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Parametric scaling of power exhaust in EU-DEMO alternative divertor simulations by A.E. Järvinen; L. Aho-Mantila; T. Lunt; F. Subba; G. Rubino; L. Xiang is a Materials Science article available to read on EtoBox.

What is Parametric scaling of power exhaust in EU-DEMO alternative divertor simulations about?

Investigations of parametric scaling of power exhaust in the alternative divertor configuration (ADC) SOLPS-ITER simulation database of the EU-DEMO are conducted and compared to predictions based on the Lengyel model. The Lengyel model overpredicts the necessary argon concentrations for LFS divertor detachment by about a factor of 5–10 relative to the SOLPS-ITER simulations. Therefore, while the Lengyel model predicts that plasmas with acceptable divertor heat loads in EU-DEMO would exceed the tolerable upstream impurity concentrations by a large margin, there are several SOLPS-ITER solutions within an acceptable operational space. The SOLPS-ITER simulations indicate that, unlike assumed by the standard Lengyel model, there are significant heat dissipation mechanisms other than argon radiation, such as cross-field transport, that reduce the role of argon radiation by a factor of 2 to 3. Furthermore, the Lengyel model assumes that the radiation front is powered by parallel heat conduction only, which tends to lead to a narrow radiation front as the radiative efficiency increases strongly with reducing thermal conductivity. As a result, the radiative volume and total impurity radiati

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Author

A.E. Järvinen; L. Aho-Mantila; T. Lunt; F. Subba; G. Rubino; L. Xiang

Publisher

Elsevier BV

Published

2023

Language

EN

Field

Materials Science (Physical Sciences)