Simultaneous evaluation of potential fluctuation from the core plasma to the end region in GAMMA 10

M. Yoshikawa, M. Sakamoto, Y. Miyata, M. Aoyama, M. Mizuguchi, M. Hirata, M. Ichimura, T. Imai, T. Kariya, I. Katanuma, J. Kohagura, R. Minami, Y. Nakashima, T. Numakura, R. Ikezoe, K. Ichimura, K. Furutachi, H. Nakanishi, Y. Nagayama

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9 Citations (Scopus)


A correlation between drift-type fluctuations and anomalous radial transport was observed in GAMMA 10, and these fluctuations were suppressed by the electron-cyclotron-heating-driven radial electric field. We developed new diagnostics to conduct these studies: a simultaneous two-point-measurement gold neutral beam probe (GNBP) for the radial electric field and potential fluctuations, and a high-speed end-plate potential fluctuation measurement system. The electric field and its fluctuations were successfully obtained in a single plasma shot for the first time. Coherence between the drift-type potential fluctuations measured in the core plasma by the GNBP and those obtained by end-plate measurements was clearly observed. These potential and electric field fluctuations were clearly suppressed by the positive electric fields measured by two-point potential measurements using the GNBP and the end-plate system. We can obtain a powerful tool for probing the radial electric field and potential fluctuations in the core plasma because the end-plate potential fluctuation is the same as that in the core plasma measured using the new GNBP.

Original languageEnglish
Article number073031
JournalNuclear Fusion
Issue number7
Publication statusPublished - Jul 2013
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics
  • Condensed Matter Physics


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