Identification of Ballooning-Type Pressure Driven Instability by Tomographic Reconstruction

DOI Web Site 参考文献8件
  • 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

書誌事項

公開日
2025
DOI
  • 10.1585/pfr.20.1202037
公開者
一般社団法人 プラズマ・核融合学会

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説明

<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>

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