Back

Title
  • en Improved Three-Dimensional CCS Method Analysis for the Reconstruction of the Peripheral Magnetic Field Structure in a Finite Beta Helical Plasma
Creator
    • en ISHIMARU, Kenzo
    • en MATSUMOTO, Yutaka
    • en WATANABE, Kiyomasa
    • en SEKI, Ryosuke
    • en SUZUKI, Yasuhiro
Accessrights open access
Subject
  • Other en magnetic sensor
  • Other en plasma boundary
  • Other en last closed magnetic surface
  • Other en Cauchy condition surface method
  • Other en vacuum field
  • Other en singular value decomposition
  • Other en condition number
  • NDC 427
Description
  • Abstract en 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.
Publisher en The Japan Society of Plasma Science and Nuclear Fusion Research
Date
    Issued2013-11-15
Language
  • eng
Resource Type journal article
Version Type VoR
Identifier HDL http://hdl.handle.net/2115/58438
Relation
  • isIdenticalTo DOI https://doi.org/10.1585/pfr.8.1402134
Journal
    • EISSN 1880-6821
      • en Plasma and Fusion Research
      • Volume Number8 Page Start1402134
File
Oaidate 2023-07-26