Analysis method for magneto-mechanical coupled vibration of the in-vessel structures considering halo current effect and application to HL-2M tokamak

Xudong Li, Lei Xue, Zhenmao Chen, Yudong Pan, Tetsuya Uchimoto, Toshiyuki Takagi

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

The tokamak in-vessel structures serve in strong magnetic fields. During plasma disruptions such as the vertical displacement events, the induced eddy current and the injected halo current in in-vessel structures cause the vibration of the plasma-facing components. The vibration is coupled to the magnetic field in the form of the motional eddy current. Such magneto-mechanical coupling effect may have a considerable influence on the dynamic mechanical behavior of the in-vessel structures. This paper presents a numerical approach to analyze this magneto-mechanical coupled problem based on the hybrid method of the finite element and boundary element formulation. The plasma current and the halo current are taken into account in a form of a series of movable current filaments and a pair of current source and sink. The proposed approach is applied to the numerical analysis of a simplified model of the vacuum vessel of HL-2 M tokamak under an L-mode plasma disruption. Simulation results show that the vibration is strongly damped and the maximum vertical displacement is reduced by around 30 % when considering the magneto-mechanical coupling.

Original languageEnglish
Article number111612
JournalFusion Engineering and Design
Volume156
DOIs
Publication statusPublished - 2020 Jul

Keywords

  • FEM-BEM hybrid method
  • HL-2M
  • Halo current
  • Magneto-mechanical coupling
  • Numerical simulation

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Nuclear Energy and Engineering
  • Materials Science(all)
  • Mechanical Engineering

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