Nuclear Fusion (Jan 2023)
Stability analysis of alpha driven toroidal Alfvén eigenmodes observed in JET deuterium-tritium internal transport barrier plasmas
- M. Fitzgerald,
- R. Dumont,
- D. Keeling,
- J. Mailloux,
- S. Sharapov,
- M. Dreval,
- A. Figueiredo,
- R. Coelho,
- J. Ferreira,
- P. Rodrigues,
- F. Nabais,
- D. Borba,
- Ž. Štancar,
- G. Szepesi,
- R.A. Tinguely,
- P.G. Puglia,
- H.J.C. Oliver,
- V. Kiptily,
- M. Baruzzo,
- M. Lennholm,
- P. Siren,
- J. Garcia,
- C.F. Maggi,
- JET Contributors
Affiliations
- M. Fitzgerald
- United Kingdom Atomic Energy Authority, Culham Science Centre , Abingdon, Oxon OX14 3DB, United Kingdom of Great Britain and Northern Ireland
- R. Dumont
- ORCiD
- CEA, IRFM , F-13108 Saint Paul Lez Durance, France
- D. Keeling
- United Kingdom Atomic Energy Authority, Culham Science Centre , Abingdon, Oxon OX14 3DB, United Kingdom of Great Britain and Northern Ireland
- J. Mailloux
- United Kingdom Atomic Energy Authority, Culham Science Centre , Abingdon, Oxon OX14 3DB, United Kingdom of Great Britain and Northern Ireland
- S. Sharapov
- ORCiD
- United Kingdom Atomic Energy Authority, Culham Science Centre , Abingdon, Oxon OX14 3DB, United Kingdom of Great Britain and Northern Ireland
- M. Dreval
- ORCiD
- National Science Center ‘Kharkov Institute of Physics and Technology’ , Akademichna 1, Kharkiv 61108, Ukraine
- A. Figueiredo
- ORCiD
- Instituto de Plasmas e Fusão Nuclear, Instituto Superior Técnico, Universidade de Lisboa , 1049-001 Lisboa, Portugal
- R. Coelho
- Instituto de Plasmas e Fusão Nuclear, Instituto Superior Técnico, Universidade de Lisboa , 1049-001 Lisboa, Portugal
- J. Ferreira
- Instituto de Plasmas e Fusão Nuclear, Instituto Superior Técnico, Universidade de Lisboa , 1049-001 Lisboa, Portugal
- P. Rodrigues
- ORCiD
- Instituto de Plasmas e Fusão Nuclear, Instituto Superior Técnico, Universidade de Lisboa , 1049-001 Lisboa, Portugal
- F. Nabais
- ORCiD
- Instituto de Plasmas e Fusão Nuclear, Instituto Superior Técnico, Universidade de Lisboa , 1049-001 Lisboa, Portugal
- D. Borba
- Instituto de Plasmas e Fusão Nuclear, Instituto Superior Técnico, Universidade de Lisboa , 1049-001 Lisboa, Portugal
- Ž. Štancar
- ORCiD
- United Kingdom Atomic Energy Authority, Culham Science Centre , Abingdon, Oxon OX14 3DB, United Kingdom of Great Britain and Northern Ireland
- G. Szepesi
- United Kingdom Atomic Energy Authority, Culham Science Centre , Abingdon, Oxon OX14 3DB, United Kingdom of Great Britain and Northern Ireland
- R.A. Tinguely
- ORCiD
- MIT Plasma Science and Fusion Center , Cambridge, MA 02139, United States of America
- P.G. Puglia
- Ecole Polytechnique Fédérale de Lausanne (EPFL), Swiss Plasma Center (SPC) , CH-1015 Lausanne, Switzerland
- H.J.C. Oliver
- ORCiD
- United Kingdom Atomic Energy Authority, Culham Science Centre , Abingdon, Oxon OX14 3DB, United Kingdom of Great Britain and Northern Ireland
- V. Kiptily
- ORCiD
- United Kingdom Atomic Energy Authority, Culham Science Centre , Abingdon, Oxon OX14 3DB, United Kingdom of Great Britain and Northern Ireland
- M. Baruzzo
- Dip.to Fusione e Tecnologie per la Sicurezza Nucleare , ENEA C. R. Frascati, via E. Fermi 45, 00044 Frascati (Roma), Italy
- M. Lennholm
- United Kingdom Atomic Energy Authority, Culham Science Centre , Abingdon, Oxon OX14 3DB, United Kingdom of Great Britain and Northern Ireland
- P. Siren
- United Kingdom Atomic Energy Authority, Culham Science Centre , Abingdon, Oxon OX14 3DB, United Kingdom of Great Britain and Northern Ireland
- J. Garcia
- ORCiD
- CEA, IRFM , F-13108 Saint Paul Lez Durance, France
- C.F. Maggi
- ORCiD
- United Kingdom Atomic Energy Authority, Culham Science Centre , Abingdon, Oxon OX14 3DB, United Kingdom of Great Britain and Northern Ireland
- JET Contributors
- DOI
- https://doi.org/10.1088/1741-4326/acee14
- Journal volume & issue
-
Vol. 63,
no. 11
p. 112006
Abstract
A toroidal Alfvén eigenmode (TAE) has been observed to be driven by alpha particles in a JET deuterium-tritium internal transport barrier plasma. The observation occurred 50 ms after the removal of neutral beam heating (NBI). The mode is observed on magnetics, soft-xray, interferometry and reflectometry measurements. We present detailed stability calculations using a similar tool set validated during deuterium only discharges. These calculations strongly support the conclusion that the observed mode is a TAE, and that this mode was destabilized by alpha particles. Non-ideal effects from the bulk plasma are interpreted as responsible for suppressing the majority of TAEs which were also driven by alpha particles, but the modes that match the observations are predicted to be particularly weak for these non-ideal effects. This mode located far from the core on the outboard midplane is found to be driven by both trapped and passing particles despite alpha particles originating in the core.
Keywords
