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 proceedingConference 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 languageEnglish
Title of host publication32nd EPS Conference on Plasma Physics 2005, EPS 2005, Held with the 8th International Workshop on Fast Ignition of Fusion Targets - Europhysics Conference Abstracts
Pages1002-1005
Number of pages4
Publication statusPublished - Dec 1 2005
Externally publishedYes
Event32nd 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 2005Jul 1 2005

Publication series

Name32nd EPS Conference on Plasma Physics 2005, EPS 2005, Held with the 8th International Workshop on Fast Ignition of Fusion Targets - Europhysics Conference Abstracts
Volume2

Other

Other32nd European Physical Society Conference on Plasma Physics and Controlled Fusion combined with the 8th International Workshop on Fast Ignition of Fusion Targets
CountrySpain
CityTarragona
Period6/27/057/1/05

Fingerprint

low currents
predictions
temperature profiles
electron energy
profiles
configurations
energy

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

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 proceedingConference 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. ; Ohdachi, S. ; Shigeru, Inagaki ; Ida, K. ; Yamada, H. ; Narihara, K. ; Tokuzawa, T. ; Ichiguchi, K. ; Yamaguchi, T. ; Tanaka, K. ; Takeiri, Y. ; Cooper, W. A. / 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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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.

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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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