Experimental study of current driven MHD mode in LHD

Y. Narushima; S. Sakakibara; K. Y. Watanabe; S. Ohdachi; Inagaki Shigeru; K. Ida; H. Yamada; K. Narihara; T. Tokuzawa; K. Ichiguchi; T. Yamaguchi; K. Tanaka; Y. Takeiri; W. A. Cooper

Experimental study of current driven MHD mode in LHD

Y. Narushima, S. Sakakibara, K. Y. Watanabe, S. Ohdachi, Inagaki Shigeru, K. Ida, H. Yamada, K. Narihara, T. Tokuzawa, K. Ichiguchi, T. Yamaguchi, K. Tanaka, Y. Takeiri, W. A. Cooper

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

Abstract

The current driven MHD mode has been studied in LHD plasmas. When the Ip reaches a certain value, the energy confinement degrades without any noticeable precursor. The electron temperature profile shows a large flat region, which leads to the modification of the profile mainly in the core region. The attainable current becomes lower with increasing beta, which is consistent with the prediction of the MHD stability analysis. However, there are quantitative differences of the attainable current between the experimental results and theoretical predictions. Taking into account the beam pressure, the MHD analysis shows that the m/n=1/1 mode is destabilized and the current driven term is comparable to the pressure one. A similar behaviour of the collapse is also observed in a configuration whose magnetic hill is extremely large. For further research of the current driven mode, it is necessary to produce a higher field plasma to reduce the beam pressure component.

Original language	English
Title of host publication	32nd EPS Conference on Plasma Physics 2005, EPS 2005, Held with the 8th International Workshop on Fast Ignition of Fusion Targets - Europhysics Conference Abstracts
Pages	1002-1005
Number of pages	4
Publication status	Published - 2005
Externally published	Yes
Event	32nd European Physical Society Conference on Plasma Physics and Controlled Fusion combined with the 8th International Workshop on Fast Ignition of Fusion Targets - Tarragona, Spain Duration: Jun 27 2005 → Jul 1 2005

Publication series

Name	32nd EPS Conference on Plasma Physics 2005, EPS 2005, Held with the 8th International Workshop on Fast Ignition of Fusion Targets - Europhysics Conference Abstracts
Volume	2

Other

Other	32nd European Physical Society Conference on Plasma Physics and Controlled Fusion combined with the 8th International Workshop on Fast Ignition of Fusion Targets
Country/Territory	Spain
City	Tarragona
Period	6/27/05 → 7/1/05

All Science Journal Classification (ASJC) codes

Atomic and Molecular Physics, and Optics

Cite this

Narushima, Y., Sakakibara, S., Watanabe, K. Y., Ohdachi, S., Shigeru, I., Ida, K., Yamada, H., Narihara, K., Tokuzawa, T., Ichiguchi, K., Yamaguchi, T., Tanaka, K., Takeiri, Y., & Cooper, W. A. (2005). Experimental study of current driven MHD mode in LHD. In 32nd EPS Conference on Plasma Physics 2005, EPS 2005, Held with the 8th International Workshop on Fast Ignition of Fusion Targets - Europhysics Conference Abstracts (pp. 1002-1005). (32nd EPS Conference on Plasma Physics 2005, EPS 2005, Held with the 8th International Workshop on Fast Ignition of Fusion Targets - Europhysics Conference Abstracts; Vol. 2).

