The development of the Ion Cyclotron Resonance Heating (ICRH) system for the Divertor Tokamak Test facility (DTT) has reached a key milestone.

On September 30th, the first RF cabinet of the solid-state transmitters successfully completed its factory acceptance tests, confirming the robustness and scalability of the modular architecture adopted for DTT heating generators.

Each RF cabinet houses eight 11-kW solid-state RF modules, arranged in two “bricks,” forming the basic unit of the 1.2 MW transmitters that will power DTT’s ICRH antennas in the 60–90 MHz frequency range.
In addition to the RF modules, the cabinet integrates its dedicated power supplies, cooling system, monitoring electronics, and a local control unit.

During testing, the RF, electrical, thermal, and control performance - under both nominal and mismatched loading conditions - were verified.  The results confirmed efficient power combination, effective thermal management, and the full functionality of protection and diagnostic systems. This achievement follows the successful qualification of the first RF module prototype earlier this year and marks a decisive step toward the realization of the complete 1.2-MW solid-state transmitter.

The transmitters are being developed by a consortium composed of OCEM Power Electronics (Energy Technology Srl) and SyES Srl, who are pioneering the transition to fully solid-state technology for high-power RF generation in fusion research: this innovation represents a significant advancement toward next-generation plasma-heating systems, more efficient, reliable, and easier to maintain