Abstract
Alpha particle confinement is crucial for sustaining burning plasmas and designing future reactor concepts. Along with classical/prompt losses, various MHD instabilities can lead to wave-particle interactions which can transport alpha particles outward from the plasma. This can result in a reduction in plasma heating/performance, and, at worst, damage in-vessel components. JET's recent DT campaigns in 2021-2023 have produced numerous alpha particle loss measurements with its scintillator probe and Faraday cup fast ion loss detectors (FILDs). This presentation will report on supportive integrated modeling of these measurements. In particular, case studies are performed on a variety of MHD, including: fishbones, neoclassical tearing modes (NTMs), kink modes, and sawtooth crashes. Additionally, a special case of an alpha-driven toroidal Alfv\'{e}n eigenmode (TAE) will be briefly discussed. Lastly, the impact of toroidal field ripple and its interplay with instabilities will be discussed. The modeling is accomplished with the TRANSP and ORBIT-kick codes with the use of recently developed reduced models for calculating mode structure, amplitude, and dynamics. When possible, constraints and comparisons to experiment are conducted with some mode structures taken from analytic theory.
*This manuscript is based upon work supported by the U.S. Department of Energy, Office of Science, Office of Fusion Energy Sciences, and has been authored by Princeton University under Contract Number DE-AC02-09CH11466 with the U.S. Department of Energy. This work has been carried out within the framework of the EUROfusion Consortium, partially funded by the European Union via the Euratom Research and Training Programme (Grant Agreement No 101052200 — EUROfusion). The Swiss contribution to this work has been funded by the Swiss State Secretariat for Education, Research and Innovation (SERI). Views and opinions expressed are however those of the author(s) only and do not necessarily reflect those of the European Union, the European Commission or SERI. Neither the European Union nor the European Commission nor SERI can be held responsible for them.
