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Gyrokinetic analysis of the JET hybrid H-mode pedestal
Max Planck Institute for Plasma Physics, Boltzmannstraße 2, 85748 Garching b. München, Germany; Oden Institute for Computational Engineering and Sciences, The University of Texas at Austin, Texas 78712, USA.
Max Planck Institute for Plasma Physics, Boltzmannstraße 2, 85748 Garching b. München, Germany.
KTH, School of Electrical Engineering and Computer Science (EECS), Electrical Engineering, Electromagnetic Engineering and Fusion Science.ORCID iD: 0000-0002-9546-4494
CCFE, Culham Science Center, Abingdon OX14 3DB, United Kingdom and Northern Ireland.
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2025 (English)In: Physics of Plasmas, ISSN 1070-664X, E-ISSN 1089-7674, Vol. 32, no 10, article id 102508Article in journal (Refereed) Published
Abstract [en]

Turbulent transport is a decisive factor in determining the pedestal structure of H-modes. Here, we present the first comprehensive characterization of gyrokinetic turbulent transport in a JET hybrid H-mode pedestal. Local, linear simulations are performed to identify instabilities and global, nonlinear electromagnetic simulations reveal the turbulent heat and particle flux structure of the pedestal. Our analysis focuses on the Deuterium reference discharge #97781 performed in the scenario development for the Deuterium-Tritium campaign. We find the pedestal top transport to be dominated by ion temperature gradient (ITG) modes. In the pedestal center turbulent ion transport is suppressed and electron transport is driven by multi-faceted electron temperature gradient (ETG) modes, which extend down to ion-gyroradius scales. E × B shear is observed to strongly reduce the absolute turbulence level in global, nonlinear simulations. Furthermore, impurities are shown to reduce the main ion transport. Dedicated density and ion temperature profile variations test the sensitivity of the results and do not find strong differences in the turbulent transport in more reactor-like conditions.

Place, publisher, year, edition, pages
AIP Publishing , 2025. Vol. 32, no 10, article id 102508
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Fusion, Plasma and Space Physics
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URN: urn:nbn:se:kth:diva-372483DOI: 10.1063/5.0282014ISI: 001598073800001Scopus ID: 2-s2.0-105018921870OAI: oai:DiVA.org:kth-372483DiVA, id: diva2:2012284
Note

QC 20251107

Available from: 2025-11-07 Created: 2025-11-07 Last updated: 2025-11-07Bibliographically approved

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Frassinetti, Lorenzo

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