Speaker
Description
The Divertor Tokamak Test (DTT) facility, currently under construction at ENEA Research Center in Frascati, is a high-field superconducting device designed to investigate the power exhaust solutions for future DEMO-class reactors. It will feature actively cooled tungsten components to test advanced magnetic configurations, which requires a highly accurate magnetic diagnostics for plasma control and vertical stabilization.
Integrated directly into the machine's architecture, the DTT magnetic diagnostics provide essential information for machine protection and stable plasma equilibrium. The design features optimized sensor arrays engineered to measure fundamental plasma parameters, including plasma shape, and complex phenomena, such as perturbations, eddy and halo currents.
Consisting of roughly 1,000 internal and external sensors, the system utilizes model-based optimization to maintain errors below 1% for plasma current reconstruction and under 1 cm for centroid positioning. Furthermore, dedicated bi-axial pick-up coils embedded in the divertor cassette enable precise, real-time control of the X-point and strike points during advanced divertor configurations.
The DTT magnetic diagnostics team has addressed critical design constraints, including extreme operational stresses, such as high temperature gradients during wall conditioning and baking procedures, stray radiation from ECRH systems, neutron fluxes, and electromagnetic loads, in addition to severe space limitations particularly on the high-field side. The system requires careful integration with the water-cooled first wall and vacuum vessel to manage project bottlenecks and ensure proper installation.
Finally, since the required novel sensors cannot be replaced via remote handling during the extensive DTT operational phase, a strategic level of hardware redundancy has been incorporated into the design.