Digital twin platform for integrated design of tokamak divertor components: a VOLTA-based workflow for multi-physics integration

Within the EUROfusion framework, the development of future fusion power plant components requires the coordination of multiple disciplines, large amounts of data, and simulation-intensive design activities. In this context, efficient digital workflows are essential to support collaboration, ensure traceability, and reduce the time needed to explore and validate design alternatives. This contribution presents a digital engineering approach based on structured workflow management, parametric modelling, and reduced-order modelling for complex fusion-related applications, with particular attention to divertor design. The proposed framework is designed to integrate heterogeneous tools and data sources within a common process, enabling users to organize design activities, automate simulation chains, and compare alternative solutions in a systematic way. A key objective is to complement high-fidelity analyses with surrogate modelling strategies, so that expensive simulations can be reserved for validation while faster predictive models are used during exploration and optimization. This approach is especially relevant for divertor components, where severe thermal loads, strong physics coupling, and tight engineering constraints make conventional workflows difficult to manage and scale. The contribution highlights how digital platforms and model-based methods can improve efficiency, reusability, and decision support across multidisciplinary fusion design tasks. Overall, the work reflects the growing need for integrated digital methods to support the engineering challenges associated with European fusion research and development, including the divertor as one of the most critical components.