Abstract
AbstractKinetic Monte Carlo simulations of coupled atom‐radiation transport in optically thick divertor plasmas can be computationally very demanding, in particular in ITER relevant conditions or even larger devices, e.g. for power plant divertor studies. At high (∼ 1015 cm–3) atomic densities, it can be shown that sufficiently large divertors behave in certain areas like a black body near the first resonance line of hydrogen (Lyman α). This suggests that, at least in part, the use of continuum model (radiation hydrodynamics) can be sufficiently accurate, while being less time consuming. In this work, we report on the development of a hybrid model devoted to switch automatically between a kinetic and a continuum description according to the plasma conditions. Calculations of the photo‐excitation rate in a homogeneous slab are performed as an illustration. The outlined hybrid concept might be also applicable to neutral atom transport, due to mathematical analogy of transport equations for neutrals and radiation.
Highlights
The preparation of large-scale fusion reactor devices (ITER, DEMO) requires accurate transport models for the plasma edge able to account for neutral and charged particles in a self-consistent fashion
In the most optically thick conditions, it can be shown that the divertor of ITER behaves in certain areas like a black body radiator near the first resonance line of hydrogen (Lyman α)
In the same spirit as [4,5], we report on the development of a hybrid formulation of radiation transport, designed in such a way to switch automatically between a kinetic and a continuum description, according to the plasma conditions
Summary
The preparation of large-scale fusion reactor devices (ITER, DEMO) requires accurate transport models for the plasma edge able to account for neutral and charged particles in a self-consistent fashion. In the most optically thick conditions (e.g. with an atomic density approaching locally values of 1015 cm−3 [3]), it can be shown that the divertor of ITER behaves in certain areas like a black body radiator near the first resonance line of hydrogen (Lyman α). This suggests that the use of a continuum model can be as accurate as a kinetic approach, while being less time consuming. The issue of interfacing between kinetic and macroscopic (diffusion) zones is discussed
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