Fast Ion Transport Studies in JET in Preparation for DT Experiments*

This presentation reports the efficacy of an energetic particle transport model against saturated kink-modes and sawteeth in JET plasmas. The mode-resonant transport during the internal kink growth phase is compared against the drastic fast ion phase-space redistribution from sawtooth crashes. This report aims to classify and validate the dominant transport mechanism with numerical modeling constrained by experimental measurements. A detailed examination of the fast ion phase-space dependencies, resonances, and induced losses associated with the resonant kink mode and non-resonant sawtooth stochastization transport mechanisms will be presented. Lastly, an initial analysis of alpha particle losses from JET's 2021 T and DT campaign will be presented. The ORBIT-kick model forms the basis of the transport studies with realistic fast ion distributions produced from TRANSP. A recently created sawtooth model within ORBIT and the ideal MHD code NOVA provide the mode structures and properties. The resulting energetic particle transport is validated against experimental loss measurements through the incorporation of a synthetic fast ion loss detector within ORBIT. Additionally, the model is cross-referenced against loss ion scintillator probe and gamma spectroscopy measurements.