TF Ripple Loss of Alpha Particles from the ITER Interim Design: Simulation and Theory
Authors: M.H. Redi, R.J. Goldston, R.B. White, et al
Ripple loss of alphas can result in reduced alpha heating and potentially severe localized wall damage in fusion reactors. In this paper we show guiding center code (GC) calculations of ripple-induced alpha loss in ITER, under a number of di erent operating conditions for the ITER Interim Design [1]: L-mode, H-mode, post-sawtooth, and reversed-shear config- urations. In all cases except for the last, alpha loss is very small [2, 3]. In the case of reversed-shear operation, alpha banana convection loss can be important. We also present a new theoretical calculation of the stochastic threshold [2], which gives excellent agreement with the much more computationally intensive GC calculations.