Flow damping due to stochastization of the magnetic field

K. Ida; M. Yoshinuma; H. Tsuchiya; T. Kobayashi; C. Suzuki; M. Yokoyama; A. Shimizu; K. Nagaoka; S. Inagaki; K. Itoh; T. Akiyama; M. Emoto; T. Evans; A. Dinklage; X. Du; K. Fujii; M. Goto; T. Goto; M. Hasuo; C. Hidalgo; K. Ichiguchi; A. Ishizawa; M. Jakubowski; K. Kamiya; H. Kasahara; G. Kawamura; D. Kato; M. Kobayashi; S. Morita; K. Mukai; I. Murakami; S. Murakami; Y. Narushima; M. Nunami; S. Ohdach; N. Ohno; M. Osakabe; N. Pablant; S. Sakakibara; T. Seki; T. Shimozuma; M. Shoji; S. Sudo; K. Tanaka; T. Tokuzawa; Y. Todo; H. Wang; H. Yamada; Y. Takeiri; T. Mutoh; S. Imagawa; T. Mito; Y. Nagayama; K. Y. Watanabe; N. Ashikawa; H. Chikaraishi; A. Ejiri; M. Furukawa; T. Fujita; S. Hamaguchi; H. Igami; M. Isobe; S. Masuzaki; T. Morisaki; G. Motojima; K. Nagasaki; H. Nakano; Y. Oya; Y. Suzuki; R. Sakamoto; M. Sakamoto; A. Sanpei; H. Takahashi; M. Tokitani; Y. Ueda; Y. Yoshimura; S. Yamamoto; K. Nishimura; H. Sugama; T. Yamamoto; H. Idei; A. Isayama; S. Kitajima; S. Masamune; K. Shinohara; P. S. Bawankar; E. Bernard; M. Von Berkel; H. Funaba; X. L. Huang; T. Ii; T. Ido; K. Ikeda; S. Kamio; R. Kumazawa; C. Moon; S. Muto; J. Miyazawa; T. Ming; Y. Nakamura; S. Nishimura; K. Ogawa; T. Ozaki; T. Oishi; M. Ohno; S. Pandya; R. Seki; R. Sano; K. Saito; H. Sakaue; Y. Takemura; K. Tsumori; N. Tamura; H. Tanaka; K. Toi; B. Wieland; I. Yamada; R. Yasuhara; H. Zhang; O. Kaneko; A. Komori

doi:10.1038/ncomms6816

Flow damping due to stochastization of the magnetic field

K. Ida, M. Yoshinuma, H. Tsuchiya, T. Kobayashi, C. Suzuki, M. Yokoyama, A. Shimizu, K. Nagaoka, S. Inagaki, K. Itoh, T. Akiyama, M. Emoto, T. Evans, A. Dinklage, X. Du, K. Fujii, M. Goto, T. Goto, M. Hasuo, C. HidalgoK. Ichiguchi, A. Ishizawa, M. Jakubowski, K. Kamiya, H. Kasahara, G. Kawamura, D. Kato, M. Kobayashi, S. Morita, K. Mukai, I. Murakami, S. Murakami, Y. Narushima, M. Nunami, S. Ohdach, N. Ohno, M. Osakabe, N. Pablant, S. Sakakibara, T. Seki, T. Shimozuma, M. Shoji, S. Sudo, K. Tanaka, T. Tokuzawa, Y. Todo, H. Wang, H. Yamada, Y. Takeiri, T. Mutoh, S. Imagawa, T. Mito, Y. Nagayama, K. Y. Watanabe, N. Ashikawa, H. Chikaraishi, A. Ejiri, M. Furukawa, T. Fujita, S. Hamaguchi, H. Igami, M. Isobe, S. Masuzaki, T. Morisaki, G. Motojima, K. Nagasaki, H. Nakano, Y. Oya, Y. Suzuki, R. Sakamoto, M. Sakamoto, A. Sanpei, H. Takahashi, M. Tokitani, Y. Ueda, Y. Yoshimura, S. Yamamoto, K. Nishimura, H. Sugama, T. Yamamoto, H. Idei, A. Isayama, S. Kitajima, S. Masamune, K. Shinohara, P. S. Bawankar, E. Bernard, M. Von Berkel, H. Funaba, X. L. Huang, T. Ii, T. Ido, K. Ikeda, S. Kamio, R. Kumazawa, C. Moon, S. Muto, J. Miyazawa, T. Ming, Y. Nakamura, S. Nishimura, K. Ogawa, T. Ozaki, T. Oishi, M. Ohno, S. Pandya, R. Seki, R. Sano, K. Saito, H. Sakaue, Y. Takemura, K. Tsumori, N. Tamura, H. Tanaka, K. Toi, B. Wieland, I. Yamada, R. Yasuhara, H. Zhang, O. Kaneko, A. Komori

