Evidence for Alfvén eigenmodes driven by alpha particles in D-3He fusion experiments on JET

V. G. Kiptily; M. Fitzgerald; YE O. Kazakov; J. Ongena; M. Nocente; S. E. Sharapov; M. Dreval; Štancar; T. Craciunescu; J. Garcia; L. Giacomelli; V. Goloborodko; H. J.C. Oliver; H. Weisen

doi:10.1088/1741-4326/ac26a2

Evidence for Alfvén eigenmodes driven by alpha particles in D-³He fusion experiments on JET

V. G. Kiptily, M. Fitzgerald, YE O. Kazakov, J. Ongena, M. Nocente, S. E. Sharapov, M. Dreval, Štancar, T. Craciunescu, J. Garcia, L. Giacomelli, V. Goloborodko, H. J.C. Oliver, H. Weisen

Laboratory for Plasma Physics

Research output: Contribution to journal › Article › peer-review

Abstract

Alfvén eigenmodes (AEs) driven by energetic alpha particles can lead to enhanced fast ion transport and losses, thereby degrading the plasma performance in ITER and future magnetic confinement fusion reactors. Unexpectedly, AEs with negative toroidal mode numbers, which are currently not considered for ITER, were observed in dedicated experiments with fusion-born alpha particles on the tokamak Joint European Torus (JET). The paper provides evidence for a complex interplay between fast ions, monster sawtooth crashes and AEs. Our results highlight the need for an improved description of the synergies between different fast ion phenomena in future burning plasmas.

Original language	English
Article number	114006
Journal	Nuclear Fusion
Volume	61
Issue number	11
DOIs	https://doi.org/10.1088/1741-4326/ac26a2
Publication status	Published - Nov 2021

Keywords

MHD instabilities
fast-ions
fusion-born alpha-particles
tokamak

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Kiptily, V. G., Fitzgerald, M., Kazakov, YE. O., Ongena, J., Nocente, M., Sharapov, S. E., Dreval, M., Štancar, Craciunescu, T., Garcia, J., Giacomelli, L., Goloborodko, V., Oliver, H. J. C., & Weisen, H. (2021). Evidence for Alfvén eigenmodes driven by alpha particles in D-³He fusion experiments on JET. Nuclear Fusion, 61(11), Article 114006. https://doi.org/10.1088/1741-4326/ac26a2

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title = "Evidence for Alfv{\'e}n eigenmodes driven by alpha particles in D-3He fusion experiments on JET",

abstract = "Alfv{\'e}n eigenmodes (AEs) driven by energetic alpha particles can lead to enhanced fast ion transport and losses, thereby degrading the plasma performance in ITER and future magnetic confinement fusion reactors. Unexpectedly, AEs with negative toroidal mode numbers, which are currently not considered for ITER, were observed in dedicated experiments with fusion-born alpha particles on the tokamak Joint European Torus (JET). The paper provides evidence for a complex interplay between fast ions, monster sawtooth crashes and AEs. Our results highlight the need for an improved description of the synergies between different fast ion phenomena in future burning plasmas.",

keywords = "MHD instabilities, fast-ions, fusion-born alpha-particles, tokamak",

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doi = "10.1088/1741-4326/ac26a2",

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AU - Kiptily, V. G.

AU - Fitzgerald, M.

AU - Kazakov, YE O.

AU - Ongena, J.

AU - Nocente, M.

AU - Sharapov, S. E.

AU - Dreval, M.

AU - Štancar,

AU - Craciunescu, T.

AU - Garcia, J.

AU - Giacomelli, L.

AU - Goloborodko, V.

AU - Oliver, H. J.C.

AU - Weisen, H.

PY - 2021/11

Y1 - 2021/11

N2 - Alfvén eigenmodes (AEs) driven by energetic alpha particles can lead to enhanced fast ion transport and losses, thereby degrading the plasma performance in ITER and future magnetic confinement fusion reactors. Unexpectedly, AEs with negative toroidal mode numbers, which are currently not considered for ITER, were observed in dedicated experiments with fusion-born alpha particles on the tokamak Joint European Torus (JET). The paper provides evidence for a complex interplay between fast ions, monster sawtooth crashes and AEs. Our results highlight the need for an improved description of the synergies between different fast ion phenomena in future burning plasmas.

AB - Alfvén eigenmodes (AEs) driven by energetic alpha particles can lead to enhanced fast ion transport and losses, thereby degrading the plasma performance in ITER and future magnetic confinement fusion reactors. Unexpectedly, AEs with negative toroidal mode numbers, which are currently not considered for ITER, were observed in dedicated experiments with fusion-born alpha particles on the tokamak Joint European Torus (JET). The paper provides evidence for a complex interplay between fast ions, monster sawtooth crashes and AEs. Our results highlight the need for an improved description of the synergies between different fast ion phenomena in future burning plasmas.

KW - MHD instabilities

KW - fast-ions

KW - fusion-born alpha-particles

KW - tokamak

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DO - 10.1088/1741-4326/ac26a2

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VL - 61

JO - Nuclear Fusion

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IS - 11

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ER -

Evidence for Alfvén eigenmodes driven by alpha particles in D-³He fusion experiments on JET

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Keywords

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