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Improved Three-Dimensional CCS Method Analysis for the Reconstruction of the Peripheral Magnetic Field Structure in a Finite Beta Helical Plasma

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Title: Improved Three-Dimensional CCS Method Analysis for the Reconstruction of the Peripheral Magnetic Field Structure in a Finite Beta Helical Plasma
Authors: ITAGAKI, Masafumi Browse this author →KAKEN DB
ISHIMARU, Kenzo 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
vacuum field
singular value decomposition
condition number
Issue Date: 15-Nov-2013
Publisher: The Japan Society of Plasma Science and Nuclear Fusion Research
Journal Title: Plasma and Fusion Research
Volume: 8
Start Page: 1402134
Publisher DOI: 10.1585/pfr.8.1402134
Abstract: In the previous 3D Cauchy-condition surface (CCS) method analysis to reconstruct the magnetic field profile in the Large Helical Device (LHD), one assumed an impractically large number of magnetic sensors, i.e., 440 field sensors and 126 flux loops. In the singular value decomposition (SVD) process employed in the CCS method, a gap is found in the magnitude of the singular values. The most accurate field results can be obtained if all the singular values smaller than the gap threshold are eliminated, independent of the number of boundary elements on the CCS and the number of sensors as well. With the reduction in the number of boundary elements, the required numbers of field sensors and flux loops are significantly reduced to 110 and 25, respectively, without losing the solution accuracy. They can be further reduced to 58 and 13 respectively if considering the symmetry of the field profile in the LHD. This result suggests the possibility of actual application to the LHD.
Type: article
URI: http://hdl.handle.net/2115/58438
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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