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Abstract

The driving and damping mechanism of plasma flow is an important issue because flow shear has a significant impact on turbulence in a plasma, which determines the transport in the magnetized plasma. Here we report clear evidence of the flow damping due to stochastization of the magnetic field. Abrupt damping of the toroidal flow associated with a transition from a nested magnetic flux surface to a stochastic magnetic field is observed when the magnetic shear at the rational surface decreases to 0.5 in the large helical device. This flow damping and resulting profile flattening are much stronger than expected from the Rechester-Rosenbluth model. The toroidal flow shear shows a linear decay, while the ion temperature gradient shows an exponential decay. This observation suggests that the flow damping is due to the change in the non-diffusive term of momentum transport.

Original language	English
Article number	5816
Journal	Nature Communications
Volume	6
DOIs	https://doi.org/10.1038/ncomms6816
State	Published - Jan 8 2015
Externally published	Yes

Funding

This work is partly supported by the Grant-in-Aid for Scientific Research (No. 21224014 and 23246164) of JSPS Japan; by NIFS10ULHH021; and by the collaboration program of NIFS and RIAM Kyushu University (NIFS13KOCT001).

Funders	Funder number
NIFS10ULHH021
RIAM Kyushu University	NIFS13KOCT001
Japan Society for the Promotion of Science	23246164

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10.1038/ncomms6816

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Ida, K., Yoshinuma, M., Tsuchiya, H., Kobayashi, T., Suzuki, C., Yokoyama, M., Shimizu, A., Nagaoka, K., Inagaki, S., Itoh, K., Akiyama, T., Emoto, M., Evans, T., Dinklage, A., Du, X., Fujii, K., Goto, M., Goto, T., Hasuo, M., ... Komori, A. (2015). Flow damping due to stochastization of the magnetic field. Nature Communications, 6, Article 5816. https://doi.org/10.1038/ncomms6816

@article{c7d094c160ce4a7c8a5faa4200c60238,

title = "Flow damping due to stochastization of the magnetic field",

abstract = "The driving and damping mechanism of plasma flow is an important issue because flow shear has a significant impact on turbulence in a plasma, which determines the transport in the magnetized plasma. Here we report clear evidence of the flow damping due to stochastization of the magnetic field. Abrupt damping of the toroidal flow associated with a transition from a nested magnetic flux surface to a stochastic magnetic field is observed when the magnetic shear at the rational surface decreases to 0.5 in the large helical device. This flow damping and resulting profile flattening are much stronger than expected from the Rechester-Rosenbluth model. The toroidal flow shear shows a linear decay, while the ion temperature gradient shows an exponential decay. This observation suggests that the flow damping is due to the change in the non-diffusive term of momentum transport.",

author = "K. Ida and M. Yoshinuma and H. Tsuchiya and T. Kobayashi and C. Suzuki and M. Yokoyama and A. Shimizu and K. Nagaoka and S. Inagaki and K. Itoh and T. Akiyama and M. Emoto and T. Evans and A. Dinklage and X. Du and K. Fujii and M. Goto and T. Goto and M. Hasuo and C. Hidalgo and K. Ichiguchi and A. Ishizawa and M. Jakubowski and K. Kamiya and H. Kasahara and G. Kawamura and D. Kato and M. Kobayashi and S. Morita and K. Mukai and I. Murakami and S. Murakami and Y. Narushima and M. Nunami and S. Ohdach and N. Ohno and M. Osakabe and N. Pablant and S. Sakakibara and T. Seki and T. Shimozuma and M. Shoji and S. Sudo and K. Tanaka and T. Tokuzawa and Y. Todo and H. Wang and H. Yamada and Y. Takeiri and T. Mutoh and S. Imagawa and T. Mito and Y. Nagayama and Watanabe, {K. Y.} and N. Ashikawa and H. Chikaraishi and A. Ejiri and M. Furukawa and T. Fujita and S. Hamaguchi and H. Igami and M. Isobe and S. Masuzaki and T. Morisaki and G. Motojima and K. Nagasaki and H. Nakano and Y. Oya and Y. Suzuki and R. Sakamoto and M. Sakamoto and A. Sanpei and H. Takahashi and M. Tokitani and Y. Ueda and Y. Yoshimura and S. Yamamoto and K. Nishimura and H. Sugama and T. Yamamoto and H. Idei and A. Isayama and S. Kitajima and S. Masamune and K. Shinohara and Bawankar, {P. S.} and E. Bernard and {Von Berkel}, M. and H. Funaba and Huang, {X. L.} and T. Ii and T. Ido and K. Ikeda and S. Kamio and R. Kumazawa and C. Moon and S. Muto and J. Miyazawa and T. Ming and Y. Nakamura and S. Nishimura and K. Ogawa and T. Ozaki and T. Oishi and M. Ohno and S. Pandya and R. Seki and R. Sano and K. Saito and H. Sakaue and Y. Takemura and K. Tsumori and N. Tamura and H. Tanaka and K. Toi and B. Wieland and I. Yamada and R. Yasuhara and H. Zhang and O. Kaneko and A. Komori",

