Transport study on development of fuels and ash density profiles in start-up phase of JA DEMO using TASK code

Abstract

This study has investigated the effect of particle transport of fuel ions (deuterium (D) and tritium (T)) and helium ash (He) as well as their heat transport on the nuclear fusion output in a DEMO reactor. The result was assessed and possible start-up scenarios for DEMO was discussed. In the study, the integrated tokamak modeling code, TASK/TR is used, and for turbulent transport model, the current diffusive ballooning mode (CDBM) has been utilized to investigate the hydrogen isotope effect on the fusion power output. Also, the effect of He build up has been discussed by introducing the mass-dependent enhancement of He transport. The result has suggested that efficient fueling of D and T to the core region of burning plasma with internal transport barrier is difficult without anomalous inward pinch, and helium build up is significant when only neoclassical and CDBM type of turbulent transport is considered for particle transport.