Prof Michael Barnes: Publications

Measuring the beamlet divergence in NBI systems for fusion: A diagnostic comparison

Fusion Engineering and Design Elsevier 215 (2025) 114951

Authors:

Niek den Harder, Michael Barnes, Andreas Döring, Bernd Heinemann, Bruno Laterza, Isabella Mario, Antonio Pimazzoni, Carlo Poggi, Alessandro La Rosa, Emanuele Sartori, Beatrice Segalini, Gianluigi Serianni, Alastair Shepherd, Christian Wimmer, Dirk Wünderlich, Ursel Fantz

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Measurement of Zero-Frequency Fluctuations Generated by Coupling between Alfvén Modes in the JET Tokamak.

Physical review letters American Physical Society (APS) 134:9 (2025) 95103

Authors:

J Ruiz Ruiz, J Garcia, M Barnes, M Dreval, C Giroud, Vh Hall-Chen, Mr Hardman, Jc Hillesheim, Y Kazakov, S Mazzi, Bs Patel, Fi Parra, Aa Schekochihin, Ž Štancar, JET Contributors and the EUROfusion Tokamak Exploitation Team

Abstract:

We report the first experimental detection of a zero-frequency fluctuation that is pumped by an Alfvén mode in a magnetically confined plasma. Core-localized Alfvén modes of frequency inside the toroidicity-induced gap (and its harmonics) exhibit three-wave coupling interactions with a zero-frequency fluctuation. The observation of the zero-frequency fluctuation is consistent with theoretical and numerical predictions of zonal modes pumped by Alfvén modes, and is correlated with an increase in the deep core ion temperature, temperature gradient, confinement factor H_{89,P}, and a reduction in the main ion heat diffusivity. Despite the energetic particle transport induced by the Alfvén eigenmodes, the generation of a zero-frequency fluctuation that can suppress the turbulence leads to an overall improvement of confinement.

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Insights into stripping losses of negative ions in an ITER-like pre-acceleration system

Plasma Physics and Controlled Fusion IOP Publishing 67:1 (2025) 015011

Authors:

A Navarro, M Barnes, N den Harder, D Wünderlich, U Fantz

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Influence of the density gradient on turbulent heat transport at ion-scales: an inter-machine study with the gyrokinetic code stella

Nuclear Fusion IOP Publishing 65:1 (2025) 016062

Authors:

H Thienpondt, JM García-Regaña, I Calvo, G Acton, M Barnes

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Density profiles in stellarators: an overview of particle transport, fuelling and profile shaping studies at TJ-II

Nuclear Fusion IOP Publishing 64:11 (2024) 112018

Authors:

JA Alonso, D Alegre, J Alonso, R Antón, A Arias-Camisón, E Ascasíbar, A Baciero, JM Barcala, M Barnes, E Blanco, L Bueno, A Bustos, S Cabrera, E de la Cal, I Calvo, A Cappa, D Carralero, R Carrasco, B Carreras, R Castro, A de Castro, L Cebrián, M Chamorro, AA Chmyga, P Colino, J Duque, FJ Escoto, T Estrada, A Fernández, J Fraguas, JM Fontdecaba, A Gabriel, L García, I García-Cortés, R García-Gómez, JM García-Regaña, G Godino-Sedano, J Gómez-Manchón, A González, A González-Jerez, V Guisse, J Hernández-Sánchez, J Hernanz, C Hidalgo, P Ivanova, A Jiménez-Denche, D Jiménez-Rey, G Kocsis, M Koepke, AS Kozachek, F Lapayese, M Liniers, D López, D López-Bruna, B López-Miranda, E de la Luna, E Maragkoudakis, F Martín-Díaz, G Martín-Gómez, J Martínez-Fernández, KJ McCarthy, F Medina, D Medina-Roque, M Medrano, P Méndez, FJ Miguel, B van Milligen, A Molinero, G Motojima, S Mulas, M Navarro, I Nedzelskiy, R Nuñez, M Ochando, E Oyarzábal, JL de Pablos, F Palomares, N Panadero, FI Parra, C Pastor, I Pastor, A de la Peña, R Peralta, A Pereira, P Pons-Villalonga, AB Portas, E Poveda, FJ Ramos, GA Rattá, M Redondo, C Reynoso, E Rincón, J de la Riva, C Rodríguez-Fernández, A Ros, E Sánchez, J Sánchez, E Sánchez-Sarabia, JA Sebastián, ER Solano, A Soleto, T Szepesi, FL Tabarés, D Tafalla, H Takahashi, N Tamura, H Thienpondt, A Tolkachev, V Tribaldos, R Unamuno, J Varela, J Vega, JL Velasco, I Voldiner

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Prof Michael Barnes

Sub department

Measuring the beamlet divergence in NBI systems for fusion: A diagnostic comparison

Authors:

Measurement of Zero-Frequency Fluctuations Generated by Coupling between Alfvén Modes in the JET Tokamak.

Authors:

Abstract:

Insights into stripping losses of negative ions in an ITER-like pre-acceleration system

Authors:

Influence of the density gradient on turbulent heat transport at ion-scales: an inter-machine study with the gyrokinetic code stella

Authors:

Density profiles in stellarators: an overview of particle transport, fuelling and profile shaping studies at TJ-II

Authors:

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Prof Michael Barnes

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Measuring the beamlet divergence in NBI systems for fusion: A diagnostic comparison

Authors:

Measurement of Zero-Frequency Fluctuations Generated by Coupling between Alfvén Modes in the JET Tokamak.

Authors:

Abstract:

Insights into stripping losses of negative ions in an ITER-like pre-acceleration system

Authors:

Influence of the density gradient on turbulent heat transport at ion-scales: an inter-machine study with the gyrokinetic code stella

Authors:

Density profiles in stellarators: an overview of particle transport, fuelling and profile shaping studies at TJ-II

Authors: