Comprehensive Analysis on the Role of Helical Movement of the Magnetic Axis in Stellarators

Shoichi OKAMURA

doi:10.1585/pfr.9.3402031

Regular Articles

Comprehensive Analysis on the Role of Helical Movement of the Magnetic Axis in Stellarators

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Keywords: stellarator, magnetic configuration, helical axis, non-planar axis, Fourier modes, boundary shape, magnetic axis

JOURNAL FREE ACCESS

2014 Volume 9 Pages 3402031

DOI https://doi.org/10.1585/pfr.9.3402031

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Abstract

The physical confinement properties of stellarators are analyzed for the neo-classical transport and the magnetic well. Three typical concepts of stellarators (LHD, Wendelstein 7-X and TJ-II) are compared in terms of the helical movement of cross sections of the last closed magnetic surface. It is shown that this geometric element strongly determines the confinement properties of both non-planar axis and planar axis stellarators.

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