year = "2015",

month = jan,

day = "8",

doi = "10.1038/ncomms6816",

language = "English",

volume = "6",

journal = "Nature Communications",

issn = "2041-1723",

publisher = "Nature Research",

}

Ida, K, Yoshinuma, M, Tsuchiya, H, Kobayashi, T, Suzuki, C, Yokoyama, M, Shimizu, A, Nagaoka, K, Inagaki, S, Itoh, K, Akiyama, T, Emoto, M, Evans, T, Dinklage, A, Du, X, Fujii, K, Goto, M, Goto, T, Hasuo, M, Hidalgo, C, Ichiguchi, K, Ishizawa, A, Jakubowski, M, Kamiya, K, Kasahara, H, Kawamura, G, Kato, D, Kobayashi, M, Morita, S, Mukai, K, Murakami, I, Murakami, S, Narushima, Y, Nunami, M, Ohdach, S, Ohno, N, Osakabe, M, Pablant, N, Sakakibara, S, Seki, T, Shimozuma, T, Shoji, M, Sudo, S, Tanaka, K, Tokuzawa, T, Todo, Y, Wang, H, Yamada, H, Takeiri, Y, Mutoh, T, Imagawa, S, Mito, T, Nagayama, Y, Watanabe, KY, Ashikawa, N, Chikaraishi, H, Ejiri, A, Furukawa, M, Fujita, T, Hamaguchi, S, Igami, H, Isobe, M, Masuzaki, S, Morisaki, T, Motojima, G, Nagasaki, K, Nakano, H, Oya, Y, Suzuki, Y, Sakamoto, R, Sakamoto, M, Sanpei, A, Takahashi, H, Tokitani, M, Ueda, Y, Yoshimura, Y, Yamamoto, S, Nishimura, K, Sugama, H, Yamamoto, T, Idei, H, Isayama, A, Kitajima, S, Masamune, S, Shinohara, K, Bawankar, PS, Bernard, E, Von Berkel, M, Funaba, H, Huang, XL, Ii, T, Ido, T, Ikeda, K, Kamio, S, Kumazawa, R, Moon, C, Muto, S, Miyazawa, J, Ming, T, Nakamura, Y, Nishimura, S, Ogawa, K, Ozaki, T, Oishi, T, Ohno, M, Pandya, S, Seki, R, Sano, R, Saito, K, Sakaue, H, Takemura, Y, Tsumori, K, Tamura, N, Tanaka, H, Toi, K, Wieland, B, Yamada, I, Yasuhara, R, Zhang, H, Kaneko, O & Komori, A 2015, 'Flow damping due to stochastization of the magnetic field', Nature Communications, vol. 6, 5816. https://doi.org/10.1038/ncomms6816

TY - JOUR

T1 - Flow damping due to stochastization of the magnetic field

AU - Ida, K.

AU - Yoshinuma, M.

AU - Tsuchiya, H.

AU - Kobayashi, T.

AU - Suzuki, C.

AU - Yokoyama, M.

AU - Shimizu, A.

AU - Nagaoka, K.

AU - Inagaki, S.

AU - Itoh, K.

AU - Akiyama, T.

AU - Emoto, M.

AU - Evans, T.

AU - Dinklage, A.

AU - Du, X.

AU - Fujii, K.

AU - Goto, M.

AU - Goto, T.

AU - Hasuo, M.

AU - Hidalgo, C.

AU - Ichiguchi, K.

AU - Ishizawa, A.

AU - Jakubowski, M.

AU - Kamiya, K.

AU - Kasahara, H.

AU - Kawamura, G.

AU - Kato, D.

AU - Kobayashi, M.

AU - Morita, S.

AU - Mukai, K.

