A novel measurement of marginal Alfvén eigenmode stability during high power auxiliary heating in JET
Abstract
The interaction of Alfvén eigenmodes (AEs) and energetic particles is one of many important factors determining the success of future tokamaks. In JET, eight in-vessel antennas were installed to actively probe stable AEs with frequencies ranging 25–250 kHz and toroidal mode numbers |n| < 20. During the 2019–2020 deuterium campaign, almost 7500 resonances and their frequencies f0, net damping rates γ < 0, and toroidal mode numbers were measured in almost 800 plasma discharges. From a statistical analysis of this database, continuum and radiative damping are inferred to increase with edge safety factor, edge magnetic shear, and when including non-ideal effects. Both stable AE observations and their associated damping rates are found to decrease with |n|. Active antenna excitation is also found to be ineffective in H-mode as opposed to L-mode; this is likely due to the increased edge density gradient’s effect on accessibility and ELM-related noise’s impact on mode identification. A novel measurement is reported of a marginally stable, edge-localized ellipticity-induced AE probed by the antennas during high-power auxiliary heating (ion cyclotron resonance heating and neutral beam injection) up to 25 MW. NOVA-K kinetic-MHD simulations show good agreement with experimental measurements of f0, γ, and n, indicating the dominance of continuummore »
- Authors:
-
[1];
[5];
[6];
[3];
[7];
[9];
[7];
[2];
- Massachusetts Institute of Technology (MIT), Cambridge, MA (United States)
- Culham Science Centre, Abingdon (United Kingdom)
- Ecole Polytechnique Federale Lausanne (EPFL (Switzerland)
- Ecole Superieure de Physique et de Chimie Industrielles de la Ville de Paris (France)
- Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
- CEA Institute for Magnetic Fusion Research (IRFM), Saint-Paul-lez-Durance (France)
- Laboratory for Plasma Physics, Brussels (Belgium)
- University of Lisbon (Portugal)
- University of Milan-Bicocca (Italy); National Research Council, Milan (Italy)
- Jozef Stefan Inst. (IJS), Ljubljana (Slovenia)
- Publication Date:
- Research Org.:
- Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States)
- Sponsoring Org.:
- USDOE; FAPESP Project; Euratom Research and Training
- Contributing Org.:
- Jet Contributors
- OSTI Identifier:
- 1873491
- Grant/Contract Number:
- AC02-09CH11466; SC0014264; 2011/50773-0; 633053
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Nuclear Fusion
- Additional Journal Information:
- Journal Volume: 62; Journal Issue: 7; Journal ID: ISSN 0029-5515
- Publisher:
- IOP Science
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 70 PLASMA PHYSICS AND FUSION TECHNOLOGY; Alfven eigenmode; stability; neutral beam injection; ion cyclotron resonance heating
Citation Formats
Tinguely, R. A., Fil, N., Puglia, P. G., Dowson, S., Porkolab, M., Guillemot, V., Podestà, M., Baruzzo, M., Dumont, R., Fasoli, A., Fitzgerald, M., Kazakov, Ye O., Nave, M. F.F., Nocente, M., Ongena, J., Sharapov, S. E., and Štancar, Ž. A novel measurement of marginal Alfvén eigenmode stability during high power auxiliary heating in JET. United States: N. p., 2022.
Web. doi:10.1088/1741-4326/ac3c84.
Tinguely, R. A., Fil, N., Puglia, P. G., Dowson, S., Porkolab, M., Guillemot, V., Podestà, M., Baruzzo, M., Dumont, R., Fasoli, A., Fitzgerald, M., Kazakov, Ye O., Nave, M. F.F., Nocente, M., Ongena, J., Sharapov, S. E., & Štancar, Ž. A novel measurement of marginal Alfvén eigenmode stability during high power auxiliary heating in JET. United States. https://doi.org/10.1088/1741-4326/ac3c84
Tinguely, R. A., Fil, N., Puglia, P. G., Dowson, S., Porkolab, M., Guillemot, V., Podestà, M., Baruzzo, M., Dumont, R., Fasoli, A., Fitzgerald, M., Kazakov, Ye O., Nave, M. F.F., Nocente, M., Ongena, J., Sharapov, S. E., and Štancar, Ž. Fri .
"A novel measurement of marginal Alfvén eigenmode stability during high power auxiliary heating in JET". United States. https://doi.org/10.1088/1741-4326/ac3c84. https://www.osti.gov/servlets/purl/1873491.
@article{osti_1873491,
title = {A novel measurement of marginal Alfvén eigenmode stability during high power auxiliary heating in JET},
author = {Tinguely, R. A. and Fil, N. and Puglia, P. G. and Dowson, S. and Porkolab, M. and Guillemot, V. and Podestà, M. and Baruzzo, M. and Dumont, R. and Fasoli, A. and Fitzgerald, M. and Kazakov, Ye O. and Nave, M. F.F. and Nocente, M. and Ongena, J. and Sharapov, S. E. and Štancar, Ž.},
abstractNote = {The interaction of Alfvén eigenmodes (AEs) and energetic particles is one of many important factors determining the success of future tokamaks. In JET, eight in-vessel antennas were installed to actively probe stable AEs with frequencies ranging 25–250 kHz and toroidal mode numbers |n| < 20. During the 2019–2020 deuterium campaign, almost 7500 resonances and their frequencies f0, net damping rates γ < 0, and toroidal mode numbers were measured in almost 800 plasma discharges. From a statistical analysis of this database, continuum and radiative damping are inferred to increase with edge safety factor, edge magnetic shear, and when including non-ideal effects. Both stable AE observations and their associated damping rates are found to decrease with |n|. Active antenna excitation is also found to be ineffective in H-mode as opposed to L-mode; this is likely due to the increased edge density gradient’s effect on accessibility and ELM-related noise’s impact on mode identification. A novel measurement is reported of a marginally stable, edge-localized ellipticity-induced AE probed by the antennas during high-power auxiliary heating (ion cyclotron resonance heating and neutral beam injection) up to 25 MW. NOVA-K kinetic-MHD simulations show good agreement with experimental measurements of f0, γ, and n, indicating the dominance of continuum and electron Landau damping in this case. Similar experimental and computational studies are planned for the recent hydrogen and ongoing tritium campaigns, in preparation for the upcoming DT campaign.},
doi = {10.1088/1741-4326/ac3c84},
journal = {Nuclear Fusion},
number = 7,
volume = 62,
place = {United States},
year = {Fri Apr 22 00:00:00 EDT 2022},
month = {Fri Apr 22 00:00:00 EDT 2022}
}
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