Impact of heat deposition profile on global confinement of NBI heated plasmas in the LHD

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

Research output: Contribution to journalArticle

33 Citations (Scopus)

Abstract

Energy confinement and heat transport of net-current-free NBI heated plasmas in the large helical device (LHD) are discussed with emphasis on density and power deposition profile dependences. Although the apparent density dependence of the energy confinement time has been demonstrated in a wide parameter range in LHD, the loss of this dependence has been observed in the high density regime under specific conditions. Broad heat deposition due to off-axis alignment and shallow penetration of neutral beams degrades the global energy confinement while the local heat transport maintains a clear temperature dependence, lying between Bohm and gyro-Bohm characteristics. The central heat deposition tends towards an intrinsic density dependence like τE ∝ (n̄e/P)0.6 from the state where density dependence is lost. The broadening of the temperature profile due to the broad heat deposition profile contrasts with the invariant property that has been observed widely as profile resilience or stiffness in tokamak experiments. The confinement improvement as a result of the inward shift of the magnetic axis is obvious in the core region, which emphasizes the improvement of transport because of the geometry being unfavourable for the central heating of NBI in this configuration. The edge pressure, clearly, does not depend on the magnetic axis position. Unlike a tokamak H-mode, the edge pressure is determined by transport and can be increased by increasing the heating power.

Original languageEnglish
Pages (from-to)749-755
Number of pages7
JournalNuclear Fusion
Volume43
Issue number8
DOIs
Publication statusPublished - Aug 1 2003

Fingerprint

heat
profiles
resilience
heating
neutral beams
temperature profiles
energy
stiffness
penetration
alignment
temperature dependence
shift
geometry
configurations

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics
  • Condensed Matter Physics

Cite this

Yamada, H., Murakami, S., Yamazaki, K., Kaneko, O., Miyazawa, J., Sakamoto, R., ... Motojima, O. (2003). Impact of heat deposition profile on global confinement of NBI heated plasmas in the LHD. Nuclear Fusion, 43(8), 749-755. https://doi.org/10.1088/0029-5515/43/8/317

Impact of heat deposition profile on global confinement of NBI heated plasmas in the LHD. / Yamada, H.; Murakami, S.; Yamazaki, K.; Kaneko, O.; Miyazawa, J.; Sakamoto, R.; Watanabe, K. Y.; Narihara, K.; Tanaka, K.; Sakakibara, S.; Osakabe, M.; Peterson, B. J.; Morita, S.; Ida, K.; Inagaki, S.; Masuzaki, S.; Morisaki, T.; Rewoldt, G.; Sugama, H.; Nakajima, N.; Cooper, W. A.; Akiyama, T.; Ashikawa, N.; Emoto, M.; Funaba, H.; Goncharov, P.; Goto, M.; Idei, H.; Ikeda, K.; Isobe, M.; Kawahata, K.; Kawazome, H.; Khlopenkov, K.; Kobuchi, T.; Komori, A.; Kostrioukov, A.; Kubo, S.; Kumazawa, R.; Liang, Y.; Minami, T.; Muto, S.; Mutoh, T.; Nagayama, Y.; Nakamura, Y.; Nakanishi, H.; Narushima, Y.; Nishimura, K.; Noda, N.; Notake, T.; Nozato, H.; Ohdachi, S.; Ohyabu, N.; Oka, Y.; Ozaki, T.; Sagara, A.; Saida, T.; Saito, K.; Sasao, M.; Sato, K.; Sato, M.; Seki, T.; Shimozuma, T.; Shoji, M.; Suzuki, H.; Takeiri, Y.; Takeuchi, N.; Tamura, N.; Toi, K.; Tokuzawa, T.; Torii, Y.; Tsumori, K.; Watanabe, T.; Watari, T.; Xu, Y.; Yamada, I.; Yamamoto, S.; Yamamoto, T.; Yokoyama, M.; Yoshimura, Y.; Yoshinuma, M.; Mito, T.; Itoh, K.; Ohkubo, K.; Ohtake, I.; Satow, T.; Sudo, S.; Uda, T.; Matsuoka, K.; Motojima, O.

In: Nuclear Fusion, Vol. 43, No. 8, 01.08.2003, p. 749-755.

