Calculation of Alpha Particle Ripple Loss from the CFETR

The paper investigated fusion produced alpha particle ripple loss from the present CFETR (Chinese Fusion Engineering Test Reactor) physical design parameters. Guiding center code calculations of alpha particle ripple loss indicate 0.1 % particle loss for 10 MA, ITER-like equilibrium with pre-sawtooth alpha source profile, and 0.7 % with alpha redistribution modeled source profile after the sawtooth crash. The loss fraction is somewhat larger than the 8 MA ITER-like equilibrium. The calculations of reversed shear plasma showed the 5.6 % particle loss with a sawtooth broadened profile, in which lost particles are highly localized and the heat load is a big concern to plasma facing components. Potentially significant heat load of first wall from the ripple loss of alpha particles with reversed shear is one of critical issues for the steady state operation of CFETR. A comprehensive calculation need further detailed, self-consistent CFETR physical design.