Alfvén eigenmode stability in a JET afterglow deuterium plasma and projections to deuterium–tritium plasmas

Teplukhina, A. A.; Podestà, M.; Poli, F. M.; Gorelenkova, M.; Bonofiglo, P. J.; Collins, C. S.; Dumont, R. J.; Hawkes, N. C.; Keeling, D. L.; Sertoli, M.; Szepesi, G.; Thorman, A.; Contributors, JET

doi:10.1088/1361-6587/acb844

Alfvén eigenmode stability in a JET afterglow deuterium plasma and projections to deuterium–tritium plasmas

Journal Article · Thu Feb 16 00:00:00 EST 2023 · Plasma Physics and Controlled Fusion

DOI:https://doi.org/10.1088/1361-6587/acb844· OSTI ID:1926733

; ; ; ; ; Collins, C. S.; ; Hawkes, N. C.; Keeling, D. L.; Sertoli, M.; Szepesi, G.; Thorman, A.; Contributors, JET

Abstract

The performance of fusion devices relies strongly on the good confinement of energetic particles (EPs). Therefore, the investigation of EP transport by magnetohydrodynamic instabilities is one of the key aspects in the development of plasma scenarios. Alfvénic instabilities in particular can lead to significant losses of alpha particles that are essential for plasma self-heating. A so-called afterglow scheme has been developed to study the destabilization of Alfvén eigenmodes (AEs) by alpha particles and associated EP transport in the JET tokamak. In this work, the linear stability of AEs is discussed for the partial afterglow phase in a JET deuterium plasma discharge and for the full afterglow phase in a projected deuterium–tritium (DT) plasma. Thanks to recent upgrades in the tokamak transport code TRANSP, one can account for the contributions of different EP species to mode stability. Analysis of deuterium plasmas shows that AE growth rates are extremely sensitive to the energy and distribution of fast ions. An increase in fast ion energy can lead to more unstable AEs. In the afterglow phase of projected DT plasmas, it is EPs that mostly drive the AEs. However, the drive by alpha particles is comparable to that by beam ions and their contribution to the net growth rate might be hard to separate. According to the discussed projections, the destabilization of AEs might be ineffective because the background plasma damping significantly exceeds the EP drive. In this case, the development of an alternative plasma scenario that allows us to overcome such damping would be required in future experiments.

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Research Organization:: Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States)

Sponsoring Organization:: European Union (EU); USDOE

Contributing Organization:: JET Contributors

Grant/Contract Number:: AC02-09CH11466

OSTI ID:: 1926733

Alternate ID(s):: OSTI ID: 1923105
OSTI ID: 1957523

Journal Information:: Plasma Physics and Controlled Fusion, Journal Name: Plasma Physics and Controlled Fusion Journal Issue: 3 Vol. 65; ISSN 0741-3335

Publisher:: IOP PublishingCopyright Statement

Country of Publication:: United Kingdom

Language:: English

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