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Development of second harmonic gyrotrons, Gyrotron FU CW GII and Gyrotron FU CW GIII, equipped with internal mode converters

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Abstract

Second harmonic gyrotrons, Gyrotron FU CW GII and Gyrotron FU CW GIII, were developed at the Research Center for Development of Far-Infrared Region, University of Fukui, Japan to achieve two goals. Each gyrotron was equipped with an internal quasi-optical mode converter. Using Gyrotron FU CW GII allowed the design of the cavity and mode converter to be validated, which was the first goal. After that, Gyrotron FU CW GIII, which is an improved version of Gyrotron FU CW GII, allowed us to achieve a high power output of up to 420 W, which was the second goal, with a cathode voltage setting of −21 kV and a beam current of 0.57 A. This was achieved using a newly developed electron gun and with the careful sitting of the gyrotron on the magnet.

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Acknowledgement

This work was partly supported by a special fund for research projects from the Ministry of Education, Science, Sports and Culture of Japan.

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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, Toshitaka Idehara, Tatsuru Kawase, Ryoichi Ichioka, Isamu Ogawa & Teruo Saito

  2. Institute for Protein Research, Osaka University, Osaka, 565-0871, Japan

    Toshimichi Fujiwara

Authors
  1. Yoshinori Tatematsu
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  2. Yuusuke Yamaguchi
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  3. Toshitaka Idehara
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  4. Tatsuru Kawase
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  5. Ryoichi Ichioka
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  6. Isamu Ogawa
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  7. Teruo Saito
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  8. Toshimichi Fujiwara
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Correspondence to Yoshinori Tatematsu.

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Tatematsu, Y., Yamaguchi, Y., Idehara, T. et al. Development of second harmonic gyrotrons, Gyrotron FU CW GII and Gyrotron FU CW GIII, equipped with internal mode converters. J Infrared Milli Terahz Waves 35, 169–178 (2014). https://doi.org/10.1007/s10762-014-0048-1

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  • DOI: https://doi.org/10.1007/s10762-014-0048-1

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