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Title
  • en Three-dimensional Cauchy-condition surface method to identify the shape of the last closed magnetic surface in the Large Helical Device
Creator
    • en Maeda, Tadaaki
    • en Ishimaru, Takeshi
    • en Okubo, Gaku
    • en Watanabe, Kiyomasa
    • en Seki, Ryosuke
    • en Suzuki, Yasuhiro
Accessrights open access
Rights
  • en 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.
Subject
  • Other en nuclear fusion
  • Other en plasma boundary
  • Other en last closed magnetic surface
  • Other en Cauchy condition surface method
  • Other en magnetic sensor
  • Other en vector potential
  • Other en vacuum field
  • Other en boundary integral equation
  • NDC 427
Description
  • Abstract en 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.
Publisher en IOP Publishing
Date
    Issued2011-10
Language
  • eng
Resource Type journal article
Version Type AM
Identifier HDL http://hdl.handle.net/2115/47274
Relation
  • isVersionOf DOI https://doi.org/10.1088/0741-3335/53/10/105007
Journal
    • PISSN 0741-3335
      • en Plasma Physics and Controlled Fusion
      • Volume Number53 Issue Number10 Page Start105007
File
Oaidate 2023-07-26