2012
DOI: 10.1088/0741-3335/54/12/125003
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Use of a twisted 3D Cauchy condition surface to reconstruct the last closed magnetic surface in a non-axisymmetric fusion plasma

Abstract: The three-dimensional (3-D) Cauchy condition surface (CCS) method code, 'CCS3D', is now under development to reconstruct the 3-D magnetic field profile outside a non-axisymmetric fusion plasma using only magnetic sensor signals. A new "twisted CCS" has been introduced, whose elliptic cross section rotates with the variation in plasma geometry in the toroidal direction of a helical type device. Independent of the toroidal angle, this CCS can be placed at a certain distance from the last closed magnetic surface … Show more

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Cited by 11 publications
(31 citation statements)
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References 20 publications
(46 reference statements)
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“…Using the RBF expansion method [10], we fit the group of discrete points by tracing a magnetic field line on a poloidal cross section to a continuous curve. The curve is recognized as a quasi-magnetic surface.…”
Section: Rbf Expansion Methods For Constructing Quasi-magnetic Surfacesmentioning
confidence: 99%
See 2 more Smart Citations
“…Using the RBF expansion method [10], we fit the group of discrete points by tracing a magnetic field line on a poloidal cross section to a continuous curve. The curve is recognized as a quasi-magnetic surface.…”
Section: Rbf Expansion Methods For Constructing Quasi-magnetic Surfacesmentioning
confidence: 99%
“…In the conventional use of VMEC, the LCFS is adopted as the boundary. In contrast, this study uses the quasi-magnetic surface [10] and constructs Boozer-like coordinates in the stochastic region. The shape of the largest boundary should be extracted from the quasi-magnetic surfaces for the VMEC input.…”
Section: Construction Of the Reference Surfaces In The Stochastic Magmentioning
confidence: 99%
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“…[8]) that is applicable to 3D problems. Recently, the authors' research group developed the 3D Cauchy condition surface method [8,9] to reconstruct the 3D magnetic field profile outside the non-axisymmetric plasma in the LHD. This 3D CCS method is not a straight-forward extension of Kurihara's 2D CCS method.…”
Section: Introductionmentioning
confidence: 99%
“…The 10-fold rotational symmetry in the toroidal direction of the LHD was considered to reduce the number of unknowns [8][9][10]. However, the condition number [11] of the solution matrix still exceeds 10 15 in some cases.…”
Section: Introductionmentioning
confidence: 99%