High β experiment and confinement regimes in a compact helical system

K. Matsuoka, S. Okamura, K. Nishimura, K. Tsumori, R. Akiyama, H. Yamada, S. Sakakibara, A. Lazaros, J. Xu, K. Ida, K. Tanaka, T. Morisaki, S. Morita, H. Arimoto, A. Ejiri, M. Fujiwara, H. Idei, H. Iguchi, O. Kaneko, T. KawamotoS. Kubo, T. Kuroda, O. Motojima, T. Ozaki, V. D. Pustovitov, A. Sagara, C. Takahashi, K. Toi, T. Watari, I. Yamada

研究成果: Contribution to journalArticle査読

6 被引用数 (Scopus)


A volume-averaged equilibrium β value 〈βeq〉 of 2.14% is achieved in a compact helical system using two neutral beam lines with balanced injection and intense wall conditioning with Ti gettering. This value is the highest β value realized so far in helical systems. Reheat mode, where the stored energy increases after turn-off of a strong gas puff, is employed in the experiment. Discharge conditions are as follows: Bt = 0.61 T; beam power through the port, 1.1 MW (coinjection) and 0.8 MW (counterinjection); line-averaged electron density ne = 6.5 × 1013cm-3. Amplitudes of magnetic fluctuations integrated over the frequency range from 3 kHz to 100 kHz become saturated at 〈βeq〉 higher than 1%. Dominant coherent modes are m n = 2 1 and 1 1 when 〈βeq〉 is lower and higher respectively than 1%. Dependence of the energy confinement time τE on ne (up to 8 × 1013 cm-3) and Bt (from 0.6 to 1.8T) is also studied in this high β experiment. When the density increases τE degrades compared with the LHD scaling; the density dependence exhibits Bohm-like behaviour. On the contrary, τE scales as Bt≈0.75, which is rather close to the LHD scaling (gyro-Bohm-like behaviour).

ジャーナルFusion Engineering and Design
出版ステータス出版済み - 1 1 1995

All Science Journal Classification (ASJC) codes

  • 土木構造工学
  • 原子力エネルギーおよび原子力工学
  • 材料科学(全般)
  • 機械工学


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