Integrated discharge scenario for high-temperature helical plasma in LHD

K. Nagaoka; H. Takahashi; S. Murakami; H. Nakano; Y. Takeiri; H. Tsuchiya; M. Osakabe; K. Ida; M. Yokoyama; M. Yoshinuma; S. Morita; M. Goto; T. Oishi; N. Pablant; K. Fujii; K. Tanaka; N. Tamura; Y. Nakamura; X. Du; T. Ido; A. Shimizu; S. Kubo; H. Igami; R. Seki; C. Suzuki; Y. Suzuki; K. Tsumori; K. Ikeda; M. Kisaki; Y. Yoshimura; T. Shimozuma; T. Seki; K. Saito; H. Kasahara; S. Kamio; T. Mutoh; O. Kaneko; H. Yamada; A. Komori

doi:10.1088/0029-5515/55/11/113020

Integrated discharge scenario for high-temperature helical plasma in LHD

K. Nagaoka, H. Takahashi, S. Murakami, H. Nakano, Y. Takeiri, H. Tsuchiya, M. Osakabe, K. Ida, M. Yokoyama, M. Yoshinuma, S. Morita, M. Goto, T. Oishi, N. Pablant, K. Fujii, K. Tanaka, N. Tamura, Y. Nakamura, X. Du, T. IdoA. Shimizu, S. Kubo, H. Igami, R. Seki, C. Suzuki, Y. Suzuki, K. Tsumori, K. Ikeda, M. Kisaki, Y. Yoshimura, T. Shimozuma, T. Seki, K. Saito, H. Kasahara, S. Kamio, T. Mutoh, O. Kaneko, H. Yamada, A. Komori

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

36 Scopus citations

Abstract

The discharge scenario of high temperature plasma with a helical configuration has significantly progressed. The increase of central ion temperature due to the reduction of wall recycling was clearly observed. The peaking of the ion heating profile and the reduction of charge exchange loss of energetic ions play an important role for further improvement of ion heat transport in the ion internal transport barrier (ITB) core. The ion ITB and electron ITB have been successfully integrated due to the superposition of centrally focused electron cyclotron heating to the ion ITB plasma, and the high temperature regime of the ion temperature comparable to the electron temperature (T_i ∼ T_e) has been significantly extended. The width of the ion ITB formed with electron ITB is wider than the width of electron ITB. The positive radial electric field was observed in the integrated ITB plasma by a heavy ion beam probe, while the negative radial electric field was observed in ion ITB plasmas. The ion temperature gradient decreases with the increase of the temperature ratio (T_e /T_i).

Original language	English
Article number	113020
Journal	Nuclear Fusion
Volume	55
Issue number	11
DOIs	https://doi.org/10.1088/0029-5515/55/11/113020
State	Published - Sep 28 2015
Externally published	Yes

Keywords

ITB
discharge scenario
helical plasma
impurity hole
radial electric field

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

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10.1088/0029-5515/55/11/113020

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Nagaoka, K., Takahashi, H., Murakami, S., Nakano, H., Takeiri, Y., Tsuchiya, H., Osakabe, M., Ida, K., Yokoyama, M., Yoshinuma, M., Morita, S., Goto, M., Oishi, T., Pablant, N., Fujii, K., Tanaka, K., Tamura, N., Nakamura, Y., Du, X., ... Komori, A. (2015). Integrated discharge scenario for high-temperature helical plasma in LHD. Nuclear Fusion, 55(11), Article 113020. https://doi.org/10.1088/0029-5515/55/11/113020

@article{b475fe25220f47b8a1f613b638c348d3,

title = "Integrated discharge scenario for high-temperature helical plasma in LHD",

abstract = "The discharge scenario of high temperature plasma with a helical configuration has significantly progressed. The increase of central ion temperature due to the reduction of wall recycling was clearly observed. The peaking of the ion heating profile and the reduction of charge exchange loss of energetic ions play an important role for further improvement of ion heat transport in the ion internal transport barrier (ITB) core. The ion ITB and electron ITB have been successfully integrated due to the superposition of centrally focused electron cyclotron heating to the ion ITB plasma, and the high temperature regime of the ion temperature comparable to the electron temperature (Ti ∼ Te) has been significantly extended. The width of the ion ITB formed with electron ITB is wider than the width of electron ITB. The positive radial electric field was observed in the integrated ITB plasma by a heavy ion beam probe, while the negative radial electric field was observed in ion ITB plasmas. The ion temperature gradient decreases with the increase of the temperature ratio (Te /Ti).",

keywords = "ITB, discharge scenario, helical plasma, impurity hole, radial electric field",

author = "K. Nagaoka and H. Takahashi and S. Murakami and H. Nakano and Y. Takeiri and H. Tsuchiya and M. Osakabe and K. Ida and M. Yokoyama and M. Yoshinuma and S. Morita and M. Goto and T. Oishi and N. Pablant and K. Fujii and K. Tanaka and N. Tamura and Y. Nakamura and X. Du and T. Ido and A. Shimizu and S. Kubo and H. Igami and R. Seki and C. Suzuki and Y. Suzuki and K. Tsumori and K. Ikeda and M. Kisaki and Y. Yoshimura and T. Shimozuma and T. Seki and K. Saito and H. Kasahara and S. Kamio and T. Mutoh and O. Kaneko and H. Yamada and A. Komori",

