Transition phenomena and thermal transport properties in LHD plasmas with an electron internal transport barrier

T. Shimozuma; S. Kubo; H. Idei; Inagaki Shigeru; N. Tamura; T. Tokuzawa; T. Morisaki; K. Y. Watanabe; K. Ida; I. Yamada; K. Narihara; S. Muto; M. Yokoyama; Y. Yoshimura; T. Notake; K. Ohkubo; T. Seki; K. Saito; R. Kumazawa; T. Mutoh; T. Watari; A. Komori

doi:10.1088/0029-5515/45/11/021

Transition phenomena and thermal transport properties in LHD plasmas with an electron internal transport barrier

T. Shimozuma, S. Kubo, H. Idei, Inagaki Shigeru, N. Tamura, T. Tokuzawa, T. Morisaki, K. Y. Watanabe, K. Ida, I. Yamada, K. Narihara, S. Muto, M. Yokoyama, Y. Yoshimura, T. Notake, K. Ohkubo, T. Seki, K. Saito, R. Kumazawa, T. MutohT. Watari, A. Komori

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

29 Citations (Scopus)

Abstract

Two types of improved core confinement were observed during centrally focused electron cyclotron heating (ECH) into plasmas sustained by counter (CNTR) and Co neutral beam injections (NBI) in the Large Helical Device. The CNTR NBI plasma displayed transition phenomena to the high-electron-temperature state and had a clear electron internal transport barrier, while the Co NBI plasma did not show a clear transition or an ECH power threshold but showed broad high temperature profiles with moderate temperature gradient. This indicated that the Co NBI plasma with additional ECH also had an improved core confinement. The electron heat transport characteristics of these plasmas were directly investigated using heat pulse propagation excited by modulated ECH. These effects appear to be related to the m/n = 2/1 rational surface or the island induced by NBI beam-driven current.

Original language	English
Pages (from-to)	1396-1403
Number of pages	8
Journal	Nuclear Fusion
Volume	45
Issue number	11
DOIs	https://doi.org/10.1088/0029-5515/45/11/021
Publication status	Published - Oct 25 2005

All Science Journal Classification (ASJC) codes

Nuclear and High Energy Physics
Condensed Matter Physics

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10.1088/0029-5515/45/11/021

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Shimozuma, T., Kubo, S., Idei, H., Shigeru, I., Tamura, N., Tokuzawa, T., Morisaki, T., Watanabe, K. Y., Ida, K., Yamada, I., Narihara, K., Muto, S., Yokoyama, M., Yoshimura, Y., Notake, T., Ohkubo, K., Seki, T., Saito, K., Kumazawa, R., ... Komori, A. (2005). Transition phenomena and thermal transport properties in LHD plasmas with an electron internal transport barrier. Nuclear Fusion, 45(11), 1396-1403. https://doi.org/10.1088/0029-5515/45/11/021

Shimozuma, T, Kubo, S, Idei, H, Shigeru, I, Tamura, N, Tokuzawa, T, Morisaki, T, Watanabe, KY, Ida, K, Yamada, I, Narihara, K, Muto, S, Yokoyama, M, Yoshimura, Y, Notake, T, Ohkubo, K, Seki, T, Saito, K, Kumazawa, R, Mutoh, T, Watari, T & Komori, A 2005, 'Transition phenomena and thermal transport properties in LHD plasmas with an electron internal transport barrier', Nuclear Fusion, vol. 45, no. 11, pp. 1396-1403. https://doi.org/10.1088/0029-5515/45/11/021

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abstract = "Two types of improved core confinement were observed during centrally focused electron cyclotron heating (ECH) into plasmas sustained by counter (CNTR) and Co neutral beam injections (NBI) in the Large Helical Device. The CNTR NBI plasma displayed transition phenomena to the high-electron-temperature state and had a clear electron internal transport barrier, while the Co NBI plasma did not show a clear transition or an ECH power threshold but showed broad high temperature profiles with moderate temperature gradient. This indicated that the Co NBI plasma with additional ECH also had an improved core confinement. The electron heat transport characteristics of these plasmas were directly investigated using heat pulse propagation excited by modulated ECH. These effects appear to be related to the m/n = 2/1 rational surface or the island induced by NBI beam-driven current.",

author = "T. Shimozuma and S. Kubo and H. Idei and Inagaki Shigeru and N. Tamura and T. Tokuzawa and T. Morisaki and Watanabe, {K. Y.} and K. Ida and I. Yamada and K. Narihara and S. Muto and M. Yokoyama and Y. Yoshimura and T. Notake and K. Ohkubo and T. Seki and K. Saito and R. Kumazawa and T. Mutoh and T. Watari and A. Komori",

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T1 - Transition phenomena and thermal transport properties in LHD plasmas with an electron internal transport barrier

AU - Shimozuma, T.

AU - Kubo, S.

AU - Idei, H.

AU - Shigeru, Inagaki

AU - Tamura, N.

AU - Tokuzawa, T.

AU - Morisaki, T.

AU - Watanabe, K. Y.

AU - Ida, K.

AU - Yamada, I.

AU - Narihara, K.

AU - Muto, S.

AU - Yokoyama, M.

AU - Yoshimura, Y.

AU - Notake, T.

AU - Ohkubo, K.

AU - Seki, T.

AU - Saito, K.

AU - Kumazawa, R.

AU - Mutoh, T.

AU - Watari, T.

AU - Komori, A.

PY - 2005/10/25

Y1 - 2005/10/25

N2 - Two types of improved core confinement were observed during centrally focused electron cyclotron heating (ECH) into plasmas sustained by counter (CNTR) and Co neutral beam injections (NBI) in the Large Helical Device. The CNTR NBI plasma displayed transition phenomena to the high-electron-temperature state and had a clear electron internal transport barrier, while the Co NBI plasma did not show a clear transition or an ECH power threshold but showed broad high temperature profiles with moderate temperature gradient. This indicated that the Co NBI plasma with additional ECH also had an improved core confinement. The electron heat transport characteristics of these plasmas were directly investigated using heat pulse propagation excited by modulated ECH. These effects appear to be related to the m/n = 2/1 rational surface or the island induced by NBI beam-driven current.

AB - Two types of improved core confinement were observed during centrally focused electron cyclotron heating (ECH) into plasmas sustained by counter (CNTR) and Co neutral beam injections (NBI) in the Large Helical Device. The CNTR NBI plasma displayed transition phenomena to the high-electron-temperature state and had a clear electron internal transport barrier, while the Co NBI plasma did not show a clear transition or an ECH power threshold but showed broad high temperature profiles with moderate temperature gradient. This indicated that the Co NBI plasma with additional ECH also had an improved core confinement. The electron heat transport characteristics of these plasmas were directly investigated using heat pulse propagation excited by modulated ECH. These effects appear to be related to the m/n = 2/1 rational surface or the island induced by NBI beam-driven current.

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VL - 45

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EP - 1403

JO - Nuclear Fusion

JF - Nuclear Fusion

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ER -

Transition phenomena and thermal transport properties in LHD plasmas with an electron internal transport barrier

Abstract

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