Observation of bifurcation properties of radial electric fields using a heavy ion beam probe

A. Fujisawa, H. Iguchi, T. Minami, Y. Yoshimura, H. Sanuki, K. Itoh, M. Isobe, S. Nishimura, C. Suzuki, K. Tanaka, M. Osakabe, I. Nomura, K. Ida, S. Okamura, K. Toi, S. Kado, R. Akiyama, A. Shimizu, C. Takahashi, M. KojimaS. I. Itoh, K. Matsuoka, Y. Hamada, M. Fujiwara

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Abstract

The bifurcated nature of the potential profile of a toroidal helical plasma is investigated in CHS using a heavy ion beam probe. The measurements reveal that three main branches of potential profile exist in ECR heated plasmas with a low density of n̄e ≈ 0.5 × 1019 m-3. The branches with higher central potential exhibit a rather strong radial electric field shear that should result in fluctuation reduction and formation of a transport barrier. An analysis of the pulsating behaviour in the potential suggests the existence of a fine structure in the potential profiles between the main branches. Lissajous and histogram expressions are useful in extracting the bifurcation characteristics of the potential structure.

Original languageEnglish
Pages (from-to)575-584
Number of pages10
JournalNuclear Fusion
Volume41
Issue number5
DOIs
Publication statusPublished - May 1 2001

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics
  • Condensed Matter Physics

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    Fujisawa, A., Iguchi, H., Minami, T., Yoshimura, Y., Sanuki, H., Itoh, K., Isobe, M., Nishimura, S., Suzuki, C., Tanaka, K., Osakabe, M., Nomura, I., Ida, K., Okamura, S., Toi, K., Kado, S., Akiyama, R., Shimizu, A., Takahashi, C., ... Fujiwara, M. (2001). Observation of bifurcation properties of radial electric fields using a heavy ion beam probe. Nuclear Fusion, 41(5), 575-584. https://doi.org/10.1088/0029-5515/41/5/310