Plasma and Fusion Research

Volume 14, 3403100 (2019)

Regular Articles

Vacuum Configurations of D Shape Heliotron
Katsuji ICHIGUCHI1,2) and Yasuhiro SUZUKI1,2)
National Institute for Fusion Science, Toki 509-5292, Japan
SOKENDAI, The Graduate University for Advanced Studies, Toki 509-5292, Japan
(Received 10 January 2019 / Accepted 16 April 2019 / Published 19 June 2019)


The effects of the deformation of the flux surfaces into a “D shape” on vacuum heliotron configurations are examined numerically. In this study, one poloidal coil on the mid plane just inside the helical coils is assumed to be installed so that the current in the coil can deform the surface shape. Such deformation gives the advantage that the clearance between the helical coil and the outermost surface can be enlarged, which is crucial for the divertor action in heliotrons. The effects of the deformation on other vacuum properties are also discussed, such as rotational transform, magnetic well, and |B|min contour. We also focus on such effects on downsized configurations.


heliotron, vacuum magnetic configuration, numerical study, flux surface, divertor clearance, D shape

DOI: 10.1585/pfr.14.3403100


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