Journal article
Measurement of zero-frequency fluctuations generated by coupling between Alfvén modes in the JET Tokamak
- Abstract:
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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 H89,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.
- Publication status:
- Published
- Peer review status:
- Peer reviewed
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(Preview, Version of record, pdf, 3.5MB, Terms of use)
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- Publisher copy:
- 10.1103/physrevlett.134.095103
Authors
Contributors
- Role:
- Contributor
- Role:
- Contributor
- Funder identifier:
- https://ror.org/019ya6433
- Publisher:
- American Physical Society
- Journal:
- Physical Review Letters More from this journal
- Volume:
- 134
- Issue:
- 9
- Article number:
- 95103
- Publication date:
- 2025-03-07
- Acceptance date:
- 2024-12-04
- DOI:
- EISSN:
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1079-7114
- ISSN:
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0031-9007
- Pmid:
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40131073
- Language:
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English
- Pubs id:
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2094390
- Local pid:
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pubs:2094390
- Deposit date:
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2025-04-19
- ARK identifier:
Terms of use
- Copyright holder:
- Ruiz Ruiz et al.
- Copyright date:
- 2025
- Rights statement:
- Copyright © 2025 The Author(s). Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI.
- Licence:
- CC Attribution (CC BY)
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