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Reconstruction of the Eddy Current Distribution on the Vacuum Vessel in a Reversed Field Pinch Device based on the External Magnetic Sensor Signals

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Title: Reconstruction of the Eddy Current Distribution on the Vacuum Vessel in a Reversed Field Pinch Device based on the External Magnetic Sensor Signals
Authors: ITAGAKI, Masafumi Browse this author →KAKEN DB
SANPEI, Akio Browse this author
MASAMUNE, Sadao Browse this author
WATANABE, Kiyomasa Browse this author
Keywords: reversed field pinch
RELAX
eddy current
Cauchy condition surface method
singular boundary integral
modified truncated SVD method
Issue Date: 7-May-2014
Publisher: The Japan Society of Plasma Science and Nuclear Fusion Research
Journal Title: Plasma and Fusion Research
Volume: 9
Start Page: 1402046
Publisher DOI: 10.1585/pfr.9.1402046
Abstract: For the MHD equilibrium reconstruction of a reverse field pinch device, it is a big issue to identify accurately the strong eddy current flow on the shell. In the present work, boundary integrals of the eddy current along the shell are added to the conventional Cauchy-condition surface method formulation. The eddy current profile is unknown in advance but straightforwardly identified using only the signals from magnetic sensors located outside the plasma. Two ideas are introduced to overcome the numerical difficulties encountered in the problem. One is an accurate boundary integral scheme to damp out the near singularity occurring at the sensor position very close to the shell. The other is the modified truncated singular value decomposition technique to solve an ill-conditioned matrix equation when a large number of nodal points exist on the shell. The capability of the new method is demonstrated for a test problem modeling the RELAX device.
Type: article
URI: http://hdl.handle.net/2115/58439
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)

Submitter: 板垣 正文

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