Study of transition mechanism based on poloidal ion viscosity using biasing electrode in heliotron J

H. Takahashi; S. Kitajima; K. Ishii; Y. Sato; J. Tachibana; S. Koike; T. Oku; M. Yokoyama; Y. Suzuki; S. Satake; S. Yamamoto; S. Ohshima; H. Okada; K. Nagasaki; S. Kobayashi; T. Minami; T. Mizuuchi; F. Sano

Study of transition mechanism based on poloidal ion viscosity using biasing electrode in heliotron J

H. Takahashi, S. Kitajima, K. Ishii, Y. Sato, J. Tachibana, S. Koike, T. Oku, M. Yokoyama, Y. Suzuki, S. Satake, S. Yamamoto, S. Ohshima, H. Okada, K. Nagasaki, S. Kobayashi, T. Minami, T. Mizuuchi, F. Sano

ENG - Quantum Science and Energy Engineering

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

Abstract

An improved confinement could be successfully achieved by an electrode biasing in the Heliotron J. The increases of n_e and n _eT_e, the decrease of the potential fluctuation and the formation of strong negative E_r were observed. The nonlinearity in the plasma resistance was found in the transition region and the clear hysteresis was observed. An intermittent transition phenomenon was found in the marginal-biasing condition. In the discharge, forward and backward transition repetitively occurred. This is considered due to the spontaneous change of the normalized poloidal torque around the transition threshold.

Original language	English
Title of host publication	40th EPS Conference on Plasma Physics, EPS 2013
Publisher	European Physical Society (EPS)
Pages	794-797
Number of pages	4
ISBN (Print)	9781632663108
Publication status	Published - 2013 Jan 1
Event	40th EPS Conference on Plasma Physics, EPS 2013 - Espoo, Finland Duration: 2013 Jul 1 → 2013 Jul 5

Publication series

Name	40th EPS Conference on Plasma Physics, EPS 2013
Volume	1

Other

Other	40th EPS Conference on Plasma Physics, EPS 2013
Country	Finland
City	Espoo
Period	13/7/1 → 13/7/5

ASJC Scopus subject areas

Atomic and Molecular Physics, and Optics

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Takahashi, H., Kitajima, S., Ishii, K., Sato, Y., Tachibana, J., Koike, S., Oku, T., Yokoyama, M., Suzuki, Y., Satake, S., Yamamoto, S., Ohshima, S., Okada, H., Nagasaki, K., Kobayashi, S., Minami, T., Mizuuchi, T., & Sano, F. (2013). Study of transition mechanism based on poloidal ion viscosity using biasing electrode in heliotron J. In 40th EPS Conference on Plasma Physics, EPS 2013 (pp. 794-797). (40th EPS Conference on Plasma Physics, EPS 2013; Vol. 1). European Physical Society (EPS).

Study of transition mechanism based on poloidal ion viscosity using biasing electrode in heliotron J. / Takahashi, H.; Kitajima, S.; Ishii, K.; Sato, Y.; Tachibana, J.; Koike, S.; Oku, T.; Yokoyama, M.; Suzuki, Y.; Satake, S.; Yamamoto, S.; Ohshima, S.; Okada, H.; Nagasaki, K.; Kobayashi, S.; Minami, T.; Mizuuchi, T.; Sano, F.

40th EPS Conference on Plasma Physics, EPS 2013. European Physical Society (EPS), 2013. p. 794-797 (40th EPS Conference on Plasma Physics, EPS 2013; Vol. 1).

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

Takahashi, H, Kitajima, S, Ishii, K, Sato, Y, Tachibana, J, Koike, S, Oku, T, Yokoyama, M, Suzuki, Y, Satake, S, Yamamoto, S, Ohshima, S, Okada, H, Nagasaki, K, Kobayashi, S, Minami, T, Mizuuchi, T & Sano, F 2013, Study of transition mechanism based on poloidal ion viscosity using biasing electrode in heliotron J. in 40th EPS Conference on Plasma Physics, EPS 2013. 40th EPS Conference on Plasma Physics, EPS 2013, vol. 1, European Physical Society (EPS), pp. 794-797, 40th EPS Conference on Plasma Physics, EPS 2013, Espoo, Finland, 13/7/1.

