Towards Integrated Target–SOL–Core Plasma Simulations for Fusion Devices with Liquid Metal Targets
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Published:2023-08-23
Issue:2
Volume:42
Page:
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ISSN:1572-9591
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Container-title:Journal of Fusion Energy
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language:en
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Short-container-title:J Fusion Energ
Author:
Nallo Giuseppe Francesco,Gonzalez Jorge,Bray Elisabetta,Luda di Cortemiglia Teobaldo,Marchetto Chiara,Subba Fabio,Westerhof Egbert,Zanino Roberto
Abstract
AbstractSelf-healing liquid metal divertors (LMDs) based on the Capillary Porous Structure (CPS) concept are currently being considered among the possible solutions to the power exhaust problem in future fusion reactors. Indeed, the passive replenishment of the plasma-facing surface by capillary forces and the self-shielding of the target via vapor emission can potentially improve the divertor lifetime and its resilience to transient loads. On the other hand, the LMD target erosion can be significant due to evaporation and thermal sputtering, on top of physical sputtering, possibly leading to unacceptable core plasma dilution/power losses (for a low-Z/high-Z metal such as Li and Sn, respectively). For this reason, it is necessary to assess whether an LMD is compatible with an European DEMO (EU-DEMO) plasma scenario. This requires a self-consistent model of the impurity emission from the target, the plasma in both the scrape-off layer (SOL) and the core regions and the transport of impurities therein. In this paper, an an integrated modelling approach is proposed, which is based on SOLPS-ITER and includes its coupling with a target erosion model written in FreeFem++ and a core plasma model (ASTRA/STRAHL). An application of the coupled SOL-target model to simulate experiments performed in the Magnum-PSI linear plasma device with a CPS target filled with Li is also included to provide a first demonstration of the capabilities of the approach. Results are promising, being in good agreement (within a few degrees) with the measured target temperature distribution. In perspective, the modelling framework presented here will be applied to the EU-DEMO with an Sn divertor.
Funder
Euratom Research and Training Programme Politecnico di Torino
Publisher
Springer Science and Business Media LLC
Subject
Nuclear Energy and Engineering,Nuclear and High Energy Physics
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