Research output: Contribution to journalArticle

Yamada, H, Murakami, S, Yamazaki, K, Kaneko, O, Miyazawa, J, Sakamoto, R, Watanabe, KY, Narihara, K, Tanaka, K, Sakakibara, S, Osakabe, M, Peterson, BJ, Morita, S, Ida, K, Inagaki, S, Masuzaki, S, Morisaki, T, Rewoldt, G, Sugama, H, Nakajima, N, Cooper, WA, Akiyama, T, Ashikawa, N, Emoto, M, Funaba, H, Goncharov, P, Goto, M, Idei, H, Ikeda, K, Isobe, M, Kawahata, K, Kawazome, H, Khlopenkov, K, Kobuchi, T, Komori, A, Kostrioukov, A, Kubo, S, Kumazawa, R, Liang, Y, Minami, T, Muto, S, Mutoh, T, Nagayama, Y, Nakamura, Y, Nakanishi, H, Narushima, Y, Nishimura, K, Noda, N, Notake, T, Nozato, H, Ohdachi, S, Ohyabu, N, Oka, Y, Ozaki, T, Sagara, A, Saida, T, Saito, K, Sasao, M, Sato, K, Sato, M, Seki, T, Shimozuma, T, Shoji, M, Suzuki, H, Takeiri, Y, Takeuchi, N, Tamura, N, Toi, K, Tokuzawa, T, Torii, Y, Tsumori, K, Watanabe, T, Watari, T, Xu, Y, Yamada, I, Yamamoto, S, Yamamoto, T, Yokoyama, M, Yoshimura, Y, Yoshinuma, M, Mito, T, Itoh, K, Ohkubo, K, Ohtake, I, Satow, T, Sudo, S, Uda, T, Matsuoka, K & Motojima, O 2003, 'Impact of heat deposition profile on global confinement of NBI heated plasmas in the LHD', Nuclear Fusion, vol. 43, no. 8, pp. 749-755. https://doi.org/10.1088/0029-5515/43/8/317
Yamada H, Murakami S, Yamazaki K, Kaneko O, Miyazawa J, Sakamoto R et al. Impact of heat deposition profile on global confinement of NBI heated plasmas in the LHD. Nuclear Fusion. 2003 Aug 1;43(8):749-755. https://doi.org/10.1088/0029-5515/43/8/317
Yamada, H. ; Murakami, S. ; Yamazaki, K. ; Kaneko, O. ; Miyazawa, J. ; Sakamoto, R. ; Watanabe, K. Y. ; Narihara, K. ; Tanaka, K. ; Sakakibara, S. ; Osakabe, M. ; Peterson, B. J. ; Morita, S. ; Ida, K. ; Inagaki, S. ; Masuzaki, S. ; Morisaki, T. ; Rewoldt, G. ; Sugama, H. ; Nakajima, N. ; Cooper, W. A. ; Akiyama, T. ; Ashikawa, N. ; Emoto, M. ; Funaba, H. ; Goncharov, P. ; Goto, M. ; Idei, H. ; Ikeda, K. ; Isobe, M. ; Kawahata, K. ; Kawazome, H. ; Khlopenkov, K. ; Kobuchi, T. ; Komori, A. ; Kostrioukov, A. ; Kubo, S. ; Kumazawa, R. ; Liang, Y. ; Minami, T. ; Muto, S. ; Mutoh, T. ; Nagayama, Y. ; Nakamura, Y. ; Nakanishi, H. ; Narushima, Y. ; Nishimura, K. ; Noda, N. ; Notake, T. ; Nozato, H. ; Ohdachi, S. ; Ohyabu, N. ; Oka, Y. ; Ozaki, T. ; Sagara, A. ; Saida, T. ; Saito, K. ; Sasao, M. ; Sato, K. ; Sato, M. ; Seki, T. ; Shimozuma, T. ; Shoji, M. ; Suzuki, H. ; Takeiri, Y. ; Takeuchi, N. ; Tamura, N. ; Toi, K. ; Tokuzawa, T. ; Torii, Y. ; Tsumori, K. ; Watanabe, T. ; Watari, T. ; Xu, Y. ; Yamada, I. ; Yamamoto, S. ; Yamamoto, T. ; Yokoyama, M. ; Yoshimura, Y. ; Yoshinuma, M. ; Mito, T. ; Itoh, K. ; Ohkubo, K. ; Ohtake, I. ; Satow, T. ; Sudo, S. ; Uda, T. ; Matsuoka, K. ; Motojima, O. / Impact of heat deposition profile on global confinement of NBI heated plasmas in the LHD. In: Nuclear Fusion. 2003 ; Vol. 43, No. 8. pp. 749-755.
@article{2f27048a13224cfbb04b36a4fcde0ee8,
title = "Impact of heat deposition profile on global confinement of NBI heated plasmas in the LHD",
