High-Efficiency Excitation of a Third-Harmonic Gyrotron

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...

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Bibliographic Details
Published inIEEE transactions on electron devices Vol. 62; no. 10; pp. 3399 - 3405
Main Authors Qi, Xiang-Bo, Du, Chao-Hai, Liu, Pu-Kun
Format Journal Article
LanguageEnglish
Published New York IEEE 01.10.2015
The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subjects
Cavity resonators
Couplings
Frequency-domain analysis
Gyrotron
Gyrotrons
Harmonic analysis
high efficiency
Manganese
mode competition
third harmonic
Time-domain analysis
high efficiency
third harmonic
Gyrotron
mode competition
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Summary: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.
ISSN:0018-9383
1557-9646
DOI:10.1109/TED.2015.2461657