Radial electric field and transport near the rational surface and the magnetic island in LHD

K. Ida, Inagaki Shigeru, N. Tamura, T. Morisaki, N. Ohyabu., K. Khlopenkov, S. Sudo, K. Watanabe, M. Yokoyama, T. Shimozuma, Y. Takeiri, K. Itoh, M. Yoshinuma, Y. Liang, K. Narihara, K. Tanaka, Y. Nagayama, T. Tokuzawa, K. Kawahata, H. Suzuki & 65 others A. Komori, T. Akiyama, N. Ashikawa, M. Emoto, H. Funaba, P. Goncharov, M. Goto, Hiroshi Idei, K. Ikeda, M. Isobe, O. Kaneko, H. Kawazome, T. Kobuchi, A. Kostrioukov, S. Kubo, R. Kumazawa, S. Masuzaki, T. Minami, J. Miyazawa, S. Morita, S. Murakami, S. Muto, T. Mutoh, Y. Nakamura, H. Nakanishi, Y. Narushima, K. Nishimura, N. Noda, T. Notake, H. Nozato, S. Ohdachi, Y. Oka, M. Osakabe, T. Ozaki, B. J. Peterson, A. Sagara, T. Saida, K. Saito, S. Sakakibara, R. Sakamoto, M. Sasao, K. Sato, M. Sato, T. Seki, M. Shoji, N. Takeuchi, K. Toi, Y. Torii, K. Tsumori, T. Watari, Y. Xu, H. Yamada, I. Yamada, S. Yamamoto, T. Yamamoto, Y. Yoshimura, I. Ohtake, K. Ohkubo, T. Mito, T. Satow, T. Uda, K. Yamazaki, K. Matsuoka, O. Motojima, M. Fujiwara

Research output: Contribution to journalArticle

44 Citations (Scopus)

Abstract

The structure of the radial electric field and heat transport at the magnetic island in the large helical device (LHD) are investigated by measuring the radial profile of the poloidal flow with charge exchange spectroscopy and measuring the time evolution of the electron temperature with ECE. A vortex-like plasma flow along the magnetic flux surface inside the magnetic island is observed when the n/m = 1/1 external perturbation field becomes large enough to increase the magnetic island width above a critical range (15-20% of minor radius) in LHD. This convective poloidal flow results in a non-flat space potential inside the magnetic island. The sign of the curvature of the space potential (∂2Φ/∂r2, where Φ is the space potential) depends on the radial electric field at the boundary of the magnetic island. The heat transport inside the magnetic island is studied with a cold pulse propagation technique. The experimental results show the existence of radial electric field shear at the boundary of the magnetic island and a reduction in heat transport at the boundary and inside the magnetic island.

Original languageEnglish
Pages (from-to)290-295
Number of pages6
JournalNuclear Fusion
Volume44
Issue number2
DOIs
Publication statusPublished - Feb 1 2004

Fingerprint

magnetic islands
electric fields
heat
magnetohydrodynamic flow
charge exchange
magnetic flux
curvature
vortices
electron energy
shear
perturbation
radii
propagation
profiles
pulses

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics
  • Condensed Matter Physics

Cite this

Ida, K., Shigeru, I., Tamura, N., Morisaki, T., Ohyabu., N., Khlopenkov, K., ... Fujiwara, M. (2004). Radial electric field and transport near the rational surface and the magnetic island in LHD. Nuclear Fusion, 44(2), 290-295. https://doi.org/10.1088/0029-5515/44/2/010

Radial electric field and transport near the rational surface and the magnetic island in LHD. / Ida, K.; Shigeru, Inagaki; Tamura, N.; Morisaki, T.; Ohyabu., N.; Khlopenkov, K.; Sudo, S.; Watanabe, K.; Yokoyama, M.; Shimozuma, T.; Takeiri, Y.; Itoh, K.; Yoshinuma, M.; Liang, Y.; Narihara, K.; Tanaka, K.; Nagayama, Y.; Tokuzawa, T.; Kawahata, K.; Suzuki, H.; Komori, A.; Akiyama, T.; Ashikawa, N.; Emoto, M.; Funaba, H.; Goncharov, P.; Goto, M.; Idei, Hiroshi; Ikeda, K.; Isobe, M.; Kaneko, O.; Kawazome, H.; Kobuchi, T.; Kostrioukov, A.; Kubo, S.; Kumazawa, R.; Masuzaki, S.; Minami, T.; Miyazawa, J.; Morita, S.; Murakami, S.; Muto, S.; Mutoh, T.; Nakamura, Y.; Nakanishi, H.; Narushima, Y.; Nishimura, K.; Noda, N.; Notake, T.; Nozato, H.; Ohdachi, S.; Oka, Y.; Osakabe, M.; Ozaki, T.; Peterson, B. J.; Sagara, A.; Saida, T.; Saito, K.; Sakakibara, S.; Sakamoto, R.; Sasao, M.; Sato, K.; Sato, M.; Seki, T.; Shoji, M.; Takeuchi, N.; Toi, K.; Torii, Y.; Tsumori, K.; Watari, T.; Xu, Y.; Yamada, H.; Yamada, I.; Yamamoto, S.; Yamamoto, T.; Yoshimura, Y.; Ohtake, I.; Ohkubo, K.; Mito, T.; Satow, T.; Uda, T.; Yamazaki, K.; Matsuoka, K.; Motojima, O.; Fujiwara, M.