Experimental study of current driven MHD mode in LHD. / Narushima, Y.; Sakakibara, S.; Watanabe, K. Y. et al.
32nd EPS Conference on Plasma Physics 2005, EPS 2005, Held with the 8th International Workshop on Fast Ignition of Fusion Targets - Europhysics Conference Abstracts. 2005. p. 1002-1005 (32nd EPS Conference on Plasma Physics 2005, EPS 2005, Held with the 8th International Workshop on Fast Ignition of Fusion Targets - Europhysics Conference Abstracts; Vol. 2).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

Narushima, Y, Sakakibara, S, Watanabe, KY, Ohdachi, S, Shigeru, I, Ida, K, Yamada, H, Narihara, K, Tokuzawa, T, Ichiguchi, K, Yamaguchi, T, Tanaka, K, Takeiri, Y & Cooper, WA 2005, Experimental study of current driven MHD mode in LHD. in 32nd EPS Conference on Plasma Physics 2005, EPS 2005, Held with the 8th International Workshop on Fast Ignition of Fusion Targets - Europhysics Conference Abstracts. 32nd EPS Conference on Plasma Physics 2005, EPS 2005, Held with the 8th International Workshop on Fast Ignition of Fusion Targets - Europhysics Conference Abstracts, vol. 2, pp. 1002-1005, 32nd European Physical Society Conference on Plasma Physics and Controlled Fusion combined with the 8th International Workshop on Fast Ignition of Fusion Targets, Tarragona, Spain, 6/27/05.

Narushima Y, Sakakibara S, Watanabe KY, Ohdachi S, Shigeru I, Ida K et al. Experimental study of current driven MHD mode in LHD. In 32nd EPS Conference on Plasma Physics 2005, EPS 2005, Held with the 8th International Workshop on Fast Ignition of Fusion Targets - Europhysics Conference Abstracts. 2005. p. 1002-1005. (32nd EPS Conference on Plasma Physics 2005, EPS 2005, Held with the 8th International Workshop on Fast Ignition of Fusion Targets - Europhysics Conference Abstracts).

Narushima, Y. ; Sakakibara, S. ; Watanabe, K. Y. et al. / Experimental study of current driven MHD mode in LHD. 32nd EPS Conference on Plasma Physics 2005, EPS 2005, Held with the 8th International Workshop on Fast Ignition of Fusion Targets - Europhysics Conference Abstracts. 2005. pp. 1002-1005 (32nd EPS Conference on Plasma Physics 2005, EPS 2005, Held with the 8th International Workshop on Fast Ignition of Fusion Targets - Europhysics Conference Abstracts).

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author = "Y. Narushima and S. Sakakibara and Watanabe, {K. Y.} and S. Ohdachi and Inagaki Shigeru and K. Ida and H. Yamada and K. Narihara and T. Tokuzawa and K. Ichiguchi and T. Yamaguchi and K. Tanaka and Y. Takeiri and Cooper, {W. A.}",

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AU - Narushima, Y.

AU - Sakakibara, S.

AU - Watanabe, K. Y.

AU - Ohdachi, S.

AU - Shigeru, Inagaki

AU - Ida, K.

AU - Yamada, H.

AU - Narihara, K.

AU - Tokuzawa, T.

AU - Ichiguchi, K.

AU - Yamaguchi, T.

AU - Tanaka, K.

AU - Takeiri, Y.

AU - Cooper, W. A.

PY - 2005

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AB - The current driven MHD mode has been studied in LHD plasmas. When the Ip reaches a certain value, the energy confinement degrades without any noticeable precursor. The electron temperature profile shows a large flat region, which leads to the modification of the profile mainly in the core region. The attainable current becomes lower with increasing beta, which is consistent with the prediction of the MHD stability analysis. However, there are quantitative differences of the attainable current between the experimental results and theoretical predictions. Taking into account the beam pressure, the MHD analysis shows that the m/n=1/1 mode is destabilized and the current driven term is comparable to the pressure one. A similar behaviour of the collapse is also observed in a configuration whose magnetic hill is extremely large. For further research of the current driven mode, it is necessary to produce a higher field plasma to reduce the beam pressure component.

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BT - 32nd EPS Conference on Plasma Physics 2005, EPS 2005, Held with the 8th International Workshop on Fast Ignition of Fusion Targets - Europhysics Conference Abstracts

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ER -

Experimental study of current driven MHD mode in LHD

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