@article {12774,
	title = {High-efficiency excitation of a third harmonic gyrotron},
	journal = {IEEE Transactions on Electron Devices},
	volume = {62},
	year = {2015},
	pages = {3399-3405},
	abstract = {High-harmonic gyrotrons are challenging to generate high interaction efficiency and simultaneously suppress the mode competition. Investigation in this paper reveals that a high-Q cavity is potential to realize high efficiency in a 94-GHz third-harmonic TE02 mode gyrotron. Unfortunately, the high-Q cavity exhibits severe mode competition from the lower harmonic modes. A start-up scenario of active parameter control is employed to suppress the mode competition. The third-harmonic TE02 mode gyrotron finally achieves the steady single-mode operation with efficiency up to 20\%. The physical mechanism during the mode formation process is theoretically investigated according to frequency-domain and time-domain nonlinear theories. The theoretical investigation in this paper is of guidance for future developing high-harmonic gyrotrons, especially toward terahertz applications.},
	url = {http://ieeexplore.ieee.org/xpls/abs_all.jsp?arnumber=7182771},
	author = {Xiang-Bo Qi and Chao-Hai Du and Pu-Kun Liu}
}
