Dynamics of the fast-ion acceleration in type-I ELMy H-mode scenarios on the TCV tokamak.
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| Title: | Dynamics of the fast-ion acceleration in type-I ELMy H-mode scenarios on the TCV tokamak. |
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| Authors: | Poley-Sanjuán, J.1 (AUTHOR) jesus.poley@epfl.ch, Jansen Van Vuuren, A.1 (AUTHOR), Galdón-Quiroga, J.2 (AUTHOR), Mazzi, S.3 (AUTHOR), Podestá, M.1 (AUTHOR), Dreval, M.B.4 (AUTHOR), Duval, B.P.1 (AUTHOR), Fasoli, A.1 (AUTHOR), Karpushov, A.N.1 (AUTHOR), Labit, B.1 (AUTHOR) |
| Source: | Nuclear Fusion. 2026, Vol. 66 Issue 3, p1-12. 12p. |
| Subjects: | Particle acceleration, H-mode plasma confinement, Plasma Alfven waves, Plasma dynamics, Tokamaks, Plasma waves, Magnetohydrodynamics, Detectors |
| Abstract: | Fast ions have been observed to be accelerated in the presence of Edge Localised Modes (ELMs) and MHD activity on the Tokamak á Configuration Variable. The acceleration time, velocity-space and frequency dynamics have been resolved by analysing the fast-ion losses measured using a unique Fast Ion Loss Detector (FILD) that allows microsecond velocity-space mapping. The findings presented herein complement and extend previous studies done at the Asdex Upgrade Tokamak and show a decorrelation between the acceleration and the ELM crash. The experimental scenario is a high-confinement mode (H-mode) plasma, characterised by low density, high electron temperature and, hence, long slowing down times of the fast-ion population. Significant MHD activity has been observed in the inter-ELM-crash period with frequencies ranging from 50 to 250 kHz. These modes exhibit strong down-chirping and burst signatures. The empirical dependence of the modes' frequency upon the plasma density identifies them as Alfvén Eigenmodes (AEs) and locates them in the outer region of the plasma, where the resonance conditions between the fast ions and modes are fulfilled. Their resonant interaction with the fast-ion, generated using a Neutral Beam Injector, changes during the ELM cycle according to the changes in the plasma parameters, such as density and temperature. The fast-ion losses are also identified using orbit following simulations, allowing us to distinguish the different contributions to the FILD signal. The pre-ELM AEs' frequencies and the velocity-space of the MHD-induced fast-ion losses are preserved on the FILD signal during the first ∼800 microseconds of the ELM crash, suggesting a complex interaction between AEs, fast ions and ELMs. [ABSTRACT FROM AUTHOR] |
| Copyright of Nuclear Fusion is the property of IOP Publishing and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) | |
| Database: | Engineering Source |
| FullText | Text: Availability: 0 |
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| Header | DbId: egs DbLabel: Engineering Source An: 191357663 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
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| Items | – Name: Title Label: Title Group: Ti Data: Dynamics of the fast-ion acceleration in type-I ELMy H-mode scenarios on the TCV tokamak. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Poley-Sanjuán%2C+J%2E%22">Poley-Sanjuán, J.</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> jesus.poley@epfl.ch</i><br /><searchLink fieldCode="AR" term="%22Jansen+Van+Vuuren%2C+A%2E%22">Jansen Van Vuuren, A.</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Galdón-Quiroga%2C+J%2E%22">Galdón-Quiroga, J.</searchLink><relatesTo>2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Mazzi%2C+S%2E%22">Mazzi, S.</searchLink><relatesTo>3</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Podestá%2C+M%2E%22">Podestá, M.</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Dreval%2C+M%2EB%2E%22">Dreval, M.B.</searchLink><relatesTo>4</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Duval%2C+B%2EP%2E%22">Duval, B.P.</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Fasoli%2C+A%2E%22">Fasoli, A.</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Karpushov%2C+A%2EN%2E%22">Karpushov, A.N.</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Labit%2C+B%2E%22">Labit, B.</searchLink><relatesTo>1</relatesTo> (AUTHOR) – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22Nuclear+Fusion%22">Nuclear Fusion</searchLink>. 