Measurements of Alfvén Eigenmode stability in the 2021 JET DT campaign
ORAL
Abstract
We present measurements of Alfvén Eigenmode (AE) stability from the 2021 JET DT campaign. The AE Active Diagnostic resonates with stable AEs and measures total damping rates γ < 0, eigenfrequencies, and toroidal mode numbers [Fasoli 1995 PRL]. Of 2000+ datapoints in 200+ DT discharges, we highlight measurements that can be compared to reference D or T plasmas: stable edge EAEs during modulations of the NBI power and alpha population; simultaneous un/stable AEs in the search for nonlinear coupling of fast ions, turbulence, and AEs; and first-ever stability measurements during JET energetic particle afterglow experiments. We use the kinetic-MHD code NOVA-K to identify eigenmodes, assess stability, and evaluate the contribution, if any, from alphas.
*Supported by US DOE grants DE-SC0014264, DE-AC02-09CH11466, DE-SC0020412, and DE-SC0020337. This work has been carried out within the framework of the EUROfusion Consortium, funded by the European Union via the Euratom Research and Training Programme (Grant Agreement No 101052200 - EUROfusion). Views and opinions expressed are however those of the author(s) only and do not necessarily reflect those of the European Union or the European Commission. Neither the European Union nor the European Commission can be held responsible for them.
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Presenters
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Roy A Tinguely
- Massachusetts Institute of Technology
- MIT