Gyrokinetic profile prediction and validation of a negative triangularity plasma in ASDEX Upgrade
In this work, gyrokinetic simulations are performed with the CGYRO code (Candy et al 2016 J. Comput. Phys. 324 73–93) for a negative triangularity H-mode plasma in ASDEX Upgrade, and compared with experimental measurements. The PORTALS framework (Rodriguez-Fernandez et al 2024 Nucl. Fusion 64 076034...
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IOP Publishing
2025-01-01
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| Series: | Nuclear Fusion |
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| Online Access: | https://doi.org/10.1088/1741-4326/adef68 |
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| author | R. Bielajew B. Vanovac N.T. Howard P. Rodriguez-Fernandez L. Aucone G.D. Conway T. Happel C. Holland P. Mantica J. Schellpfeffer C. Yoo A.E. White the EUROfusion WPTE Team the ASDEX Upgrade Team |
| author_facet | R. Bielajew B. Vanovac N.T. Howard P. Rodriguez-Fernandez L. Aucone G.D. Conway T. Happel C. Holland P. Mantica J. Schellpfeffer C. Yoo A.E. White the EUROfusion WPTE Team the ASDEX Upgrade Team |
| author_sort | R. Bielajew |
| collection | DOAJ |
| description | In this work, gyrokinetic simulations are performed with the CGYRO code (Candy et al 2016 J. Comput. Phys. 324 73–93) for a negative triangularity H-mode plasma in ASDEX Upgrade, and compared with experimental measurements. The PORTALS framework (Rodriguez-Fernandez et al 2024 Nucl. Fusion 64 076034) is used to accelerate the prediction of kinetic profiles for this plasma, using surrogate modeling and Bayesian optimization. Ion heat flux, electron heat flux, and electron particle flux are simultaneously matched across the simulated radial regime of the plasma (normalized radius $r/a = 0.35-0.90$ ), and the resulting ion temperature, electron temperature, and electron density profiles match well with the experimental profile data within this radial range. A synthetic Correlation Electron Cyclotron Emission diagnostic is applied to find well-matched electron temperature fluctuation properties between simulation and experiment. The flux-matched profiles provide a basis for investigation of the turbulence nature across the plasma radius, revealing the dominance of Trapped Electron Mode turbulence at $r/a = 0.35$ , the dominance of Ion Temperature Gradient turbulence at $r/a = 0.55$ , 0.75, and 0.83, and an instability boundary at $r/a = 0.90$ . |
| format | Article |
| id | doaj-art-a1690f7999624e8f9ef82966686e1f47 |
| institution | DOAJ |
| issn | 0029-5515 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | IOP Publishing |
| record_format | Article |
| series | Nuclear Fusion |
| spelling | doaj-art-a1690f7999624e8f9ef82966686e1f472025-08-20T03:09:01ZengIOP PublishingNuclear Fusion0029-55152025-01-0165808604210.1088/1741-4326/adef68Gyrokinetic profile prediction and validation of a negative triangularity plasma in ASDEX UpgradeR. Bielajew0https://orcid.org/0000-0002-9578-368XB. Vanovac1https://orcid.org/0000-0003-4031-9318N.T. Howard2https://orcid.org/0000-0002-8787-6309P. Rodriguez-Fernandez3https://orcid.org/0000-0002-7361-1131L. Aucone4G.D. Conway5https://orcid.org/0000-0002-3947-4268T. Happel6https://orcid.org/0000-0003-4364-9363C. Holland7https://orcid.org/0000-0001-6029-2306P. Mantica8https://orcid.org/0000-0001-5939-5244J. Schellpfeffer9https://orcid.org/0000-0002-8687-4475C. Yoo10A.E. White11the EUROfusion WPTE Teamthe ASDEX Upgrade TeamPlasma Science and Fusion Center, Massachusetts Institute of Technology , Cambridge, MA, United States of AmericaPlasma Science and Fusion Center, Massachusetts Institute of Technology , Cambridge, MA, United States of AmericaPlasma Science and Fusion Center, Massachusetts Institute of Technology , Cambridge, MA, United States of AmericaPlasma Science and Fusion Center, Massachusetts Institute of Technology , Cambridge, MA, United States of AmericaDepartment of Physics ‘G. Occhialini’, University of Milano-Bicocca , Milano, ItalyMax Planck Institute for Plasma Physics , Garching, GermanyMax Planck Institute for Plasma Physics , Garching, GermanyUniversity of California , San Diago, CA, United States of AmericaIstituto per la Scienza e Tecnologia dei Plasmi , CNR, Milano, ItalyPlasma Science and Fusion Center, Massachusetts Institute of Technology , Cambridge, MA, United States of AmericaPlasma Science and Fusion Center, Massachusetts Institute of Technology , Cambridge, MA, United States of AmericaPlasma Science and Fusion Center, Massachusetts Institute of Technology , Cambridge, MA, United States of AmericaIn this work, gyrokinetic simulations are performed with the CGYRO code (Candy et al 2016 J. Comput. Phys. 324 73–93) for a negative triangularity H-mode plasma in ASDEX Upgrade, and compared with experimental measurements. The PORTALS framework (Rodriguez-Fernandez et al 2024 Nucl. Fusion 64 076034) is used to accelerate the prediction of kinetic profiles for this plasma, using surrogate modeling and Bayesian optimization. Ion heat flux, electron heat flux, and electron particle flux are simultaneously matched across the simulated radial regime of the plasma (normalized radius $r/a = 0.35-0.90$ ), and the resulting ion temperature, electron temperature, and electron density profiles match well with the experimental profile data within this radial range. A synthetic Correlation Electron Cyclotron Emission diagnostic is applied to find well-matched electron temperature fluctuation properties between simulation and experiment. The flux-matched profiles provide a basis for investigation of the turbulence nature across the plasma radius, revealing the dominance of Trapped Electron Mode turbulence at $r/a = 0.35$ , the dominance of Ion Temperature Gradient turbulence at $r/a = 0.55$ , 0.75, and 0.83, and an instability boundary at $r/a = 0.90$ .https://doi.org/10.1088/1741-4326/adef68gyrokinetic simulationturbulencetransportsynthetic diagnosticsnegative triangularity |
| spellingShingle | R. Bielajew B. Vanovac N.T. Howard P. Rodriguez-Fernandez L. Aucone G.D. Conway T. Happel C. Holland P. Mantica J. Schellpfeffer C. Yoo A.E. White the EUROfusion WPTE Team the ASDEX Upgrade Team Gyrokinetic profile prediction and validation of a negative triangularity plasma in ASDEX Upgrade Nuclear Fusion gyrokinetic simulation turbulence transport synthetic diagnostics negative triangularity |
| title | Gyrokinetic profile prediction and validation of a negative triangularity plasma in ASDEX Upgrade |
| title_full | Gyrokinetic profile prediction and validation of a negative triangularity plasma in ASDEX Upgrade |
| title_fullStr | Gyrokinetic profile prediction and validation of a negative triangularity plasma in ASDEX Upgrade |
| title_full_unstemmed | Gyrokinetic profile prediction and validation of a negative triangularity plasma in ASDEX Upgrade |
| title_short | Gyrokinetic profile prediction and validation of a negative triangularity plasma in ASDEX Upgrade |
| title_sort | gyrokinetic profile prediction and validation of a negative triangularity plasma in asdex upgrade |
| topic | gyrokinetic simulation turbulence transport synthetic diagnostics negative triangularity |
| url | https://doi.org/10.1088/1741-4326/adef68 |
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