Particle Orbit Tracer Code (PTC) with Application to Integrated Modeling for CFETR

The Chinese Fusion Engineering Test Reactor (CFETR) has completed its conceptual design and aims to fill the gap between ITER and the first fusion demonstration reactor (DEMO). Integrated modeling with selfconsistent coupling of equilibrium, transport, heating and current drive (H&CD) can provide more detailed physical designs for CFETR. In this study, Particle Orbit Tracer Code (PTC)
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containing neutral beam injection (NBI) model, is coupled into a modified kinetic-EFIT workflow
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in OMFIT integrated simulation platform, where PTC provides the profile of pressure, particle sources, and H&CD sources, etc. Using the above workflow, steady-state scenario for CFETR with fusion power near 200 MW is developed, and Tangency Major Radius, energy and injection power of NBI are optimized. Furthermore, in the kinetic-EFIT workflow, the simple delay model of ONETWO
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| is typically employed to calculate the heating effect of $\alpha$ particles. For a more precise evaluation of the heating effect of $\alpha$-particles, the PTC model, which considers the finite width effects of particle orbits, is employed to further refine the hybrid scenario for CFETR with fusion power near 1 GW. The simulation results are significantly different compared to the workflow using the simplified delay model, indicating a reduction in the heating of the background ions and particle confinement, thus resulting in a reduction in the fusion gain Q by $9.1 \%$. Consequently, this study further confirms the importance of the finite width effects or neoclassical transport of the $\alpha$-particles.