Characteristics of the global energy confinement and central pressure in LHD

J. Miyazawa, H. Yamada, R. Sakamoto, H. Funaba, K. Y. Watanabe, S. Sakakibara, K. Ida, M. Goto, T. Morisaki, S. Murakami, S. Inagaki

研究成果: Contribution to journalArticle査読

10 被引用数 (Scopus)

抄録

Global energy confinement in the Large Helical Device has been proved to be comparable to those of tokamaks in ELMy H-mode. It shows a gyro-Bohm-like property as seen in international stellarator scalings. This implies that the anomalous transport dominates the neoclassical transport. At least in the configurations with small helical ripples, no significant collisionality dependence predicted by the neoclassical theory has been observed. Confinement degradation compared with the international stellarator scalings often takes place in the plasmas with high peripheral density. In many cases, this is due to the shallow penetration of heating beams. Adding to this, deviation from gyro-Bohm can be caused by the emergence of a "weak temperature dependence" of the thermal dijfusivity. It depends on the plasma parameters whether this weak temperature dependence deteriorates or improves the thermal transport. The central pressure that is also an important parameter for envisioning a fusion reactor is not necessarily proportional to the global confinement. The central pressure is insensitive to the variation of magnetic configuration that strongly affects the global confinement.

本文言語英語
ページ(範囲)29-37
ページ数9
ジャーナルFusion Science and Technology
58
1
DOI
出版ステータス出版済み - 1 1 2010

All Science Journal Classification (ASJC) codes

  • 土木構造工学
  • 核物理学および高エネルギー物理学
  • 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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