Development of multi-purpose MW gyrotrons for fusion devices

R. Minami, T. Kariya, T. Imai, T. Numakura, Y. Endo, H. Nakabayashi, T. Eguchi, T. Shimozuma, S. Kubo, Y. Yoshimura, H. Igami, H. Takahashi, T. Mutoh, S. Ito, H. Idei, H. Zushi, Y. Yamaguchi, K. Sakamoto, Y. Mitsunaka

    Research output: Contribution to journalArticlepeer-review

    13 Citations (Scopus)


    The latest development achievements in the University of Tsukuba of over-1 MW power level gyrotrons required in present-day fusion devices, GAMMA 10, Large Helical Device (LHD), QUEST, Heliotron J and NSTX, are presented. The obtained maximum outputs are 1.9 MW for 0.1 s on the 77 GHz LHD tube and 1.2 MW for 1 ms on the 28 GHz GAMMA 10 one, which are new records in these frequency ranges. In long-pulse operation, 0.3 MW for 40 min at 77 GHz and 0.54 MW for 2 s at 28 GHz are achieved. A new programme of 154 GHz 1 MW development has started for high-density plasma heating in LHD. On the first 154 GHz tube, 1.0 MW for 1 s is achieved. As a next activity of the 28 GHz gyrotron, an over-1.5 MW gyrotron is designed and fabricated to study the multi-MW oscillation. The possibility of 0.4 MW continuous wave and 2 MW level output in operations of a few seconds, after the improvements of output window and mode converter, is shown. Moreover, a new design study of dual-frequency gyrotron at 28 and 35 GHz has started, which indicates the practicability of the multi-purpose gyrotron.

    Original languageEnglish
    Article number063003
    JournalNuclear Fusion
    Issue number6
    Publication statusPublished - Jun 2013

    All Science Journal Classification (ASJC) codes

    • Nuclear and High Energy Physics
    • Condensed Matter Physics


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