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Stability analysis of alpha driven toroidal Alfvén eigenmodes observed in JET deuterium-tritium internal transport barrier plasmas
- Source :
- Nuclear Fusion, Vol 63, Iss 11, p 112006 (2023)
- Publication Year :
- 2023
- Publisher :
- IOP Publishing, 2023.
-
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.
Details
- Language :
- English
- ISSN :
- 17414326 and 00295515
- Volume :
- 63
- Issue :
- 11
- Database :
- Directory of Open Access Journals
- Journal :
- Nuclear Fusion
- Publication Type :
- Academic Journal
- Accession number :
- edsdoj.53983574dc124dbcb81b5c41a13a528d
- Document Type :
- article
- Full Text :
- https://doi.org/10.1088/1741-4326/acee14