-frequency tuning of a THz gyrotron},
	journal = {IEEE Trans. Electron Devices},
	volume = {65},
	year = {2018},
	pages = {695-703},
	abstract = {Gyrotron performance is sensitive to cavity structure parameters, and the cavity shape is temperature dependent due to thermal deformation induced by temperature rise from ohmic loss power on finite-conductivity cavity wall. Accordingly, this paper studies a frequency-tuning scheme for terahertz gyrotron by properly controlling the cavity thermal deformation. By combining gyrotron nonlinear theory and finite-element method software, controllable thermal-frequency-tuning capability of a continuous-wave 263-GHz gyrotron is systematically investigated, toward maintaining gyrotron operating under gyromonotron condition in frequency-tuning band, and achieving high efficiency in broadband frequency-tuning range. After studying cavity thermal distribution, structure deformation, and electron beam-wave interaction, an optimized cavity structure with transition sections on both ends is proposed. Simulation predicts that with the two-transition-section cavity, via additional thermal tuning, the continuous-frequency-tuning band is capable of reaching 1.75 GHz, which is 5 times of the initial bandwidth. Furthermore, using the thermal-frequency-tuning technology, impressive high efficiency above 17\% is obtainable in the whole frequency-tuning range.},
	url = {https://ieeexplore.ieee.org/document/8240959/},
	author = {Li Luo and Chao-Hai Du* and Xiang-Bo Qi and Zheng-Di Li and Shi Pan and Ming-Guang Huang and Pu-Kun Liu*}
}
