A model of plasma current through a hole of Rogowski probe including sheath effects

H. Furui, A. Ejiri, Y. Nagashima, Y. Takase, M. Sonehara, N. Tsujii, T. Yamaguchi, T. Shinya, H. Togashi, H. Homma, K. Nakamura, T. Takeuchi, S. Yajima, Y. Yoshida, K. Toida, W. Takahashi, H. Yamazaki

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    Abstract

    In TST-2 Ohmic discharges, local current is measured using a Rogowski probe by changing the angle between the local magnetic field and the direction of the hole of the Rogowski probe. The angular dependence shows a peak when the direction of the hole is almost parallel to the local magnetic field. The obtained width of the peak was broader than that of the theoretical curve expected from the probe geometry. In order to explain this disagreement, we consider the effect of sheath in the vicinity of the Rogowski probe. A sheath model was constructed and electron orbits were numerically calculated. From the calculation, it was found that the electron orbit is affected by E × B drift due to the sheath electric field. Such orbit causes the broadening of the peak in the angular dependence and the dependence agrees with the experimental results. The dependence of the broadening on various plasma parameters was studied numerically and explained qualitatively by a simplified analytical model.

    Original languageEnglish
    Article number043503
    JournalReview of Scientific Instruments
    Volume87
    Issue number4
    DOIs
    Publication statusPublished - Apr 2016

    All Science Journal Classification (ASJC) codes

    • Instrumentation

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    Furui, H., Ejiri, A., Nagashima, Y., Takase, Y., Sonehara, M., Tsujii, N., Yamaguchi, T., Shinya, T., Togashi, H., Homma, H., Nakamura, K., Takeuchi, T., Yajima, S., Yoshida, Y., Toida, K., Takahashi, W., & Yamazaki, H. (2016). A model of plasma current through a hole of Rogowski probe including sheath effects. Review of Scientific Instruments, 87(4), [043503]. https://doi.org/10.1063/1.4944941