In 2026, EUROfusion launched a new Work Package on Theory and Modelling (WPTM) as part of its 2026–2027 research programme. WPTM operates within the E-TASC (EUROfusion Theory and Advanced Simulation Coordination) ecosystem. It works in close collaboration with the Digital Solutions for Fusion Office, the experimental Work Packages—essential for model validation—and under the guidance of the E-TASC Scientific Board, while also engaging with international partners.
One of WPTM key objectives is to develop validated predictive capabilities by transforming existing research codes into widely adopted workflows. Its scientific vision is based on a multi-fidelity approach, spanning from first-principle to reduced models suitable for whole-device simulations and real-time plasma control applications, with dedicated activities on verification, validation, and uncertainty quantification.
WPTM is structured around eleven Theory, Simulation, Verification, and Validation (TSVV) projects, each addressing a distinct yet interconnected plasma physics scientific topic.
Among these, TSVV-H “Reliable Prediction of Plasma Performance and Operational Limits in Tokamaks” leads the effort to further develop and validate the European integrated modelling framework. This framework couples core and edge predictive transport solvers, encompassing robust, validated physics models—to simulate complete tokamak plasma operational scenarios, from breakdown to termination, across a wide range of operating regimes, including ITER-relevant metallic-wall conditions.
The TSVV-H team met at the Culham Campus, hosted by UKAEA from 15 to 19 June 2026. This annual gathering provided an essential opportunity to review progress and advance developments. Particular emphasis was given to surrogate model coupling, large-scale validation, pedestal model integration and code benchmarks. Furthermore, new users could benefit from a hands-on training on the High-Fidelity Plasma Simulator (HFPS) by experienced developers and expert mentors.
About 25 participants joined in-person, including the UKAEA core team developers, ITER Organization, and private sector, i.e. Google DeepMind and Ignition Computing. Together, they reviewed the current status of integrated modelling, developed new collaborative activities, and agreed on the next steps for the project. Remote participants joined the plenary presentations, while the in-person working sessions enabled close collaboration among scientists from different EUROfusion institutes. As always, the scientific discussions often continued over dinner in Oxford or during a beer at one of the local pubs.