abstract = "Energy confinement and heat transport of net-current-free NBI heated plasmas in the large helical device (LHD) are discussed with emphasis on density and power deposition profile dependences. Although the apparent density dependence of the energy confinement time has been demonstrated in a wide parameter range in LHD, the loss of this dependence has been observed in the high density regime under specific conditions. Broad heat deposition due to off-axis alignment and shallow penetration of neutral beams degrades the global energy confinement while the local heat transport maintains a clear temperature dependence, lying between Bohm and gyro-Bohm characteristics. The central heat deposition tends towards an intrinsic density dependence like τE ∝ (n̄e/P)0.6 from the state where density dependence is lost. The broadening of the temperature profile due to the broad heat deposition profile contrasts with the invariant property that has been observed widely as profile resilience or stiffness in tokamak experiments. The confinement improvement as a result of the inward shift of the magnetic axis is obvious in the core region, which emphasizes the improvement of transport because of the geometry being unfavourable for the central heating of NBI in this configuration. The edge pressure, clearly, does not depend on the magnetic axis position. Unlike a tokamak H-mode, the edge pressure is determined by transport and can be increased by increasing the heating power.",
author = "H. Yamada and S. Murakami and K. Yamazaki and O. Kaneko and J. Miyazawa and R. Sakamoto and Watanabe, {K. Y.} and K. Narihara and K. Tanaka and S. Sakakibara and M. Osakabe and Peterson, {B. J.} and S. Morita and K. Ida and S. Inagaki and S. Masuzaki and T. Morisaki and G. Rewoldt and H. Sugama and N. Nakajima and Cooper, {W. A.} and T. Akiyama and N. Ashikawa and M. Emoto and H. Funaba and P. Goncharov and M. Goto and H. Idei and K. Ikeda and M. Isobe and K. Kawahata and H. Kawazome and K. Khlopenkov and T. Kobuchi and A. Komori and A. Kostrioukov and S. Kubo and R. Kumazawa and Y. Liang and T. Minami and S. Muto and T. Mutoh and Y. Nagayama and Y. Nakamura and H. Nakanishi and Y. Narushima and K. Nishimura and N. Noda and T. Notake and H. Nozato and S. Ohdachi and N. Ohyabu and Y. Oka and T. Ozaki and A. Sagara and T. Saida and K. Saito and M. Sasao and K. Sato and M. Sato and T. Seki and T. Shimozuma and M. Shoji and H. Suzuki and Y. Takeiri and N. Takeuchi and N. Tamura and K. Toi and T. Tokuzawa and Y. Torii and K. Tsumori and T. Watanabe and T. Watari and Y. Xu and I. Yamada and S. Yamamoto and T. Yamamoto and M. Yokoyama and Y. Yoshimura and M. Yoshinuma and T. Mito and K. Itoh and K. Ohkubo and I. Ohtake and T. Satow and S. Sudo and T. Uda and K. Matsuoka and O. Motojima",
year = "2003",
month = "8",
day = "1",
doi = "10.1088/0029-5515/43/8/317",
language = "English",
volume = "43",
pages = "749--755",
journal = "Nuclear Fusion",
issn = "0029-5515",
publisher = "IOP Publishing Ltd.",
number = "8",