2026, Vol. 66 Issue 3, p1-12. 12p. – Name: Subject Label: Subjects Group: Su Data: <searchLink fieldCode="DE" term="%22Particle+acceleration%22">Particle acceleration</searchLink><br /><searchLink fieldCode="DE" term="%22H-mode+plasma+confinement%22">H-mode plasma confinement</searchLink><br /><searchLink fieldCode="DE" term="%22Plasma+Alfven+waves%22">Plasma Alfven waves</searchLink><br /><searchLink fieldCode="DE" term="%22Plasma+dynamics%22">Plasma dynamics</searchLink><br /><searchLink fieldCode="DE" term="%22Tokamaks%22">Tokamaks</searchLink><br /><searchLink fieldCode="DE" term="%22Plasma+waves%22">Plasma waves</searchLink><br /><searchLink fieldCode="DE" term="%22Magnetohydrodynamics%22">Magnetohydrodynamics</searchLink><br /><searchLink fieldCode="DE" term="%22Detectors%22">Detectors</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: Fast ions have been observed to be accelerated in the presence of Edge Localised Modes (ELMs) and MHD activity on the Tokamak á Configuration Variable. The acceleration time, velocity-space and frequency dynamics have been resolved by analysing the fast-ion losses measured using a unique Fast Ion Loss Detector (FILD) that allows microsecond velocity-space mapping. The findings presented herein complement and extend previous studies done at the Asdex Upgrade Tokamak and show a decorrelation between the acceleration and the ELM crash. The experimental scenario is a high-confinement mode (H-mode) plasma, characterised by low density, high electron temperature and, hence, long slowing down times of the fast-ion population. Significant MHD activity has been observed in the inter-ELM-crash period with frequencies ranging from 50 to 250 kHz. These modes exhibit strong down-chirping and burst signatures. The empirical dependence of the modes' frequency upon the plasma density identifies them as Alfvén Eigenmodes (AEs) and locates them in the outer region of the plasma, where the resonance conditions between the fast ions and modes are fulfilled. Their resonant interaction with the fast-ion, generated using a Neutral Beam Injector, changes during the ELM cycle according to the changes in the plasma parameters, such as density and temperature. The fast-ion losses are also identified using orbit following simulations, allowing us to distinguish the different contributions to the FILD signal. The pre-ELM AEs' frequencies and the velocity-space of the MHD-induced fast-ion losses are preserved on the FILD signal during the first ∼800 microseconds of the ELM crash, suggesting a complex interaction between AEs, fast ions and ELMs. [ABSTRACT FROM AUTHOR] – Name: AbstractSuppliedCopyright Label: Group: Ab Data: <i>Copyright of Nuclear Fusion is the property of IOP Publishing and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.) |
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| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.1088/1741-4326/ae3a66 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 12 StartPage: 1 Subjects: – SubjectFull: Particle acceleration Type: general – SubjectFull: H-mode plasma confinement Type: general – SubjectFull: Plasma Alfven waves Type: general – SubjectFull: Plasma dynamics Type: general – SubjectFull: Tokamaks Type: general – SubjectFull: Plasma waves Type: general – SubjectFull: Magnetohydrodynamics Type: general – SubjectFull: Detectors Type: general Titles: – TitleFull: Dynamics of the fast-ion acceleration in type-I ELMy H-mode scenarios on the TCV tokamak. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Poley-Sanjuán, J. – PersonEntity: Name: NameFull: Jansen Van Vuuren, A. – PersonEntity: Name: NameFull: Galdón-Quiroga, J. – PersonEntity: Name: NameFull: Mazzi, S. – PersonEntity: Name: NameFull: Podestá, M. – PersonEntity: Name: NameFull: Dreval, M.B. – PersonEntity: Name: NameFull: Duval, B.P. – PersonEntity: Name: NameFull: Fasoli, A. – PersonEntity: Name: NameFull: Karpushov, A.N. – PersonEntity: Name: NameFull: Labit, B. IsPartOfRelationships: – BibEntity: Dates: – D: 01 M: 03 Text: 2026 Type: published Y: 2026 Identifiers: – Type: issn-print Value: 00295515 Numbering: – Type: volume Value: 66 – Type: issue Value: 3 Titles: – TitleFull: Nuclear Fusion Type: main |
| ResultId | 1 |
