[Table of Contents]

Plasma and Fusion Research

Volume 8, 2403157 (2013)

Regular Articles

Analysis Method for the Low-Order Resistive Interchange Instability in LHD with Stochastic Magnetic Field Line Structure
Ryosuke UEDA, Masahiko SATO1), Kiyomasa WATANABE1), Yutaka MATSUMOTO, Yasuhiro SUZUKI1), Masafumi ITAGAKI, Shun-ichi OIKAWA and Yasushi TODO1)
Graduate School of Engineering Hokkaido University, Sapporo 060-8628, Japan
1)
National Institute for Fusion Science, 322-6 Oroshi-cho, Toki 509-5292, Japan
(Received 9 December 2012 / Accepted 21 June 2013 / Published 15 November 2013)

Abstract

In Large Helical Device experiments, independent low-order magnetic fluctuations due to the resistive interchange mode are commonly observed; investigating the characteristics of this instability is our ultimate goal. Two new methods for analyzing the single low-order instability in the stochastic region are developed. One method investigates it by constructing the initial single-mode perturbation. The other method investigates it by constructing a reference surface outside the last closed flux surface. The reference surface is necessary for constructing the coordinates that are used to extract the Fourier mode in the stochastic field line structure.

Keywords

magnetohydrodynamics, resistive interchange mode, LHD, stochastic region, RBF expansion method

DOI: 10.1585/pfr.8.2403157

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References

  • [1] K.Y. Watanabe et al., Phys. Plasmas 18, 056119 (2011).
  • [2] W.A. Copper, Plasma Phys. Control. Fusion 34, 1011 (1992).
  • [3] C. Nührenberg, Phys. Plasmas 6, 137 (1999).
  • [4] K. Ichiguchi, N. Nakajima, M. Wakatani et al., Nucl. Fusion 43, 1011 (2003).
  • [5] Y. Todo, N. Nakajima, M. Sato and H. Miura, Plasma Fusion Res. 5, S2062 (2010).
  • [6] M. Sato, N. Nakajima, K.Y. Watanabe et al., 24th IAEA FEC 2012, TH/P3-25 (2012).
  • [7] A.H. Boozer, Phys. Fluids 24, 1999 (1981).
  • [8] S.P. Hirshman, W.I. van Rij and P. Merkel, Comput. Phys. Commun. 43, 143 (1986).
  • [9] K. Harafujim T. Hayashi and T. Sato, J. Comput. Phys. 81, 169 (1989).
  • [10] M. Itagaki, G. Okubo, M. Akazawa et al., Plasma Phys. Control. Fusion 54, 125003 (2012).
  • [11] S.P. Hirshman et al., Phys. Fluids 28, 1387 (1985).

This paper may be cited as follows:

Ryosuke UEDA, Masahiko SATO, Kiyomasa WATANABE, Yutaka MATSUMOTO, Yasuhiro SUZUKI, Masafumi ITAGAKI, Shun-ichi OIKAWA and Yasushi TODO, Plasma Fusion Res. 8, 2403157 (2013).