Measurement of electrostatic potential fluctuation using heavy ion beam probe in large helical device

Takeshi Ido, Akihiro Shimizu, Masaki Nishiura, Haruhisa Nakano, Shinsuke Ohshima, Shinji Kato, Yasuji Hamada, Yasuo Yoshimura, Shin Kubo, Takashi Shimozuma, Hiroe Igami, Hiromi Takahashi, Kazuo Toi, Fumitake Watanabe

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Abstract

Heavy ion beam probe (HIBP) for large helical device (LHD) has been improved to measure the potential fluctuation in high-temperature plasmas. The spatial resolution is improved to about 10 mm by controlling the focus of a probe beam. The HIBP is applied to measure the potential fluctuation in plasmas where the rotational transform is controlled by electron cyclotron current drive. The fluctuations whose frequencies change with the time constant of a few hundreds of milliseconds and that with a constant frequency are observed. The characteristics of the latter fluctuation are similar to those of the geodesic acoustic mode oscillation. The spatial profiles of the fluctuations are also obtained.

Original languageEnglish
Article number10F318
JournalReview of Scientific Instruments
Volume79
Issue number10
DOIs
Publication statusPublished - Nov 10 2008

All Science Journal Classification (ASJC) codes

  • Instrumentation

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    Ido, T., Shimizu, A., Nishiura, M., Nakano, H., Ohshima, S., Kato, S., Hamada, Y., Yoshimura, Y., Kubo, S., Shimozuma, T., Igami, H., Takahashi, H., Toi, K., & Watanabe, F. (2008). Measurement of electrostatic potential fluctuation using heavy ion beam probe in large helical device. Review of Scientific Instruments, 79(10), [10F318]. https://doi.org/10.1063/1.2971207