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Three-dimensional Cauchy-condition surface method to identify the shape of the last closed magnetic surface in the Large Helical Device
| Title: | Three-dimensional Cauchy-condition surface method to identify the shape of the last closed magnetic surface in the Large Helical Device |
| Authors: | Itagaki, Masafumi Browse this author →KAKEN DB | | Maeda, Tadaaki Browse this author | | Ishimaru, Takeshi Browse this author | | Okubo, Gaku Browse this author | | Watanabe, Kiyomasa Browse this author | | Seki, Ryosuke Browse this author | | Suzuki, Yasuhiro Browse this author |
| Keywords: | nuclear fusion | | plasma boundary | | last closed magnetic surface | | Cauchy condition surface method | | magnetic sensor | | vector potential | | vacuum field | | boundary integral equation |
| Issue Date: | Oct-2011 |
| Publisher: | IOP Publishing |
| Journal Title: | Plasma Physics and Controlled Fusion |
| Volume: | 53 |
| Issue: | 10 |
| Start Page: | 105007 |
| Publisher DOI: | 10.1088/0741-3335/53/10/105007 |
| Abstract: | 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. |
| Rights: | 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. |
| Type: | article (author version) |
| URI: | http://hdl.handle.net/2115/47274 |
| 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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Submitter: 板垣 正文
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