Difference in electron transport between co- and counter-nbi-heated plasmas in the inward-shifted configurations on LHD

Hisamichi Funaba; Nobuyoshi Ohyabu; Yasuhiko Takeiri; Kiyomasa Watanabe; Shin Kubo; Takashi Shimozuma; Katsumi Ida; Junichi Miyazawa; Ryuichi Sakamoto; Kenichi Nagaoka; Kenji Tanaka; Byron Jay Peterson; Masaki Osakabe; Yoshio Nagayama; Shigeru Inagaki; Yoshiro Narushima; Satoru Sakakibara; Sadayoshi Murakami

doi:10.13182/FST04-A564

Difference in electron transport between co- and counter-nbi-heated plasmas in the inward-shifted configurations on LHD

Hisamichi Funaba, Nobuyoshi Ohyabu, Yasuhiko Takeiri, Kiyomasa Watanabe, Shin Kubo, Takashi Shimozuma, Katsumi Ida, Junichi Miyazawa, Ryuichi Sakamoto, Kenichi Nagaoka, Kenji Tanaka, Byron Jay Peterson, Masaki Osakabe, Yoshio Nagayama, Shigeru Inagaki, Yoshiro Narushima, Satoru Sakakibara, Sadayoshi Murakami

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

3 Citations (Scopus)

Abstract

In the low-density plasmas of the Large Helical Device, the shape of the electron temperature profile changes depending on the direction of the tangential neutral beam injection (NBI) when the magnetic axis position is inward-shifted at R = 3.50 m. Core flattening was observed in plasmas heated by counter-NBI. The electron thermal diffusivities in co-NBI and counter-NBI-heated plasmas are compared. The diffusivity becomes large at the central region in the case of counter-NBI. This result shows that the flattening in the electron temperature profile is not caused simply by a change in the power deposition only. Some magnetic fluctuations are seen during counter-NBI. On the other hand, it is a promising feature that the electron thermal diffusivity at the peripheral region does not increase with the heating power in co-NBI plasmas.

Original language	English
Pages (from-to)	262-270
Number of pages	9
Journal	Fusion Science and Technology
Volume	46
Issue number	2
DOIs	https://doi.org/10.13182/FST04-A564
Publication status	Published - Sept 2004
Externally published	Yes

All Science Journal Classification (ASJC) codes

Civil and Structural Engineering
Nuclear and High Energy Physics
Nuclear Energy and Engineering
Materials Science(all)
Mechanical Engineering

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10.13182/FST04-A564

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Funaba, H., Ohyabu, N., Takeiri, Y., Watanabe, K., Kubo, S., Shimozuma, T., Ida, K., Miyazawa, J., Sakamoto, R., Nagaoka, K., Tanaka, K., Peterson, B. J., Osakabe, M., Nagayama, Y., Inagaki, S., Narushima, Y., Sakakibara, S., & Murakami, S. (2004). Difference in electron transport between co- and counter-nbi-heated plasmas in the inward-shifted configurations on LHD. Fusion Science and Technology, 46(2), 262-270. https://doi.org/10.13182/FST04-A564

Funaba, H, Ohyabu, N, Takeiri, Y, Watanabe, K, Kubo, S, Shimozuma, T, Ida, K, Miyazawa, J, Sakamoto, R, Nagaoka, K, Tanaka, K, Peterson, BJ, Osakabe, M, Nagayama, Y, Inagaki, S, Narushima, Y, Sakakibara, S & Murakami, S 2004, 'Difference in electron transport between co- and counter-nbi-heated plasmas in the inward-shifted configurations on LHD', Fusion Science and Technology, vol. 46, no. 2, pp. 262-270. https://doi.org/10.13182/FST04-A564

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title = "Difference in electron transport between co- and counter-nbi-heated plasmas in the inward-shifted configurations on LHD",

abstract = "In the low-density plasmas of the Large Helical Device, the shape of the electron temperature profile changes depending on the direction of the tangential neutral beam injection (NBI) when the magnetic axis position is inward-shifted at R = 3.50 m. Core flattening was observed in plasmas heated by counter-NBI. The electron thermal diffusivities in co-NBI and counter-NBI-heated plasmas are compared. The diffusivity becomes large at the central region in the case of counter-NBI. This result shows that the flattening in the electron temperature profile is not caused simply by a change in the power deposition only. Some magnetic fluctuations are seen during counter-NBI. On the other hand, it is a promising feature that the electron thermal diffusivity at the peripheral region does not increase with the heating power in co-NBI plasmas.",

author = "Hisamichi Funaba and Nobuyoshi Ohyabu and Yasuhiko Takeiri and Kiyomasa Watanabe and Shin Kubo and Takashi Shimozuma and Katsumi Ida and Junichi Miyazawa and Ryuichi Sakamoto and Kenichi Nagaoka and Kenji Tanaka and Peterson, {Byron Jay} and Masaki Osakabe and Yoshio Nagayama and Shigeru Inagaki and Yoshiro Narushima and Satoru Sakakibara and Sadayoshi Murakami",

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doi = "10.13182/FST04-A564",

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T1 - Difference in electron transport between co- and counter-nbi-heated plasmas in the inward-shifted configurations on LHD

AU - Funaba, Hisamichi

AU - Ohyabu, Nobuyoshi

AU - Takeiri, Yasuhiko

AU - Watanabe, Kiyomasa

AU - Kubo, Shin

AU - Shimozuma, Takashi

AU - Ida, Katsumi

AU - Miyazawa, Junichi

AU - Sakamoto, Ryuichi

AU - Nagaoka, Kenichi

AU - Tanaka, Kenji

AU - Peterson, Byron Jay

AU - Osakabe, Masaki

AU - Nagayama, Yoshio

AU - Inagaki, Shigeru

AU - Narushima, Yoshiro

AU - Sakakibara, Satoru

AU - Murakami, Sadayoshi

PY - 2004/9

Y1 - 2004/9

N2 - In the low-density plasmas of the Large Helical Device, the shape of the electron temperature profile changes depending on the direction of the tangential neutral beam injection (NBI) when the magnetic axis position is inward-shifted at R = 3.50 m. Core flattening was observed in plasmas heated by counter-NBI. The electron thermal diffusivities in co-NBI and counter-NBI-heated plasmas are compared. The diffusivity becomes large at the central region in the case of counter-NBI. This result shows that the flattening in the electron temperature profile is not caused simply by a change in the power deposition only. Some magnetic fluctuations are seen during counter-NBI. On the other hand, it is a promising feature that the electron thermal diffusivity at the peripheral region does not increase with the heating power in co-NBI plasmas.

AB - In the low-density plasmas of the Large Helical Device, the shape of the electron temperature profile changes depending on the direction of the tangential neutral beam injection (NBI) when the magnetic axis position is inward-shifted at R = 3.50 m. Core flattening was observed in plasmas heated by counter-NBI. The electron thermal diffusivities in co-NBI and counter-NBI-heated plasmas are compared. The diffusivity becomes large at the central region in the case of counter-NBI. This result shows that the flattening in the electron temperature profile is not caused simply by a change in the power deposition only. Some magnetic fluctuations are seen during counter-NBI. On the other hand, it is a promising feature that the electron thermal diffusivity at the peripheral region does not increase with the heating power in co-NBI plasmas.

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Difference in electron transport between co- and counter-nbi-heated plasmas in the inward-shifted configurations on LHD

Abstract

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