MHD Equilibrium Reconstruction Using the Visible Light Tomographic Method with Laplacian Eigenfunction

• SUZUKI Kosuke

  Kyoto University

• MURAKAMI Sadayoshi

  Kyoto University

• OHDACHI Satoshi

  National Institute for Fusion Science

• IDEI Hiroshi

  The Research Institute for Applied Mechanics, Kyushu University

• KURODA Kengoh

  The Research Institute for Applied Mechanics, Kyushu University

• IKEZOE Ryuya

  The Research Institute for Applied Mechanics, Kyushu University

• ONCHI Takumi

  The Research Institute for Applied Mechanics, Kyushu University

Abstract

A tomographic method using tangential visible light is proposed for MHD equilibrium reconstruction via two processes. The first process is a tomographic method to estimate the last-closed-flux-surface (LCFS) in two-dimensional poloidal cross-section using a single tangential camera image. Applying the Laplacian eigenfunction series expansion and L₁ regularization, we can reconstruct the LCFS from relatively sparse and noisy observations. The second method is a free-boundary tokamak equilibrium calculation using the TASK/EQU code, in which we use the estimated plasma surface information as the constraints for the equilibrium calculation. As a result, we develop a new method for identifying equilibrium states using visible light information.

Journal

• Plasma and Fusion Research

  Plasma and Fusion Research 16 (0), 2402090-2402090, 2021-07-05

  The Japan Society of Plasma Science and Nuclear Fusion Research

Keywords

• equilibrium
• tomography
• series expansion
• Laplacian eigenfunction
• <i>L</i>₁regularization

Details

• CRID: 1390288691668596864
• NII Article ID: 130008064613
• DOI: 10.1585/pfr.16.2402090
• ISSN: 18806821
• Web Site: https://www.jstage.jst.go.jp/article/pfr/16/0/16_2402090/_pdf
• Text Lang: en
• Data Source:
  • JaLC
  • Crossref
  • CiNii Articles
  • KAKEN
• Abstract License Flag: Disallowed