Three-dimensional Cauchy-condition surface method to identify the shape of the last closed magnetic surface in the Large Helical Device

Itagaki, Masafumi; Maeda, Tadaaki; Ishimaru, Takeshi; Okubo, Gaku; Watanabe, Kiyomasa; Seki, Ryosuke; Suzuki, Yasuhiro

Three-dimensional Cauchy-condition surface method to identify the shape of the last closed magnetic surface in the Large Helical Device

Itagaki, Masafumi; Maeda, Tadaaki; Ishimaru, Takeshi et al.

Plasma Physics and Controlled Fusion, 2011, 53(10), 105007

Permalink : https://hdl.handle.net/2115/47274

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アクセス権	open access
URI	https://hdl.handle.net/2115/47274
タイトル	Three-dimensional Cauchy-condition surface method to identify the shape of the last closed magnetic surface in the Large Helical Device
著者	Itagaki, Masafumi ; Maeda, Tadaaki ; Ishimaru, Takeshi ; Okubo, Gaku ; Watanabe, Kiyomasa ; Seki, Ryosuke ; Suzuki, Yasuhiro
e-Rad_Researcher 30281786 著者名 Itagaki, Masafumi
著者名 Maeda, Tadaaki
著者名 Ishimaru, Takeshi
著者名 Okubo, Gaku
著者名 Watanabe, Kiyomasa
著者名 Seki, Ryosuke
著者名 Suzuki, Yasuhiro
言語	英語
キーワード	nuclear fusion
	plasma boundary
	last closed magnetic surface
	Cauchy condition surface method
	magnetic sensor
	vector potential
	vacuum field
	boundary integral equation
発行日	2011-10
出版者	IOP Publishing
収録物名	Plasma Physics and Controlled Fusion
巻(号)	53(10)
ページ	105007
抄録	Kurihara's Cauchy-condition surface (CCS) method, originally developed for axisymmetric tokamak plasma, has been expanded to reconstruct the 3-D magnetic field profile outside the non-axisymmetric plasma in the Large Helical Device (LHD). The boundary integral equations (BIE) in terms of 3-D vector potential for magnetic field sensors, flux loops and points along the CCS are solved simultaneously. In the BIE for a flux loop, the portions related to the fundamental solution are integrated along the loop. The rotational symmetry of the plasma is incorporated into the formulation to reduce the number of unknowns. The reconstructed magnetic field caused only by the plasma current agree fairly well with the reference solution for the LHD, while a good agreement is observed when adding the coil current effect to the magnetic field. The magnetic field line tracing using the reconstructed field indicates the plasma boundary (the outer surface of the stochastic region) precisely and the last closed magnetic surface agrees fairly well with the reference one.
資源タイプ	学術雑誌論文
出版タイプ	Accepted Manuscript
権利情報	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 10.1088/0741-3335/53/10/105007.
PISSN	0741-3335
関連情報 (isVersionOf)	出版社版DOI https://doi.org/10.1088/0741-3335/53/10/105007