Takahashi, H. ; Kitajima, S. ; Ishii, K. ; Sato, Y. ; Tachibana, J. ; Koike, S. ; Oku, T. ; Yokoyama, M. ; Suzuki, Y. ; Satake, S. ; Yamamoto, S. ; Ohshima, S. ; Okada, H. ; Nagasaki, K. ; Kobayashi, S. ; Minami, T. ; Mizuuchi, T. ; Sano, F. / Study of transition mechanism based on poloidal ion viscosity using biasing electrode in heliotron J. 40th EPS Conference on Plasma Physics, EPS 2013. European Physical Society (EPS), 2013. pp. 794-797 (40th EPS Conference on Plasma Physics, EPS 2013).

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title = "Study of transition mechanism based on poloidal ion viscosity using biasing electrode in heliotron J",

abstract = "An improved confinement could be successfully achieved by an electrode biasing in the Heliotron J. The increases of ne and n eTe, the decrease of the potential fluctuation and the formation of strong negative Er were observed. The nonlinearity in the plasma resistance was found in the transition region and the clear hysteresis was observed. An intermittent transition phenomenon was found in the marginal-biasing condition. In the discharge, forward and backward transition repetitively occurred. This is considered due to the spontaneous change of the normalized poloidal torque around the transition threshold.",

author = "H. Takahashi and S. Kitajima and K. Ishii and Y. Sato and J. Tachibana and S. Koike and T. Oku and M. Yokoyama and Y. Suzuki and S. Satake and S. Yamamoto and S. Ohshima and H. Okada and K. Nagasaki and S. Kobayashi and T. Minami and T. Mizuuchi and F. Sano",

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T1 - Study of transition mechanism based on poloidal ion viscosity using biasing electrode in heliotron J

AU - Takahashi, H.

AU - Kitajima, S.

AU - Ishii, K.

AU - Sato, Y.

AU - Tachibana, J.

AU - Koike, S.

AU - Oku, T.

AU - Yokoyama, M.

AU - Suzuki, Y.

AU - Satake, S.

AU - Yamamoto, S.

AU - Ohshima, S.

AU - Okada, H.

AU - Nagasaki, K.

AU - Kobayashi, S.

AU - Minami, T.

AU - Mizuuchi, T.

AU - Sano, F.

PY - 2013/1/1

Y1 - 2013/1/1

N2 - An improved confinement could be successfully achieved by an electrode biasing in the Heliotron J. The increases of ne and n eTe, the decrease of the potential fluctuation and the formation of strong negative Er were observed. The nonlinearity in the plasma resistance was found in the transition region and the clear hysteresis was observed. An intermittent transition phenomenon was found in the marginal-biasing condition. In the discharge, forward and backward transition repetitively occurred. This is considered due to the spontaneous change of the normalized poloidal torque around the transition threshold.

AB - An improved confinement could be successfully achieved by an electrode biasing in the Heliotron J. The increases of ne and n eTe, the decrease of the potential fluctuation and the formation of strong negative Er were observed. The nonlinearity in the plasma resistance was found in the transition region and the clear hysteresis was observed. An intermittent transition phenomenon was found in the marginal-biasing condition. In the discharge, forward and backward transition repetitively occurred. This is considered due to the spontaneous change of the normalized poloidal torque around the transition threshold.

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BT - 40th EPS Conference on Plasma Physics, EPS 2013

PB - European Physical Society (EPS)

T2 - 40th EPS Conference on Plasma Physics, EPS 2013

Y2 - 1 July 2013 through 5 July 2013

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