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Plasma response impact on RMP divertor footprint modeling for KSTAR. NUCLEAR MATERIALS AND ENERGY 2023. [DOI: 10.1016/j.nme.2023.101380] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
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Kobayashi T, Kobayashi M, Narushima Y, Suzuki Y, Watanabe KY, Mukai K, Hayashi Y. Self-Sustained Divertor Oscillation Driven by Magnetic Island Dynamics in Torus Plasma. PHYSICAL REVIEW LETTERS 2022; 128:085001. [PMID: 35275668 DOI: 10.1103/physrevlett.128.085001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/21/2021] [Revised: 12/10/2021] [Accepted: 01/12/2022] [Indexed: 06/14/2023]
Abstract
A new type of self-sustained divertor oscillation is discovered in the Large Helical Device stellarator, where the peripheral plasma is detached from material diverters by means of externally applied perturbation fields. The divertor oscillation is found to be a self-regulation of an isolated magnetic field structure (the magnetic island) width induced by a drastic change in a poloidal inhomogeneity of the plasma radiation across the detachment-attachment transitions. A predator-prey model between the magnetic island width and a self-generated local plasma current (the bootstrap current) is introduced to describe the divertor oscillation, which successfully reproduces the experimental observations.
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Affiliation(s)
- T Kobayashi
- National Institute for Fusion Science, National Institutes of Natural Sciences, Toki 509-5292, Japan
- The Graduate University for Advanced Studies, SOKENDAI, Toki 509-5292, Japan
| | - M Kobayashi
- National Institute for Fusion Science, National Institutes of Natural Sciences, Toki 509-5292, Japan
- The Graduate University for Advanced Studies, SOKENDAI, Toki 509-5292, Japan
| | - Y Narushima
- National Institute for Fusion Science, National Institutes of Natural Sciences, Toki 509-5292, Japan
- The Graduate University for Advanced Studies, SOKENDAI, Toki 509-5292, Japan
| | - Y Suzuki
- National Institute for Fusion Science, National Institutes of Natural Sciences, Toki 509-5292, Japan
- The Graduate University for Advanced Studies, SOKENDAI, Toki 509-5292, Japan
- Graduate School of Advanced Science and Engineering, Hiroshima University, Higashi-Hiroshima 739-8527, Japan
| | - K Y Watanabe
- National Institute for Fusion Science, National Institutes of Natural Sciences, Toki 509-5292, Japan
- Nagoya University, Graduate School of Engineering, Nagoya 464-8603, Japan
| | - K Mukai
- National Institute for Fusion Science, National Institutes of Natural Sciences, Toki 509-5292, Japan
- The Graduate University for Advanced Studies, SOKENDAI, Toki 509-5292, Japan
| | - Y Hayashi
- National Institute for Fusion Science, National Institutes of Natural Sciences, Toki 509-5292, Japan
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Lunt T, Bernert M, Brida D, Cavedon M, David P, Faitsch M, Feng Y, Griener M, Herrmann A, Kurzan B, Pan O, Plank U, Silvagni D, Teschke M, Willensdorfer M, Wischmeier M, Wolfrum E, Zammuto I. Study of detachment in future ASDEX Upgrade alternative divertor configurations by means of EMC3-EIRENE. NUCLEAR MATERIALS AND ENERGY 2021. [DOI: 10.1016/j.nme.2021.100950] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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