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Development of Gyrotron FU CW GVII: a Second Harmonic, Multifrequency Gyrotron that Radiates Gaussian Beams

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Abstract

A sub-THz, second harmonic, multifrequency gyrotron, Gyrotron FU CW GVII, which radiates Gaussian beams, was developed. This device was designed to change the frequency in a stepwise manner in the range from 270 to 420 GHz. In this paper, we present the first experiments conducted using this gyrotron. Nine modes were selected for this study. The oscillation frequency of the selected modes was measured using a heterodyne system. The profiles of the Gaussian beams converted from the modes were assessed using an infrared camera, and the power of these beams was measured using a power meter. The oscillations of the nine second harmonic modes were successfully measured, and Gaussian beams converted from seven oscillation modes were observed. Four second harmonic modes, TE8,5, TE6,5, TE5,4, and TE2,6, oscillated in a single mode. The power of the beams ranged from 0.2 to 77 W. Even in the case of spurious oscillation of fundamental modes, the beams converted from the second harmonic modes could be separated from the fundamental mode beams by taking advantage of the different radiation directions emitted through the gyrotron window.

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Acknowledgments

The lead author would like to thank Prof. Yukihisa Suzuki and Dr. Maya Mizuno for their support in the calibration of the power meter.

Funding

This work was partly supported by a special fund for research projects from the Ministry of Education, Culture, Sports, Science and Technology of Japan and by JSPS KAKENHI (Grant Number: 17K05725).

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Authors and Affiliations

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

    Yoshinori Tatematsu, Yuusuke Yamaguchi, Masafumi Fukunari, Kyoya Takayama, Yuto Maeda, Tatsuya Ueyama, Taisei Ogura, Kazuki Nakagawa, Ryota Kamiya, Shingo Ito, Ryotaro Okamoto & Teruo Saito

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  1. Yoshinori Tatematsu
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  2. Yuusuke Yamaguchi
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Correspondence to Yoshinori Tatematsu.

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Tatematsu, Y., Yamaguchi, Y., Fukunari, M. et al. Development of Gyrotron FU CW GVII: a Second Harmonic, Multifrequency Gyrotron that Radiates Gaussian Beams. J Infrared Milli Terahz Waves 41, 576–589 (2020). https://doi.org/10.1007/s10762-020-00681-7

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