Identification of Ballooning-Type Pressure Driven Instability by Tomographic Reconstruction

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  • TAKEDA Kentaro
    Graduate School of Advanced Science and Engineering, Hiroshima University
  • SUZUKI Yasuhiro
    Graduate School of Advanced Science and Engineering, Hiroshima University
  • TAKEMURA Yuki
    National Institute for Fusion Science, National Institutes of Natural Sciences The Graduate University for Advanced Studies, SOKENDAI
  • TANAKA Kenji
    National Institute for Fusion Science, National Institutes of Natural Sciences Interdisciplinary Graduate School of Engineering Sciences, Kyushu University
  • KINOSHITA Toshiki
    Research Institute for Applied Mechanics, Kyushu University
  • SAKAI Hikona
    Interdisciplinary Graduate School of Engineering Sciences, Kyushu University

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Description

<p>This paper deals with the experimental identification of the mode structure for the CDC by the tomographic reconstruction. Theoretically, it was predicted the CDC is triggered by the high-n ballooning mode. In the experiment, the localized density fluctuations at the outboard side are observed at the onset, and this is evidence that the ballooning-like instability triggers the CDC. Still, it was not well confirmed because the mode structure is not experimentally understood yet. To understand the mode structure, a new tomographic reconstruction is developed by coupling the Fourier-Bessel series expansion method and sparse modeling with L1 regularization. Using this, the ballooning-like mode structure of the density fluctuations is successfully reconstructed at the precursor.</p>

Journal

  • Plasma and Fusion Research

    Plasma and Fusion Research 20 (0), n/a-, 2025

    The Japan Society of Plasma Science and Nuclear Fusion Research

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