In: Nuclear Fusion, Vol. 44, No. 2, 01.02.2004, p. 290-295.

Research output: Contribution to journalArticle

Ida, K, Shigeru, I, Tamura, N, Morisaki, T, Ohyabu., N, Khlopenkov, K, Sudo, S, Watanabe, K, Yokoyama, M, Shimozuma, T, Takeiri, Y, Itoh, K, Yoshinuma, M, Liang, Y, Narihara, K, Tanaka, K, Nagayama, Y, Tokuzawa, T, Kawahata, K, Suzuki, H, Komori, A, Akiyama, T, Ashikawa, N, Emoto, M, Funaba, H, Goncharov, P, Goto, M, Idei, H, Ikeda, K, Isobe, M, Kaneko, O, Kawazome, H, Kobuchi, T, Kostrioukov, A, Kubo, S, Kumazawa, R, Masuzaki, S, Minami, T, Miyazawa, J, Morita, S, Murakami, S, Muto, S, Mutoh, T, Nakamura, Y, Nakanishi, H, Narushima, Y, Nishimura, K, Noda, N, Notake, T, Nozato, H, Ohdachi, S, Oka, Y, Osakabe, M, Ozaki, T, Peterson, BJ, Sagara, A, Saida, T, Saito, K, Sakakibara, S, Sakamoto, R, Sasao, M, Sato, K, Sato, M, Seki, T, Shoji, M, Takeuchi, N, Toi, K, Torii, Y, Tsumori, K, Watari, T, Xu, Y, Yamada, H, Yamada, I, Yamamoto, S, Yamamoto, T, Yoshimura, Y, Ohtake, I, Ohkubo, K, Mito, T, Satow, T, Uda, T, Yamazaki, K, Matsuoka, K, Motojima, O & Fujiwara, M 2004, 'Radial electric field and transport near the rational surface and the magnetic island in LHD', Nuclear Fusion, vol. 44, no. 2, pp. 290-295. https://doi.org/10.1088/0029-5515/44/2/010
Ida, K. ; Shigeru, Inagaki ; Tamura, N. ; Morisaki, T. ; Ohyabu., N. ; Khlopenkov, K. ; Sudo, S. ; Watanabe, K. ; Yokoyama, M. ; Shimozuma, T. ; Takeiri, Y. ; Itoh, K. ; Yoshinuma, M. ; Liang, Y. ; Narihara, K. ; Tanaka, K. ; Nagayama, Y. ; Tokuzawa, T. ; Kawahata, K. ; Suzuki, H. ; Komori, A. ; Akiyama, T. ; Ashikawa, N. ; Emoto, M. ; Funaba, H. ; Goncharov, P. ; Goto, M. ; Idei, Hiroshi ; Ikeda, K. ; Isobe, M. ; Kaneko, O. ; Kawazome, H. ; Kobuchi, T. ; Kostrioukov, A. ; Kubo, S. ; Kumazawa, R. ; Masuzaki, S. ; Minami, T. ; Miyazawa, J. ; Morita, S. ; Murakami, S. ; Muto, S. ; Mutoh, T. ; Nakamura, Y. ; Nakanishi, H. ; Narushima, Y. ; Nishimura, K. ; Noda, N. ; Notake, T. ; Nozato, H. ; Ohdachi, S. ; Oka, Y. ; Osakabe, M. ; Ozaki, T. ; Peterson, B. J. ; Sagara, A. ; Saida, T. ; Saito, K. ; Sakakibara, S. ; Sakamoto, R. ; Sasao, M. ; Sato, K. ; Sato, M. ; Seki, T. ; Shoji, M. ; Takeuchi, N. ; Toi, K. ; Torii, Y. ; Tsumori, K. ; Watari, T. ; Xu, Y. ; Yamada, H. ; Yamada, I. ; Yamamoto, S. ; Yamamoto, T. ; Yoshimura, Y. ; Ohtake, I. ; Ohkubo, K. ; Mito, T. ; Satow, T. ; Uda, T. ; Yamazaki, K. ; Matsuoka, K. ; Motojima, O. ; Fujiwara, M. / Radial electric field and transport near the rational surface and the magnetic island in LHD. In: Nuclear Fusion. 2004 ; Vol. 44, No. 2. pp. 290-295.
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abstract = "The structure of the radial electric field and heat transport at the magnetic island in the large helical device (LHD) are investigated by measuring the radial profile of the poloidal flow with charge exchange spectroscopy and measuring the time evolution of the electron temperature with ECE. A vortex-like plasma flow along the magnetic flux surface inside the magnetic island is observed when the n/m = 1/1 external perturbation field becomes large enough to increase the magnetic island width above a critical range (15-20{\%} of minor radius) in LHD. This convective poloidal flow results in a non-flat space potential inside the magnetic island. The sign of the curvature of the space potential (∂2Φ/∂r2, where Φ is the space potential) depends on the radial electric field at the boundary of the magnetic island. The heat transport inside the magnetic island is studied with a cold pulse propagation technique. The experimental results show the existence of radial electric field shear at the boundary of the magnetic island and a reduction in heat transport at the boundary and inside the magnetic island.",
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T1 - Radial electric field and transport near the rational surface and the magnetic island in LHD

AU - Ida, K.

