[Table of Contents]

Plasma and Fusion Research

Volume 3, S1033 (2008)

Regular Articles

Mercier Stability Improvement in Nonlinear Development of LHD Plasma
Katsuji ICHIGUCHI and Benjamin A. CARRERAS1)
National Institute for Fusion Science, 322-6 Oroshi-cho, Toki 509-5292, Japan
BACV Solutions Inc., 110 Mohawk, Oak Ridge, Tennessee 37831, USA
(Received 16 November 2007 / Accepted 10 January 2008 / Published 25 June 2008)


A stable path to high-beta plasmas is investigated for an inward-shifted LHD configuration. An improvement of Mercier stability is observed due to the nonlinear saturation of the resistive interchange modes. For this study, a multi-scale numerical scheme is used. In this scheme, the beta value is increased by adding a small pressure increment to the background pressure. We focus on the dependence of the Mercier stability on the profile of the pressure increment. It is found that the total pressure profile approaches a profile marginally stable to the Mercier criterion when the pressure increment has a fixed profile.


MHD, LHD, multi-scale simulation, Mercier criterion, interchange mode, nonlinear saturation, self-organization

DOI: 10.1585/pfr.3.S1033


  • [1] Y. Takeiri et al., Proc. of Joint Conf. 17th Int. Toki Conf. 16th Int. Stellarator/Heliotron Workshop 2007, Oct. 15-19, 2007, Toki, R-01 (2007).
  • [2] K. Ichiguchi et al., Nucl. Fusion 33, 481 (1993).
  • [3] K. Ichiguchi et al., Nucl. Fusion 43, 1101 (2003).
  • [4] K. Ichiguchi et al., Fusion Sci. Technol. 46, 34 (2004).
  • [5] K. Ichiguchi and B.A. Carreras, J. Plasma Phys. 72, 1117 (2006).
  • [6] S.P. Hirshman et al., Comput. Phys. Commun. 43, 143 (1986).
  • [7] A.H. Glasser, J.M. Greene and J.L. Johnson, Phys. Fluids 18, 875 (1975).

This paper may be cited as follows:

Katsuji ICHIGUCHI and Benjamin A. CARRERAS, Plasma Fusion Res. 3, S1033 (2008).