}

TY - JOUR

T1 - Impact of heat deposition profile on global confinement of NBI heated plasmas in the LHD

AU - Yamada, H.

AU - Murakami, S.

AU - Yamazaki, K.

AU - Kaneko, O.

AU - Miyazawa, J.

AU - Sakamoto, R.

AU - Watanabe, K. Y.

AU - Narihara, K.

AU - Tanaka, K.

AU - Sakakibara, S.

AU - Osakabe, M.

AU - Peterson, B. J.

AU - Morita, S.

AU - Ida, K.

AU - Inagaki, S.

AU - Masuzaki, S.

AU - Morisaki, T.

AU - Rewoldt, G.

AU - Sugama, H.

AU - Nakajima, N.

AU - Cooper, W. A.

AU - Akiyama, T.

AU - Ashikawa, N.

AU - Emoto, M.

AU - Funaba, H.

AU - Goncharov, P.

AU - Goto, M.

AU - Idei, H.

AU - Ikeda, K.

AU - Isobe, M.

AU - Kawahata, K.

AU - Kawazome, H.

AU - Khlopenkov, K.

AU - Kobuchi, T.

AU - Komori, A.

AU - Kostrioukov, A.

AU - Kubo, S.

AU - Kumazawa, R.

AU - Liang, Y.

AU - Minami, T.

AU - Muto, S.

AU - Mutoh, T.

AU - Nagayama, Y.

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 - Ohyabu, N.

AU - Oka, Y.

AU - Ozaki, T.

AU - Sagara, A.

AU - Saida, T.

AU - Saito, K.

AU - Sasao, M.

AU - Sato, K.

AU - Sato, M.

AU - Seki, T.

AU - Shimozuma, T.

AU - Shoji, M.

AU - Suzuki, H.

AU - Takeiri, Y.

AU - Takeuchi, N.

AU - Tamura, N.

AU - Toi, K.

AU - Tokuzawa, T.

AU - Torii, Y.

AU - Tsumori, K.

AU - Watanabe, T.

AU - Watari, T.

AU - Xu, Y.

AU - Yamada, I.

AU - Yamamoto, S.

AU - Yamamoto, T.

AU - Yokoyama, M.

AU - Yoshimura, Y.

AU - Yoshinuma, M.

AU - Mito, T.

AU - Itoh, K.

AU - Ohkubo, K.

AU - Ohtake, I.

AU - Satow, T.

AU - Sudo, S.

AU - Uda, T.

AU - Matsuoka, K.

AU - Motojima, O.

PY - 2003/8/1

Y1 - 2003/8/1

N2 - Energy confinement and heat transport of net-current-free NBI heated plasmas in the large helical device (LHD) are discussed with emphasis on density and power deposition profile dependences. Although the apparent density dependence of the energy confinement time has been demonstrated in a wide parameter range in LHD, the loss of this dependence has been observed in the high density regime under specific conditions. Broad heat deposition due to off-axis alignment and shallow penetration of neutral beams degrades the global energy confinement while the local heat transport maintains a clear temperature dependence, lying between Bohm and gyro-Bohm characteristics. The central heat deposition tends towards an intrinsic density dependence like τE ∝ (n̄e/P)0.6 from the state where density dependence is lost. The broadening of the temperature profile due to the broad heat deposition profile contrasts with the invariant property that has been observed widely as profile resilience or stiffness in tokamak experiments. The confinement improvement as a result of the inward shift of the magnetic axis is obvious in the core region, which emphasizes the improvement of transport because of the geometry being unfavourable for the central heating of NBI in this configuration. The edge pressure, clearly, does not depend on the magnetic axis position. Unlike a tokamak H-mode, the edge pressure is determined by transport and can be increased by increasing the heating power.

AB - Energy confinement and heat transport of net-current-free NBI heated plasmas in the large helical device (LHD) are discussed with emphasis on density and power deposition profile dependences. Although the apparent density dependence of the energy confinement time has been demonstrated in a wide parameter range in LHD, the loss of this dependence has been observed in the high density regime under specific conditions. Broad heat deposition due to off-axis alignment and shallow penetration of neutral beams degrades the global energy confinement while the local heat transport maintains a clear temperature dependence, lying between Bohm and gyro-Bohm characteristics. The central heat deposition tends towards an intrinsic density dependence like τE ∝ (n̄e/P)0.6 from the state where density dependence is lost. The broadening of the temperature profile due to the broad heat deposition profile contrasts with the invariant property that has been observed widely as profile resilience or stiffness in tokamak experiments. The confinement improvement as a result of the inward shift of the magnetic axis is obvious in the core region, which emphasizes the improvement of transport because of the geometry being unfavourable for the central heating of NBI in this configuration. The edge pressure, clearly, does not depend on the magnetic axis position. Unlike a tokamak H-mode, the edge pressure is determined by transport and can be increased by increasing the heating power.

UR - http://www.scopus.com/inward/record.url?scp=0042420212&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0042420212&partnerID=8YFLogxK

U2 - 10.1088/0029-5515/43/8/317

DO - 10.1088/0029-5515/43/8/317

M3 - Article

AN - SCOPUS:0042420212

VL - 43

SP - 749

EP - 755

JO - Nuclear Fusion

JF - Nuclear Fusion

SN - 0029-5515

IS - 8

ER -