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. Kojima; Sanae Itoh; K. Matsuoka; Y. Hamada; M. Fujiwara

doi:10.1088/0029-5515/41/5/310

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. KojimaSanae Itoh, K. Matsuoka, Y. Hamada, M. Fujiwara

Division of Nuclear Fusion Dynamics

Research output: Contribution to journal › Article › peer-review

11 Citations (Scopus)

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 n̄_e ≈ 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 language	English
Pages (from-to)	575-584
Number of pages	10
Journal	Nuclear Fusion
Volume	41
Issue number	5
DOIs	https://doi.org/10.1088/0029-5515/41/5/310
Publication status	Published - May 1 2001

All Science Journal Classification (ASJC) codes

Nuclear and High Energy Physics
Condensed Matter Physics

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10.1088/0029-5515/41/5/310

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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

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, 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

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title = "Observation of bifurcation properties of radial electric fields using a heavy ion beam probe",

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 {\=n}e ≈ 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.",

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

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doi = "10.1088/0029-5515/41/5/310",

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T1 - Observation of bifurcation properties of radial electric fields using a heavy ion beam probe

AU - Fujisawa, A.

AU - Iguchi, H.

AU - Minami, T.

AU - Yoshimura, Y.

AU - Sanuki, H.

AU - Itoh, K.

AU - Isobe, M.

AU - Nishimura, S.

AU - Suzuki, C.

AU - Tanaka, K.

AU - Osakabe, M.

AU - Nomura, I.

AU - Ida, K.

AU - Okamura, S.

AU - Toi, K.

AU - Kado, S.

AU - Akiyama, R.

AU - Shimizu, A.

AU - Takahashi, C.

AU - Kojima, M.

AU - Itoh, Sanae

AU - Matsuoka, K.

AU - Hamada, Y.

AU - Fujiwara, M.

PY - 2001/5/1

Y1 - 2001/5/1

N2 - 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.

AB - 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.

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DO - 10.1088/0029-5515/41/5/310

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AN - SCOPUS:0035353534

SN - 0029-5515

VL - 41

SP - 575

EP - 584

JO - Nuclear Fusion

JF - Nuclear Fusion

IS - 5

ER -

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

Abstract

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