Development of 28 GHz Gyrotron for Cooperative ECH Study

T. Kariya, R. Minami, T. Imai, T. Kato, H. Idei, K. Hanada, H. Zushi, T. Numakura, Y. Endo, M. Ichimura

    Research output: Contribution to journalArticlepeer-review

    5 Citations (Scopus)


    At the Plasma Research Center at University of Tsukuba, development of megawatt gyrotrons is being performed as a collaborative electron cyclotron heating (ECH) study with some research organizations. A 28 GHz 1 MW 1 s gyrotron has been developed to upgrade the GAMMA 10/PDX ECH systems. To improve the oscillation efficiency in high current regions, the magnetron injection gun (MIG) of the 28 GHz gyrotron has been modified. Output power of 1.25 MW has been achieved with this gyrotron. For the first step of the collaborative research between Tsukuba University and Kyushu University, the Tsukuba 28 GHz gyrotron was adapted to the Q-shu University Experiment with Steady-State Spherical Tokamak (QUEST) ECH system, and the plasma heating and current drive effect were demonstrated. We obtained successful results, including an electron cyclotron-driven plasma current of 66 kA in the QUEST plasma experiment. For the next step of the collaborative research, the design targets of a 2 MW 3 s and 0.4 MW continuous wave have been achieved in a design study of a new 28 GHz gyrotron.

    Original languageEnglish
    Pages (from-to)147-151
    Number of pages5
    JournalFusion Science and Technology
    Issue number1
    Publication statusPublished - Jul 1 2015

    All Science Journal Classification (ASJC) codes

    • Civil and Structural Engineering
    • Nuclear and High Energy Physics
    • Nuclear Energy and Engineering
    • Materials Science(all)
    • Mechanical Engineering


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