The production of DTT’s Toroidal Field superconducting windings is moving full speed ahead. 90% of the conductors and 40% of windings completed. Six TF coils are already completed and tested, marking a major milestone in the construction of the facility and the advancement of its superconducting magnet system.

The manufacturing and delivery of Nb₃Sn superconducting cables for the Toroidal Field (TF) coils are proceeding as planned. By the end of 2025, ICAS srl—Italian company building on ENEA’s long-standing expertise in superconductivity—successfully produced and delivered 80 superconductors for 16 TF coils. The remaining 10 conductors, required to complete the final two coils, are scheduled for delivery in the first quarter of 2026.

The conductor, over 200 meters long, consists of 420 Nb₃Sn strands and 180 copper strands, enclosed in a 2 mm thick AISI 316LN steel jacket. The system is designed to operate at 42.5 kA and 4.5 K in magnetic fields up to 11.9 T,

Each conductor is wound into its characteristic D-shape, heat treated to activate the Nb₃Sn superconducting phase, and completed with insulation and terminals. Five winding packs are then assembled and epoxy-impregnated by ASG Superconductors SpA at its La Spezia facility, where TF coil manufacturing is underway.

To date, ASG has completed and factory-tested six TF coils, while seven additional units are progressing in parallel. The next milestone will be their integration into the stainless-steel casings to be supplied by De Pretto Industries SpA, confirming the steady advancement of DTT’s superconducting magnet system.