Parametric study of the radiative load distribution on the EU-DEMO first wall due to SPI-mitigated disruptions

Moscheni, M.; Carr, M.; Dulla, Sandra; Maviglia, F.; Meakins, A.; Nallo, Giuseppe Francesco; Subba, F.; Zanino, Roberto

doi:10.1016/j.fusengdes.2021.112917

Cited by 3 publications

(1 citation statement)

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“…to determine whether the temperature far from the strike point is lower than the Li retention limit, or to estimate whether radiation can be sufficient to keep the LM molten throughout the whole target. The radiation load was estimated with the Monte Carlo ray-tracing code CHERAB [54][55][56][57] for the case n e,sep = 4.5 × 10 19 m −3 , without Ar seeding, see figure 11. The estimated peak value of q rad,tar is 1.33 MW m −2 in the case of Li and 1.97 MW m −2 with Sn, i.e.…”

Section: Results Without Ar Seedingmentioning

confidence: 99%

SOLPS-ITER simulations of a CPS-based liquid metal divertor for the EU DEMO: Li vs Sn

Nallo¹,

Mazzitelli²,

Moscheni³

et al. 2022

Nucl. Fusion

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In this work, we study the effect of installing a liquid metal divertor (LMD) using a capillary-porous structure in the EU DEMO tokamak within the same envelope of the baseline solid divertor. We used the SOLPS-ITER code to model the Scrape-Off Layer (SOL) plasma and neutrals, coupled to a target thermal model to enable the self-consistent calculation of the LM target erosion rate, and adopting a fluid neutral model for the sake of simplicity. First calculations considering only D and Li (or Sn) showed a significant reduction of the steady state target heat load with respect to simulations considering only D, thanks to vapor shielding. Nevertheless, the computed peak target heat flux (~31 MW/m2 and ~44 MW/m2 for Li and Sn, respectively) was still larger than/borderline to the power handling limit of the LMD concepts considered. Moreover, the impurity concentration in the pedestal - a proxy for the core plasma dilution/contamination - was computed to be above/close to tolerability limits suggested by previous COREDIV calculations. These results indicate that the operational window of an LMD for the EU DEMO, without any additional impurity seeding, might be too narrow, if it exists, and that Sn looks more promising than Li. A second set of calculations was then performed simulating Ar seeding in the SOL, to further reduce the target heat load, and consequently the metal erosion rate. It was found that the mitigation of the plasma heat load due to Ar radiation in the SOL effectively replaces the radiation associated to vapor shielding in front of the target, thus allowing to operate the LMD in a regime of low target erosion. The resulting operational window was found to be significantly wider, both in terms of tolerable peak target heat flux and of acceptable core plasma contamination.

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Section: Results Without Ar Seedingmentioning

confidence: 99%