Experimental study on the high-order mode oscillation in a four-cavity intense relativistic klystron amplifier

The high-order mode oscillation is studied in designing a four-cavity intense relativistic klystron amplifier(IRKA). The reason of the oscillation caused by high-order modes and a method to suppress this kind of spurious modes are found through theoretical analyses and the study on the influence of...

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Published in2017 42nd International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz) pp. 1 - 2
Main Authors Liu Ying-hui, Niu Xin-jian, Wang Hui, Guo Guo
Format Conference Proceeding
LanguageEnglish
Published IEEE 01.08.2017
Subjects
Cavity resonators
Gain
Klystrons
Microwave amplifiers
Microwave oscillators
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Summary:The high-order mode oscillation is studied in designing a four-cavity intense relativistic klystron amplifier(IRKA). The reason of the oscillation caused by high-order modes and a method to suppress this kind of spurious modes are found through theoretical analyses and the study on the influence of major parameters of a high frequency structure (such as, the oscillation frequency of cavities, the cavity Q value, the length of drift tube section and the characteristic impedance etc.). Based on much simulation, a four-cavity Intense Relativistic Klystron Amplifier with a superior performance has been designed, built and tested. An output power of 2.22 GW corresponding to 27.4% efficiency and 61 dB gain has been obtained. Moreover, the high-order mode oscillation is suppressed effectively, And an output power of 1.95 GW corresponding to 26% efficiency and 62 dB gain has been obtained in the laboratory.
ISSN:2162-2035
DOI:10.1109/IRMMW-THz.2017.8067067