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

Research output: Contribution to journalArticle

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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

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heavy ions
ion beams
electric fields
probes
profiles
histograms
fine structure
shear

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics
  • Condensed Matter Physics

Cite this

Fujisawa, A., Iguchi, H., Minami, T., Yoshimura, Y., Sanuki, H., Itoh, K., ... 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

Observation of bifurcation properties of radial electric fields using a heavy ion beam probe. / 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.; Kojima, M.; Itoh, S. I.; Matsuoka, K.; Hamada, Y.; Fujiwara, M.

In: Nuclear Fusion, Vol. 41, No. 5, 01.05.2001, p. 575-584.

Research output: Contribution to journalArticle

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, Kojima, M, Itoh, SI, Matsuoka, K, Hamada, Y & Fujiwara, M 2001, 'Observation of bifurcation properties of radial electric fields using a heavy ion beam probe', Nuclear Fusion, vol. 41, no. 5, pp. 575-584. https://doi.org/10.1088/0029-5515/41/5/310
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. ; Kojima, M. ; Itoh, S. I. ; Matsuoka, K. ; Hamada, Y. ; Fujiwara, M. / Observation of bifurcation properties of radial electric fields using a heavy ion beam probe. In: Nuclear Fusion. 2001 ; Vol. 41, No. 5. pp. 575-584.
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AU - Minami, T.

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AU - Sanuki, H.

AU - Itoh, K.

AU - Isobe, M.

AU - Nishimura, S.

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AU - Shimizu, A.

AU - Takahashi, C.

AU - Kojima, M.

AU - Itoh, S. I.

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