AU - Shigeru, Inagaki

AU - Tamura, N.

AU - Morisaki, T.

AU - Ohyabu., N.

AU - Khlopenkov, K.

AU - Sudo, S.

AU - Watanabe, K.

AU - Yokoyama, M.

AU - Shimozuma, T.

AU - Takeiri, Y.

AU - Itoh, K.

AU - Yoshinuma, M.

AU - Liang, Y.

AU - Narihara, K.

AU - Tanaka, K.

AU - Nagayama, Y.

AU - Tokuzawa, T.

AU - Kawahata, K.

AU - Suzuki, H.

AU - Komori, A.

AU - Akiyama, T.

AU - Ashikawa, N.

AU - Emoto, M.

AU - Funaba, H.

AU - Goncharov, P.

AU - Goto, M.

AU - Idei, Hiroshi

AU - Ikeda, K.

AU - Isobe, M.

AU - Kaneko, O.

AU - Kawazome, H.

AU - Kobuchi, T.

AU - Kostrioukov, A.

AU - Kubo, S.

AU - Kumazawa, R.

AU - Masuzaki, S.

AU - Minami, T.

AU - Miyazawa, J.

AU - Morita, S.

AU - Murakami, S.

AU - Muto, S.

AU - Mutoh, T.

AU - Nakamura, Y.

AU - Nakanishi, H.

AU - Narushima, Y.

AU - Nishimura, K.

AU - Noda, N.

AU - Notake, T.

AU - Nozato, H.

AU - Ohdachi, S.

AU - Oka, Y.

AU - Osakabe, M.

AU - Ozaki, T.

AU - Peterson, B. J.

AU - Sagara, A.

AU - Saida, T.

AU - Saito, K.

AU - Sakakibara, S.

AU - Sakamoto, R.

AU - Sasao, M.

AU - Sato, K.

AU - Sato, M.

AU - Seki, T.

AU - Shoji, M.

AU - Takeuchi, N.

AU - Toi, K.

AU - Torii, Y.

AU - Tsumori, K.

AU - Watari, T.

AU - Xu, Y.

AU - Yamada, H.

AU - Yamada, I.

AU - Yamamoto, S.

AU - Yamamoto, T.

AU - Yoshimura, Y.

AU - Ohtake, I.

AU - Ohkubo, K.

AU - Mito, T.

AU - Satow, T.

AU - Uda, T.

AU - Yamazaki, K.

AU - Matsuoka, K.

AU - Motojima, O.

AU - Fujiwara, M.

PY - 2004/2/1

Y1 - 2004/2/1

N2 - The structure of the radial electric field and heat transport at the magnetic island in the large helical device (LHD) are investigated by measuring the radial profile of the poloidal flow with charge exchange spectroscopy and measuring the time evolution of the electron temperature with ECE. A vortex-like plasma flow along the magnetic flux surface inside the magnetic island is observed when the n/m = 1/1 external perturbation field becomes large enough to increase the magnetic island width above a critical range (15-20% of minor radius) in LHD. This convective poloidal flow results in a non-flat space potential inside the magnetic island. The sign of the curvature of the space potential (∂2Φ/∂r2, where Φ is the space potential) depends on the radial electric field at the boundary of the magnetic island. The heat transport inside the magnetic island is studied with a cold pulse propagation technique. The experimental results show the existence of radial electric field shear at the boundary of the magnetic island and a reduction in heat transport at the boundary and inside the magnetic island.

AB - The structure of the radial electric field and heat transport at the magnetic island in the large helical device (LHD) are investigated by measuring the radial profile of the poloidal flow with charge exchange spectroscopy and measuring the time evolution of the electron temperature with ECE. A vortex-like plasma flow along the magnetic flux surface inside the magnetic island is observed when the n/m = 1/1 external perturbation field becomes large enough to increase the magnetic island width above a critical range (15-20% of minor radius) in LHD. This convective poloidal flow results in a non-flat space potential inside the magnetic island. The sign of the curvature of the space potential (∂2Φ/∂r2, where Φ is the space potential) depends on the radial electric field at the boundary of the magnetic island. The heat transport inside the magnetic island is studied with a cold pulse propagation technique. The experimental results show the existence of radial electric field shear at the boundary of the magnetic island and a reduction in heat transport at the boundary and inside the magnetic island.

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