Nonlinear excitation of energetic particle driven geodesic acoustic mode by resonance overlap with Alfvén instability in ASDEX Upgrade
Abstract The Alfvén instability nonlinearly excited the energetic-particle-driven geodesic acoustic mode on the ASDEX-Upgrade tokamak, as demonstrated experimentally. The mechanism of the energetic-particle-driven geodesic acoustic mode excitation and the mode nonlinear evolution is not yet fully un...
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| Format: | Article |
| Language: | English |
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Nature Portfolio
2025-01-01
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| Series: | Scientific Reports |
| Online Access: | https://doi.org/10.1038/s41598-024-82577-3 |
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| _version_ | 1841544688339779584 |
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| author | Hao Wang Philipp Lauber Yasushi Todo Yasuhiro Suzuki Hanzheng Li Malik Idouakass Jialei Wang Panith Adulsiriswad The ASDEX Upgrade Team |
| author_facet | Hao Wang Philipp Lauber Yasushi Todo Yasuhiro Suzuki Hanzheng Li Malik Idouakass Jialei Wang Panith Adulsiriswad The ASDEX Upgrade Team |
| author_sort | Hao Wang |
| collection | DOAJ |
| description | Abstract The Alfvén instability nonlinearly excited the energetic-particle-driven geodesic acoustic mode on the ASDEX-Upgrade tokamak, as demonstrated experimentally. The mechanism of the energetic-particle-driven geodesic acoustic mode excitation and the mode nonlinear evolution is not yet fully understood. In the present work, a first-principles simulation using the MEGA code investigated the mode properties in both the linear growth and nonlinear saturated phases. Here we show that the simulation successfully reproduced the excitation and coexistence of these two modes, and agreed with the experimental results well. Conclusive evidence showed that the resonance overlap is the excitation mechanism of the energetic-particle-driven geodesic acoustic mode. In the linear growth phase, energetic particles that satisfied different resonance conditions excited the Alfvén instability, which then caused energetic particle redistribution in phase space. These redistributed energetic particles caused resonance overlap, exciting the energetic-particle-driven geodesic acoustic mode in the nonlinear phase. |
| format | Article |
| id | doaj-art-a72ed3bdd7ed42f7acb2766163595527 |
| institution | Kabale University |
| issn | 2045-2322 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | Nature Portfolio |
| record_format | Article |
| series | Scientific Reports |
| spelling | doaj-art-a72ed3bdd7ed42f7acb27661635955272025-01-12T12:21:01ZengNature PortfolioScientific Reports2045-23222025-01-0115111110.1038/s41598-024-82577-3Nonlinear excitation of energetic particle driven geodesic acoustic mode by resonance overlap with Alfvén instability in ASDEX UpgradeHao Wang0Philipp Lauber1Yasushi Todo2Yasuhiro Suzuki3Hanzheng Li4Malik Idouakass5Jialei Wang6Panith Adulsiriswad7The ASDEX Upgrade TeamNational Institute for Fusion Science, National Institutes of Natural SciencesMax-Planck-Institut für PlasmaphysikNational Institute for Fusion Science, National Institutes of Natural SciencesGraduate School of Advanced Science and Engineering, Hiroshima UniversityNational Institute for Fusion Science, National Institutes of Natural SciencesNational Institute for Fusion Science, National Institutes of Natural SciencesNational Institute for Fusion Science, National Institutes of Natural SciencesNational Institutes for Quantum Science and TechnologyAbstract The Alfvén instability nonlinearly excited the energetic-particle-driven geodesic acoustic mode on the ASDEX-Upgrade tokamak, as demonstrated experimentally. The mechanism of the energetic-particle-driven geodesic acoustic mode excitation and the mode nonlinear evolution is not yet fully understood. In the present work, a first-principles simulation using the MEGA code investigated the mode properties in both the linear growth and nonlinear saturated phases. Here we show that the simulation successfully reproduced the excitation and coexistence of these two modes, and agreed with the experimental results well. Conclusive evidence showed that the resonance overlap is the excitation mechanism of the energetic-particle-driven geodesic acoustic mode. In the linear growth phase, energetic particles that satisfied different resonance conditions excited the Alfvén instability, which then caused energetic particle redistribution in phase space. These redistributed energetic particles caused resonance overlap, exciting the energetic-particle-driven geodesic acoustic mode in the nonlinear phase.https://doi.org/10.1038/s41598-024-82577-3 |
| spellingShingle | Hao Wang Philipp Lauber Yasushi Todo Yasuhiro Suzuki Hanzheng Li Malik Idouakass Jialei Wang Panith Adulsiriswad The ASDEX Upgrade Team Nonlinear excitation of energetic particle driven geodesic acoustic mode by resonance overlap with Alfvén instability in ASDEX Upgrade Scientific Reports |
| title | Nonlinear excitation of energetic particle driven geodesic acoustic mode by resonance overlap with Alfvén instability in ASDEX Upgrade |
| title_full | Nonlinear excitation of energetic particle driven geodesic acoustic mode by resonance overlap with Alfvén instability in ASDEX Upgrade |
| title_fullStr | Nonlinear excitation of energetic particle driven geodesic acoustic mode by resonance overlap with Alfvén instability in ASDEX Upgrade |
| title_full_unstemmed | Nonlinear excitation of energetic particle driven geodesic acoustic mode by resonance overlap with Alfvén instability in ASDEX Upgrade |
| title_short | Nonlinear excitation of energetic particle driven geodesic acoustic mode by resonance overlap with Alfvén instability in ASDEX Upgrade |
| title_sort | nonlinear excitation of energetic particle driven geodesic acoustic mode by resonance overlap with alfven instability in asdex upgrade |
| url | https://doi.org/10.1038/s41598-024-82577-3 |
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