The EU-DEMO is one of the most ambitious projects of EUROfusion, aimed at designing a prototype of a nuclear fusion power plant. In 2025 a new Low-Aspect-Ratio (LAR) configuration has been introduced, replacing the past baseline by changing the aspect ratio (A) of the tokamak from 3.1 to 2.8. The LAR has several benefits from the divertor point of view, the main one is the lower heat load on the plasma facing components (PFCs). The peak heat flux to the divertor during reattachment decreased, with respect to the previous EU-DEMO configuration, by about 45%, from ≈82 MW/m2 to ≈44 MW/m2. This work presents the design of the divertor system in the LAR configuration by adopting System Engineering (SE) approach. Starting from previous baseline, the current design is updated with aim of improving the manufacturing, shielding and structural performances. Using the SE approach, previously implemented features can be transferred and modified in a rational way in the new LAR configuration. New PFCs have been proposed as well as new cooling layout for the cassette body. The inboard vertical target design has been modified based on the results obtained from the previous baseline, aiming to improve the shielding performance and reduce the temperature of the supports in normal operations.
Divertor system for EU-DEMO: CAD design progress in the low aspect ratio configuration / Clagnan, A.; Marzullo, D.; Imbriani, V.; Lanzotti, F. G.; Mazzone, G.; Vitolo, F.; You, J. H.. - In: FUSION ENGINEERING AND DESIGN. - ISSN 0920-3796. - 227:(2026), pp. 115704.--115704.-. [10.1016/j.fusengdes.2026.115704]
Divertor system for EU-DEMO: CAD design progress in the low aspect ratio configuration
Clagnan A.
;Marzullo D.;
2026-01-01
Abstract
The EU-DEMO is one of the most ambitious projects of EUROfusion, aimed at designing a prototype of a nuclear fusion power plant. In 2025 a new Low-Aspect-Ratio (LAR) configuration has been introduced, replacing the past baseline by changing the aspect ratio (A) of the tokamak from 3.1 to 2.8. The LAR has several benefits from the divertor point of view, the main one is the lower heat load on the plasma facing components (PFCs). The peak heat flux to the divertor during reattachment decreased, with respect to the previous EU-DEMO configuration, by about 45%, from ≈82 MW/m2 to ≈44 MW/m2. This work presents the design of the divertor system in the LAR configuration by adopting System Engineering (SE) approach. Starting from previous baseline, the current design is updated with aim of improving the manufacturing, shielding and structural performances. Using the SE approach, previously implemented features can be transferred and modified in a rational way in the new LAR configuration. New PFCs have been proposed as well as new cooling layout for the cassette body. The inboard vertical target design has been modified based on the results obtained from the previous baseline, aiming to improve the shielding performance and reduce the temperature of the supports in normal operations.Pubblicazioni consigliate
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