Reheat mode discharges in search of attainable high stored energy and density limit of compact helical system

M. Isobe; K. Nagaoka; Y. Yoshimura; T. Minami; T. Akiyama; C. Suzuki; S. Nishimura; K. Nakamura; A. Shimizu; C. Takahashi; K. Toi; K. Matsuoka; S. Okamura; H. Matsushita; S. Murakami

doi:10.13182/FST06-A1240

Reheat mode discharges in search of attainable high stored energy and density limit of compact helical system

M. Isobe, K. Nagaoka, Y. Yoshimura, T. Minami, T. Akiyama, C. Suzuki, S. Nishimura, K. Nakamura, A. Shimizu, C. Takahashi, K. Toi, K. Matsuoka, S. Okamura, H. Matsushita, S. Murakami

Division of Nuclear Fusion Dynamics

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

7 Citations (Scopus)

Abstract

The results of experiments to attain high stored energy and density in the Compact Helical System (CHS) are reported. The experiments have been carried out under the maximum neutral beam heating power and highest magnetic field strength of the CHS. With the help of the reheat mode, we have so far reached a stored energy of 9.4 kJ and a density limit expressed as n_c = 0.65·(P_abs·B_t/V_P)^0.5 for the CHS. In the high-density regime, the confinement of CHS plasma is limited by radiation collapse. A multichannel H_α light detector system shows an asymmetric feature in the poloidal cross section and indicates that confinement degradation in the high-density regime begins at the inboard side where the CHS plasma is close to the vacuum vessel wall.

Original language	English
Pages (from-to)	229-235
Number of pages	7
Journal	Fusion Science and Technology
Volume	50
Issue number	2
DOIs	https://doi.org/10.13182/FST06-A1240
Publication status	Published - Aug 2006

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/FST06-A1240

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Isobe, M., Nagaoka, K., Yoshimura, Y., Minami, T., Akiyama, T., Suzuki, C., Nishimura, S., Nakamura, K., Shimizu, A., Takahashi, C., Toi, K., Matsuoka, K., Okamura, S., Matsushita, H., & Murakami, S. (2006). Reheat mode discharges in search of attainable high stored energy and density limit of compact helical system. Fusion Science and Technology, 50(2), 229-235. https://doi.org/10.13182/FST06-A1240

Isobe, M, Nagaoka, K, Yoshimura, Y, Minami, T, Akiyama, T, Suzuki, C, Nishimura, S, Nakamura, K, Shimizu, A, Takahashi, C, Toi, K, Matsuoka, K, Okamura, S, Matsushita, H & Murakami, S 2006, 'Reheat mode discharges in search of attainable high stored energy and density limit of compact helical system', Fusion Science and Technology, vol. 50, no. 2, pp. 229-235. https://doi.org/10.13182/FST06-A1240

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abstract = "The results of experiments to attain high stored energy and density in the Compact Helical System (CHS) are reported. The experiments have been carried out under the maximum neutral beam heating power and highest magnetic field strength of the CHS. With the help of the reheat mode, we have so far reached a stored energy of 9.4 kJ and a density limit expressed as nc = 0.65·(Pabs·Bt/VP)0.5 for the CHS. In the high-density regime, the confinement of CHS plasma is limited by radiation collapse. A multichannel Hα light detector system shows an asymmetric feature in the poloidal cross section and indicates that confinement degradation in the high-density regime begins at the inboard side where the CHS plasma is close to the vacuum vessel wall.",

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T1 - Reheat mode discharges in search of attainable high stored energy and density limit of compact helical system

AU - Isobe, M.

AU - Nagaoka, K.

AU - Yoshimura, Y.

AU - Minami, T.

AU - Akiyama, T.

AU - Suzuki, C.

AU - Nishimura, S.

AU - Nakamura, K.

AU - Shimizu, A.

AU - Takahashi, C.

AU - Toi, K.

AU - Matsuoka, K.

AU - Okamura, S.

AU - Matsushita, H.

AU - Murakami, S.

PY - 2006/8

Y1 - 2006/8

N2 - The results of experiments to attain high stored energy and density in the Compact Helical System (CHS) are reported. The experiments have been carried out under the maximum neutral beam heating power and highest magnetic field strength of the CHS. With the help of the reheat mode, we have so far reached a stored energy of 9.4 kJ and a density limit expressed as nc = 0.65·(Pabs·Bt/VP)0.5 for the CHS. In the high-density regime, the confinement of CHS plasma is limited by radiation collapse. A multichannel Hα light detector system shows an asymmetric feature in the poloidal cross section and indicates that confinement degradation in the high-density regime begins at the inboard side where the CHS plasma is close to the vacuum vessel wall.

AB - The results of experiments to attain high stored energy and density in the Compact Helical System (CHS) are reported. The experiments have been carried out under the maximum neutral beam heating power and highest magnetic field strength of the CHS. With the help of the reheat mode, we have so far reached a stored energy of 9.4 kJ and a density limit expressed as nc = 0.65·(Pabs·Bt/VP)0.5 for the CHS. In the high-density regime, the confinement of CHS plasma is limited by radiation collapse. A multichannel Hα light detector system shows an asymmetric feature in the poloidal cross section and indicates that confinement degradation in the high-density regime begins at the inboard side where the CHS plasma is close to the vacuum vessel wall.

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JO - Fusion Science and Technology

JF - Fusion Science and Technology

IS - 2

ER -

Reheat mode discharges in search of attainable high stored energy and density limit of compact helical system

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