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An Experimental Investigation of a 0.8 THz Double-Beam Gyrotron

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Abstract

In this paper, we present and discuss the new experimental results that characterize the output parameters, and the overall performance of the recently developed 0.8 THz double-beam gyrotron operating at the second harmonic of the cyclotron frequency on the TE8,5 mode. Alongside with this design mode, several other resonances excited at both the fundamental and second harmonic operations in a wide frequency range have been studied. These experiments demonstrate that the usage of a double-beam electron-optical system opens more possibilities for realization of such regimes of operation that otherwise are not accessible in a conventional (single-beam) gyrotron due to a severe competition between the neighboring modes and the narrowness of the zones of a stable single mode operation. Most notably, the results prove that second harmonic operation at higher beam currents and respectively at higher levels of the output power are possible as expected from the preceding theoretical considerations and numerical studies. The results of this study are helpful for getting a better insight in the physics of the operation of the double-beam gyrotrons and suggest some possibilities for further optimization of both the design of the tube and the experimental setup.

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Funding

The modeling of the operation scenario and the computer-aided design of the electron-optical system was supported by RSF project 19-12-00141. The manufacturing of the tube and the experimental work at FIR UF were supported partially by the Special Fund for Education and Research from the Ministry of Education, Culture, Sports, Science and Technology (MEXT) in Japan, and SENTAN Project of the Japan Science and Technology Agency (JST).

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Authors and Affiliations

  1. Research Center for Development of Far-Infrared Region, University of Fukui, Fukui, 910-8507, Japan

    Seitaro Mitsudo, Eduard Khutoryan, Ilya Bandurkin, Teruo Saito, Yuya Ishikawa, Irina Zotova, Alexey Fedotov, Alexei Kuleshov, Svilen Sabchevski, Yoshinori Tatematsu & Toshitaka Idehara

  2. Institute of Applied Physics of the Russian Academy of Sciences, Nizhny Novgorod, Russia, 603950

    Mikhail Glyavin, Ilya Bandurkin, Vladimir Manuilov, Irina Zotova, Alexey Fedotov & Vladislav Zaslavsky

  3. O. Ya. Usikov Institute of Radiophisics and Electronics, National Academy of Sciences of Ukraine, Kharkov, 61000, Ukraine

    Eduard Khutoryan & Alexei Kuleshov

  4. Institute of Electronics of the Bulgarian Academy of Sciences, 1784, Sofia, Bulgaria

    Svilen Sabchevski

  5. Gyro Tech Ltd. Co., Fukui, 918-8550, Japan

    Toshitaka Idehara

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  1. Seitaro Mitsudo
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  2. Mikhail Glyavin
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  7. Vladimir Manuilov
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  8. Irina Zotova
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  11. Svilen Sabchevski
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  12. Yoshinori Tatematsu
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  13. Vladislav Zaslavsky
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  14. Toshitaka Idehara
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Correspondence to Svilen Sabchevski.

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Mitsudo, S., Glyavin, M., Khutoryan, E. et al. An Experimental Investigation of a 0.8 THz Double-Beam Gyrotron. J Infrared Milli Terahz Waves 40, 1114–1128 (2019). https://doi.org/10.1007/s10762-019-00629-6

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