Development of a local current diagnostic using a small Rogowski coil for a spherical tokamak plasma in TST-2

Hirokazu Furui, Yoshihiko Nagashima, Yuich Takase, Akira Ejiri, Hidetoshi Kakuda, Masateru Sonehara, Takuya Oosako, Naoto Tsujii, Junichi Hiratsuka, Kazuhiro Imamura, Takuma Inada, Keishun Nakamura, Ayaka Nakanishi, Takahiro Shinya, Hiro Togashi, Shintarou Tsuda, Takuma Wakatsuki, Takashi Yamaguchi

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    Abstract

    A local current diagnostic using a small Rogowski coil was developed in the TST-2 spherical tokamak device (R = 0.38 m, a = 0.25 m, Bt = 0.3 T, Ip = 0.1 MA). A Rogowski coil is a cost effective tool for local current diagnostic that can detect the current signal directly. A new small Rogowski coil (outer diameter = 20 mm, inner diameter = 12 mm, number of turns = 360) with small sensitivity to external magnetic fields, such as Bt and Bp, was developed and successfully installed in the TST-2. The measured local current at the edge just inside the last closed flux surface for ohmic heating was about 15 A.

    Original languageEnglish
    Article number3402078
    JournalPlasma and Fusion Research
    Volume9
    Issue numberSpecialIssue2
    DOIs
    Publication statusPublished - 2014

    All Science Journal Classification (ASJC) codes

    • Condensed Matter Physics

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  • Cite this

    Furui, H., Nagashima, Y., Takase, Y., Ejiri, A., Kakuda, H., Sonehara, M., Oosako, T., Tsujii, N., Hiratsuka, J., Imamura, K., Inada, T., Nakamura, K., Nakanishi, A., Shinya, T., Togashi, H., Tsuda, S., Wakatsuki, T., & Yamaguchi, T. (2014). Development of a local current diagnostic using a small Rogowski coil for a spherical tokamak plasma in TST-2. Plasma and Fusion Research, 9(SpecialIssue2), [3402078]. https://doi.org/10.1585/pfr.9.3402078