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Design of a Second Harmonic Double-Beam Continuous Wave Gyrotron with Operating Frequency of 0.79 THz

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Abstract

This paper presents the most essential steps of a design study of a novel second harmonic gyrotron operating in CW (continuous wave) regime at a frequency of 0.79 THz and an output power of 1–100 W. It is based on a novel idea for suppression of the parasitic modes using a double-beam electron-optical system (EOS). It includes a triode magnetron injection gun (MIG), which forms two high-quality helical electron beams (HEB). Different schemes, namely one with two generating beams and another with one generating and one absorbing beam, have been investigated and compared. It has been shown that the scheme with two generating beams is more advantageous since it allows an effective suppression of the parasitic modes and a stable single-mode operation at the second harmonic resonance. A MIG which is appropriate for the realization of the latter scheme has been optimized using numerical codes for computer-aided design (CAD). It forms beams with practically equal pitch factors and moderate velocity spread. The construction of the gun is not sensitive to small misalignments and shifts of the electrodes and the magnetic field. Among the most promising characteristics of the presented design are an improved mode selection and a stable single-mode generation at currents that are two to three times higher than the currents in the single-beam (i.e., conventional) gyrotrons.

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Acknowledgments

This work was supported by RFBR grant 14-08-00334. The work of the Japan team was supported partially by the Special Fund for Education and Research from the Ministry of Education, Culture, Sports, Science and Technology (MEXT) in Japan and was carried out in the framework of the collaboration of an international consortium on the project “Promoting international collaboration for development and application of high-power THz gyrotrons” of the FIR UF Research Center (Fukui, Japan).

The authors are thankful to Prof. Gregory Nusinovich (Maryland Univ.) and Prof. Svilen Sabchevski (IRE BAS) for the useful discussions and help with the MS preparation.

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Authors and Affiliations

  1. Research Center for Development of Far-Infrared Region, University of Fukui (FIR UF), Bunkyo 3-9-1, Fukui, 910-8507, Japan

    V. N. Manuilov, M. Yu Glyavin & T. Idehara

  2. Radiophysical Department, Nizhny Novgorod State University, Gagarin av., 23, 690005, Nizhny Novgorod, Russia

    V. N. Manuilov & V. Yu Zaslavsky

  3. Institute of Applied Physics of the Russian Academy of Sciences (IAP RAS), 46 Ulyanov St., Nizhny Novgorod, 603600, Russia

    M. Yu Glyavin, A. S. Sedov & V. Yu Zaslavsky

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  1. V. N. Manuilov
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  2. M. Yu Glyavin
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  3. A. S. Sedov
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  4. V. Yu Zaslavsky
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  5. T. Idehara
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Correspondence to T. Idehara.

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Manuilov, V.N., Glyavin, M.Y., Sedov, A.S. et al. Design of a Second Harmonic Double-Beam Continuous Wave Gyrotron with Operating Frequency of 0.79 THz. J Infrared Milli Terahz Waves 36, 1164–1175 (2015). https://doi.org/10.1007/s10762-015-0209-x

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