Simplified heat load modeling for design of DEMO discrete limiter

J. Gerardin (1) , M. Firdaouss (2) , F. Maviglia (3) , W. Arter , T. Barrett , M. Kovari

1 IUSTI - Institut universitaire des systèmes thermiques industriels
2 IRFM - Institut de Recherche sur la Fusion par confinement Magnétique
3 Assoc. Euratom-ENEA-CREATE

The design of plasma facing components (PFCs) requires knowledge of the charged particle heat load in the scrape-off layer (SOL). Ray-tracing codes like PFCFlux can model this heat load assuming that particles follow the magnetic field lines. Calculations on limiter equilibria underestimate the heat load significantly. In fact, not all the power circulating in the SOL is reported on the wall, with 80% of the total power circulating in the SOL missing in the worst cases. This paper explains why some power is missing in this case, and presents different ways to rescale the heat load to recover all the power coming from the SOL. The maximum heat load on the limiter for a given magnetic configuration can change from 1MW/m 2 without rescaling to values to values from 3.5 MW/m 2 to 21.7 MW/m 2 depending on the rescaling method.

Mots clés: plasma facing components; charged particles heat load; ray-tracing code; DEMO; limiter; PFCFlux

Domaines: Physique des plasmas [physics.plasm-ph]; Thermique [physics.class-ph]

J. Gerardin, M. Firdaouss, F. Maviglia, W. Arter, T. Barrett, et al.. Simplified heat load modeling for design of DEMO discrete limiter. Nuclear Materials and Energy, 2019, 20, pp.100568. ⟨10.1016/j.nme.2019.01.002⟩. ⟨hal-02190872⟩