AU - Murakami, I.

AU - Murakami, S.

AU - Narushima, Y.

AU - Nunami, M.

AU - Ohdach, S.

AU - Ohno, N.

AU - Osakabe, M.

AU - Pablant, N.

AU - Sakakibara, S.

AU - Seki, T.

AU - Shimozuma, T.

AU - Shoji, M.

AU - Sudo, S.

AU - Tanaka, K.

AU - Tokuzawa, T.

AU - Todo, Y.

AU - Wang, H.

AU - Yamada, H.

AU - Takeiri, Y.

AU - Mutoh, T.

AU - Imagawa, S.

AU - Mito, T.

AU - Nagayama, Y.

AU - Watanabe, K. Y.

AU - Ashikawa, N.

AU - Chikaraishi, H.

AU - Ejiri, A.

AU - Furukawa, M.

AU - Fujita, T.

AU - Hamaguchi, S.

AU - Igami, H.

AU - Isobe, M.

AU - Masuzaki, S.

AU - Morisaki, T.

AU - Motojima, G.

AU - Nagasaki, K.

AU - Nakano, H.

AU - Oya, Y.

AU - Suzuki, Y.

AU - Sakamoto, R.

AU - Sakamoto, M.

AU - Sanpei, A.

AU - Takahashi, H.

AU - Tokitani, M.

AU - Ueda, Y.

AU - Yoshimura, Y.

AU - Yamamoto, S.

AU - Nishimura, K.

AU - Sugama, H.

AU - Yamamoto, T.

AU - Idei, H.

AU - Isayama, A.

AU - Kitajima, S.

AU - Masamune, S.

AU - Shinohara, K.

AU - Bawankar, P. S.

AU - Bernard, E.

AU - Von Berkel, M.

AU - Funaba, H.

AU - Huang, X. L.

AU - Ii, T.

AU - Ido, T.

AU - Ikeda, K.

AU - Kamio, S.

AU - Kumazawa, R.

AU - Moon, C.

AU - Muto, S.

AU - Miyazawa, J.

AU - Ming, T.

AU - Nakamura, Y.

AU - Nishimura, S.

AU - Ogawa, K.

AU - Ozaki, T.

AU - Oishi, T.

AU - Ohno, M.

AU - Pandya, S.

AU - Seki, R.

AU - Sano, R.

AU - Saito, K.

AU - Sakaue, H.

AU - Takemura, Y.

AU - Tsumori, K.

AU - Tamura, N.

AU - Tanaka, H.

AU - Toi, K.

AU - Wieland, B.

AU - Yamada, I.

AU - Yasuhara, R.

AU - Zhang, H.

AU - Kaneko, O.

AU - Komori, A.

PY - 2015/1/8

Y1 - 2015/1/8

N2 - The driving and damping mechanism of plasma flow is an important issue because flow shear has a significant impact on turbulence in a plasma, which determines the transport in the magnetized plasma. Here we report clear evidence of the flow damping due to stochastization of the magnetic field. Abrupt damping of the toroidal flow associated with a transition from a nested magnetic flux surface to a stochastic magnetic field is observed when the magnetic shear at the rational surface decreases to 0.5 in the large helical device. This flow damping and resulting profile flattening are much stronger than expected from the Rechester-Rosenbluth model. The toroidal flow shear shows a linear decay, while the ion temperature gradient shows an exponential decay. This observation suggests that the flow damping is due to the change in the non-diffusive term of momentum transport.

AB - The driving and damping mechanism of plasma flow is an important issue because flow shear has a significant impact on turbulence in a plasma, which determines the transport in the magnetized plasma. Here we report clear evidence of the flow damping due to stochastization of the magnetic field. Abrupt damping of the toroidal flow associated with a transition from a nested magnetic flux surface to a stochastic magnetic field is observed when the magnetic shear at the rational surface decreases to 0.5 in the large helical device. This flow damping and resulting profile flattening are much stronger than expected from the Rechester-Rosenbluth model. The toroidal flow shear shows a linear decay, while the ion temperature gradient shows an exponential decay. This observation suggests that the flow damping is due to the change in the non-diffusive term of momentum transport.

UR - http://www.scopus.com/inward/record.url?scp=84948002988&partnerID=8YFLogxK

U2 - 10.1038/ncomms6816

DO - 10.1038/ncomms6816

M3 - Article

AN - SCOPUS:84948002988

SN - 2041-1723

VL - 6

JO - Nature Communications

JF - Nature Communications

M1 - 5816

ER -

Flow damping due to stochastization of the magnetic field

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