In the framework of the R&D effort for the assessment of the DTT First Wall (FW), a number of small-scale FW mock-ups, applying the Selective Laser Melting (SLM) technology, has been delivered (Fig. 1). 

In DTT, and in all the future fusion power plants, the FW will have to absorb a large part of the heat released by the plasma; the complex cooling system with which it must be equipped and the high thermo-structural resistance it must possess make the design of the FW very challenging.

SLM, which is an Additive Manufacturing process capable of realizing high-performance components with high geometrical precision, has been identified as a well-suited technique for the FW fabrication. 

As a secondary but equally important fallout, this activity will also contribute to qualifying the SLM technique for nuclear applications.

The mock-ups realized so far will allow DTT to confirm the validity of the conceptual design and of the technologies available in the market for the first wall manufacturing.

Fig. 1. Some of the small-scale FW mock-ups