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Comparative Study of Magnetic Field Configurations of LHD and CHS based on the Boundary Shape Analysis

Shoichi OKAMURA^1,2) and Yasuhiro SUZUKI^1,2)

1)

National Institute for Fusion Science, 322-6 Oroshi, Toki 509-5292, Japan

2)

Fusion Science Department, The Graduate University for Advanced Studies, 322-6 Oroshi, Toki 509-5292, Japan

(Received 27 December 2010 / Accepted 8 March 2011 / Published 1 July 2011)

Abstract

In order to understand the confinement characteristics of different types of stellarators from the common point of view, characteristics of the geometric shape of the last closed magnetic surfaces are analyzed in terms of the Fourier modes. Magnetic configurations of LHD and CHS are compared for their different operational modes with shifted magnetic axis positions. Total number of Fourier modes is reduced for their outward shifted configurations to find out the essential modes for creating magnetic well. It is shown that the helical axis structure is important for the control of magnetic field configuration even for the planar-axis stellarators (heliotrons) of LHD and CHS.

Copyright (c) 2011 The Japan Society of Plasma Science and Nuclear Fusion Research

Keywords

Fourier mode, boundary shape, LHD, CHS, magnetic configuration, magnetic well, helical axis

DOI: 10.1585/pfr.6.2403048

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References

• [1] A. Komori et al., Fusion Sci. Technol. 58, 1 (2010).
• [2] H. Yamada et al., Nucl. Fusion 45, 1684 (2005).
• [3] S. Hirshman et al., Comput. Phys. Commun. 43, 143 (1986).
• [4] S. Okamura, Contrib. Plasma Phys. 50, 562 (2010).

This paper may be cited as follows:

Shoichi OKAMURA and Yasuhiro SUZUKI, Plasma Fusion Res. 6, 2403048 (2011).