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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

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Plasma Phys. Control. Fusion, 54, 125003 (2012).pdf3.37 MBPDFView/Open
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Title: Use of a twisted 3D Cauchy condition surface to reconstruct the last closed magnetic surface in a non-axisymmetric fusion plasma
Authors: Itagaki, Masafumi Browse this author →KAKEN DB
Okubo, Gaku Browse this author
Akazawa, Masayuki Browse this author
Matsumoto, Yutaka Browse this author
Watanabe, Kiyomasa Browse this author
Seki, Ryosuke Browse this author
Suzuki, Yasuhiro Browse this author
Keywords: magnetic sensor
plasma boundary
last closed magnetic surface
Cauchy condition surface method
twisted Cauchy condition surface
vacuum field
boundary integral equation
Issue Date: Dec-2012
Publisher: IOP Publishing
Journal Title: Plasma Physics and Controlled Fusion
Volume: 54
Issue: 12
Start Page: 125003
Publisher DOI: 10.1088/0741-3335/54/12/125003
Abstract: The three-dimensional (3D) Cauchy condition surface (CCS) method code, 'CCS3D', is now under development to reconstruct the 3D magnetic field profile outside a non-axisymmetric fusion plasma using only magnetic sensor signals. A new 'twisted CCS' is 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 (LCMS). With this new CCS, it is found through test calculations for the Large Helical Device that the numerical accuracy in the reconstructed field is improved. Furthermore, the magnetic field line tracing indicates the LCMS more precisely than with the use of the axisymmetric CCS. A new idea to determine the LCMS numerically is also proposed.
Rights: Copyright © 2012 IOP Publishing Ltd.This is an author-created, un-copyedited version of an article accepted for publication in Plasma Physics and Controlled Fusion. IOP Publishing Ltd is not responsible for any errors or omissions in this version of the manuscript or any version derived from it. The definitive publisher-authenticated version is available online at 10.1088/0741-3335/54/12/125003
Type: article (author version)
Appears in Collections:工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

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