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Title
  • en Use of a twisted 3D Cauchy condition surface to reconstruct the last closed magnetic surface in a non-axisymmetric fusion plasma
Creator
    • en Okubo, Gaku
    • en Akazawa, Masayuki
    • en Matsumoto, Yutaka
    • en Watanabe, Kiyomasa
    • en Seki, Ryosuke
    • en Suzuki, Yasuhiro
Accessrights open access
Rights
  • en Copyright © 2012 IOP Publishing Ltd.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 10.1088/0741-3335/54/12/125003
Subject
  • Other en magnetic sensor
  • Other en plasma boundary
  • Other en last closed magnetic surface
  • Other en Cauchy condition surface method
  • Other en twisted Cauchy condition surface
  • Other en vacuum field
  • Other en boundary integral equation
  • NDC 427
Description
  • Abstract en The three-dimensional (3D) Cauchy condition surface (CCS) method code, 'CCS3D', is now under development to reconstruct the 3D magnetic field profile outside a non-axisymmetric fusion plasma using only magnetic sensor signals. A new 'twisted CCS' is introduced, whose elliptic cross-section rotates with the variation in plasma geometry in the toroidal direction of a helical-type device. Independent of the toroidal angle, this CCS can be placed at a certain distance from the last closed magnetic surface (LCMS). With this new CCS, it is found through test calculations for the Large Helical Device that the numerical accuracy in the reconstructed field is improved. Furthermore, the magnetic field line tracing indicates the LCMS more precisely than with the use of the axisymmetric CCS. A new idea to determine the LCMS numerically is also proposed.
Publisher en IOP Publishing
Date
    Issued2012-12
Language
  • eng
Resource Type journal article
Version Type AM
Identifier HDL http://hdl.handle.net/2115/58436
Relation
  • isVersionOf DOI https://doi.org/10.1088/0741-3335/54/12/125003
Journal
    • PISSN 0741-3335
    • EISSN 1361-6587
      • en Plasma Physics and Controlled Fusion
      • Volume Number54 Issue Number12 Page Start125003
File
Oaidate 2023-07-26