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

Abstract

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

Authors:

Teplukhina, A. A. ;

• Search DOE PAGES for author "Teplukhina, A. A."
• Search DOE PAGES for ORCID "0000-0002-9213-7594"

Podestà, M. ;

• Search DOE PAGES for author "Podestà, M."
• Search DOE PAGES for ORCID "0000-0003-4975-0585"

Poli, F. M. ;

• Search DOE PAGES for author "Poli, F. M."
• Search DOE PAGES for ORCID "0000-0003-3959-4371"

Gorelenkova, M. ;

• Search DOE PAGES for author "Gorelenkova, M."
• Search DOE PAGES for ORCID "0000-0001-8487-1396"

Bonofiglo, P. J. ;

• Search DOE PAGES for author "Bonofiglo, P. J."
• Search DOE PAGES for ORCID "0000-0001-5057-7383"

Collins, C. S.; Dumont, R. J. ;

• Search DOE PAGES for author "Dumont, R. J."
• Search DOE PAGES for ORCID "0000-0002-1030-138X"

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

Publication Date:

Thu Feb 16 00:00:00 EST 2023

Research Org.:

Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States)

Sponsoring Org.:

USDOE; European Union (EU)

Contributing Org.:

JET Contributors

OSTI Identifier:

1926733

Alternate Identifier(s):

OSTI ID: 1923105; OSTI ID: 1957523

Grant/Contract Number:  

AC02-09CH11466; 101052200

Resource Type:

Published Article

Journal Name:

Plasma Physics and Controlled Fusion

Additional Journal Information:

Journal Name: Plasma Physics and Controlled Fusion Journal Volume: 65 Journal Issue: 3; Journal ID: ISSN 0741-3335

Publisher:

IOP Publishing

Country of Publication:

United Kingdom

Language:

English

Subject:

70 PLASMA PHYSICS AND FUSION TECHNOLOGY; fast ion transport; Alfvén Eigenmode instability; scenario optimisation; integrated modelling