Prediction of isotopic effects in neutral beam experiments in DIII-D

The TGLF-EP$+$Alpha$^{\mathrm{1,2}}$ model of energetic particle (EP) transport is used to predict the transport-limited profile of neutral beam injection (NBI) ions in DIII-D discharges with hydrogen isotopes with super-Alfv\'{e}nic EPs. When NBI mass is reduced, increased Alfv\'{e}n Mach number is destabilizing to Alfv\'{e}n eigenmodes (AEs) but decreased slowing-down time is stabilizing. The TGLF-EP$+$Alpha critical gradient model$^{\mathrm{3}}$ treats both effects self-consistently. We consider two shear-reversed scenarios: and . Across beam powers, a hydrogen beam into a hydrogen plasma increases AE transport over the all-deuterium reference. Competing effects roughly cancel with a hydrogen beam into a deuterium plasma.$\backslash^{\mathrm{1}}$He Sheng and R. E. Waltz, Nucl. Fusion 56, 056004 (2016)He Sheng, R.E. Waltz, and G.M. Staebler, Phys. Plasmas 24, 072305 (2017)$\backslash $super 3R. E. Waltz and E. M. Bass, Nucl. Fusion 54, 104006 (2014)