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| 100 | 1 | _ | |a Tokar, Mikhail |0 P:(DE-Juel1)5089 |b 0 |e Corresponding author |
| 245 | _ | _ | |a An assessment for the erosion rate of DEMO first wall |
| 260 | _ | _ | |a Vienna |c 2018 |b IAEA |
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| 520 | _ | _ | |a In a fusion reactor a significant fraction of plasma particles lost from the confined volume will reach the vessel wall. The recombination of these charged species, electrons and ions of hydrogen isotopes, is a source of neutral molecules and atoms, recycling back into the plasma. Here they participate, in particular, in charge-exchange (c-x) collisions with the plasma ions and, as a result, atoms of high energies with chaotically oriented velocities are generated. A significant fraction of these hot neutrals will hit the wall, leading, as well as the outflowing fuel and impurity ions, to its erosion, limiting the reactor operation time. The rate of the wall erosion in DEMO is assessed by applying a one-dimensional model which takes into account the transport of charged and neutral species across the flux surfaces in the main part of the scrape-off layer, beyond the X-point vicinity and divertor, and by considering the shift of the centers of flux surfaces, their elongation and triangularity. Atoms generated by c-x of recycling neutrals are modeled kinetically to define firmly their energy spectrum, being of particular importance for the erosion assessment. It is demonstrated the erosion rate of the DEMO wall armor of tungsten will have a pronounced ballooning character with a significant maximum of $0.3$ mm per full power year at the low field side, decreasing with an increase in the anomalous perpendicular transport in the 'far' SOL or the plasma density at the separatrix. |
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