note = "Publisher Copyright: {\"i}¿½ 2015 IAEA, Vienna.",

year = "2015",

month = sep,

day = "28",

doi = "10.1088/0029-5515/55/11/113020",

language = "English",

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journal = "Nuclear Fusion",

issn = "0029-5515",

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Nagaoka, K, Takahashi, H, Murakami, S, Nakano, H, Takeiri, Y, Tsuchiya, H, Osakabe, M, Ida, K, Yokoyama, M, Yoshinuma, M, Morita, S, Goto, M, Oishi, T, Pablant, N, Fujii, K, Tanaka, K, Tamura, N, Nakamura, Y, Du, X, Ido, T, Shimizu, A, Kubo, S, Igami, H, Seki, R, Suzuki, C, Suzuki, Y, Tsumori, K, Ikeda, K, Kisaki, M, Yoshimura, Y, Shimozuma, T, Seki, T, Saito, K, Kasahara, H, Kamio, S, Mutoh, T, Kaneko, O, Yamada, H & Komori, A 2015, 'Integrated discharge scenario for high-temperature helical plasma in LHD', Nuclear Fusion, vol. 55, no. 11, 113020. https://doi.org/10.1088/0029-5515/55/11/113020

TY - JOUR

T1 - Integrated discharge scenario for high-temperature helical plasma in LHD

AU - Nagaoka, K.

AU - Takahashi, H.

AU - Murakami, S.

AU - Nakano, H.

AU - Takeiri, Y.

AU - Tsuchiya, H.

AU - Osakabe, M.

AU - Ida, K.

AU - Yokoyama, M.

AU - Yoshinuma, M.

AU - Morita, S.

AU - Goto, M.

AU - Oishi, T.

AU - Pablant, N.

AU - Fujii, K.

AU - Tanaka, K.

AU - Tamura, N.

AU - Nakamura, Y.

AU - Du, X.

AU - Ido, T.

AU - Shimizu, A.

AU - Kubo, S.

AU - Igami, H.

AU - Seki, R.

AU - Suzuki, C.

AU - Suzuki, Y.

AU - Tsumori, K.

AU - Ikeda, K.

AU - Kisaki, M.

AU - Yoshimura, Y.

AU - Shimozuma, T.

AU - Seki, T.

AU - Saito, K.

AU - Kasahara, H.

AU - Kamio, S.

AU - Mutoh, T.

AU - Kaneko, O.

AU - Yamada, H.

AU - Komori, A.

PY - 2015/9/28

Y1 - 2015/9/28

N2 - The discharge scenario of high temperature plasma with a helical configuration has significantly progressed. The increase of central ion temperature due to the reduction of wall recycling was clearly observed. The peaking of the ion heating profile and the reduction of charge exchange loss of energetic ions play an important role for further improvement of ion heat transport in the ion internal transport barrier (ITB) core. The ion ITB and electron ITB have been successfully integrated due to the superposition of centrally focused electron cyclotron heating to the ion ITB plasma, and the high temperature regime of the ion temperature comparable to the electron temperature (Ti ∼ Te) has been significantly extended. The width of the ion ITB formed with electron ITB is wider than the width of electron ITB. The positive radial electric field was observed in the integrated ITB plasma by a heavy ion beam probe, while the negative radial electric field was observed in ion ITB plasmas. The ion temperature gradient decreases with the increase of the temperature ratio (Te /Ti).

AB - The discharge scenario of high temperature plasma with a helical configuration has significantly progressed. The increase of central ion temperature due to the reduction of wall recycling was clearly observed. The peaking of the ion heating profile and the reduction of charge exchange loss of energetic ions play an important role for further improvement of ion heat transport in the ion internal transport barrier (ITB) core. The ion ITB and electron ITB have been successfully integrated due to the superposition of centrally focused electron cyclotron heating to the ion ITB plasma, and the high temperature regime of the ion temperature comparable to the electron temperature (Ti ∼ Te) has been significantly extended. The width of the ion ITB formed with electron ITB is wider than the width of electron ITB. The positive radial electric field was observed in the integrated ITB plasma by a heavy ion beam probe, while the negative radial electric field was observed in ion ITB plasmas. The ion temperature gradient decreases with the increase of the temperature ratio (Te /Ti).

KW - ITB

KW - discharge scenario

KW - helical plasma

KW - impurity hole

KW - radial electric field

UR - http://www.scopus.com/inward/record.url?scp=84946018269&partnerID=8YFLogxK

U2 - 10.1088/0029-5515/55/11/113020

DO - 10.1088/0029-5515/55/11/113020

M3 - Article

AN - SCOPUS:84946018269

SN - 0029-5515

VL - 55

JO - Nuclear Fusion

JF - Nuclear Fusion

IS - 11

M1 - 113020

ER -

Integrated discharge scenario for high-temperature helical plasma in LHD

Abstract

Keywords

UN SDGs

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