Alfvén eigenmode critical-gradient predictions of alpha particle and NBI ion transport in ITER scenarios integrated with microturbulence

The TGLF-EP+Alpha critical-gradient model of Alfvén eigenmode-driven energetic particle (EP) transport is used to predict transport of fusion alpha particles and 1 MeV beam ions in two ITER scenarios: a hydrogen baseline (without fusion alphas) and a deuterium-tritium steady state. This work is part of a larger cross-code DOE EP milestone project. This 1D transport model combines critical-gradient AE-driven transport with EP transport driven by thermal particle-driven microturbulence predicted using the TGLF gyro-Landau fluid model. The TGLF model, with higher resolution to correctly treat AEs, also provides the crucial AE critical gradient used in the TGLF-EP+Alpha transport model. Predictions are compared against two associated DIII-D cases chosen to closely match anticipated q profiles of the ITER cases. AE spectra from global, linear GYRO simulations are shown to contextualize findings from the local transport models. We find larger EP redistribution in the steady-state case than previously reported for the ITER Kinsey case due to a 2.5 times higher fusion rate, and thus stronger mode drive, in the present case.