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We present a novel implementation of a Monte Carlo particle-following codefor solving the distribution function of minority species in fusion plasmas,called ASCOT5, and verify it using theoretical results for neoclassicaltransport. The code has been developed from ground up with an OpenMP-MPI hybridparadigm to take full advantage of current and next generation many-core CPUswith multithreading and SIMD operations. Up to 6-fold increase in performanceis demonstrated compared to a previous version of the code which only utilizesMPI. The physics model of the code is comprehensively validated againstexisting theoretical work, and it is shown to faithfully reproduce neoclassicaldiffusion across three different collisionality regimes. In simulations forrealistic tokamak plasmas, including complex non-axisymmetric geometry, ASCOT5is verified to reproduce results from the previous version ASCOT4.

High-performance orbit-following code ASCOT5 for Monte Carlo simulations in fusion plasmas