Characterization of Transition to Detachment of Magnetic Confinement Plasmas via Data Driven Approach in LHD
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- ISOBE Yugo
- Graduate School of Frontier Sciences, The University of Tokyo
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- YAMADA Hiroshi
- Graduate School of Frontier Sciences, The University of Tokyo
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- YOKOYAMA Tatsuya
- National Institutes of Quantum Science and Technology
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- KOBAYASHI Masahiro
- Graduate School of Frontier Sciences, The University of Tokyo National Institute for Fusion Science, National Institutes of Natural Sciences
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- IGARASHI Yasuhiko
- Tsukuba University
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- NARUSHIMA Yoshiro
- National Institute for Fusion Science, National Institutes of Natural Sciences The Graduate University for Advanced Studies, SOKENDAI
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- TAKEMURA Yuki
- National Institute for Fusion Science, National Institutes of Natural Sciences The Graduate University for Advanced Studies, SOKENDAI
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- SUZUKI Chihiro
- National Institute for Fusion Science, National Institutes of Natural Sciences The Graduate University for Advanced Studies, SOKENDAI
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- SAKAMOTO Ryuichi
- National Institute for Fusion Science, National Institutes of Natural Sciences The Graduate University for Advanced Studies, SOKENDAI
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<p>The transition condition from an attached state to a detached state of magnetic confinement plasmas has been investigated by a data-drive approach in LHD. This transition is defined as a binary classification problem of two states, and Support Vector Machine together with Exhaust Search has been applied. The boundary between detachment and attachment in the physical parameter space has been identified as a decision function comprising radiation and heating power, magnetic field and the resonant magnetic flux. While resonant magnetic perturbation (RMP) secures stable detached plasmas, it has been found that the featured parameter is not externally applied RMP itself but the plasma response to RMP. The present approach gives a robust separation boundary even for the extended operation with radiation enhancement by neon gas puff. Anomaly detection with a singular value decomposition has been also applied to the temporal behavior and identified pre- and post-relationships of each physical parameter in time. Emissions from carbon impurities with low ionization potential start to change prior to the RMP penetration and then the drop of ion saturation current, that is the transition to detachment, happens. These temporal sequences do not necessarily mean causality but are helpful for approach to physical inference.</p>
収録刊行物
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- Plasma and Fusion Research
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Plasma and Fusion Research 20 (0), n/a-, 2025-04-08
一般社団法人 プラズマ・核融合学会
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詳細情報 詳細情報について
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- CRID
- 1390303850076256896
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- ISSN
- 18806821
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- 本文言語コード
- en
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- データソース種別
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- JaLC
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- 抄録ライセンスフラグ
- 使用不可