Conceptual design of CVD diamond tomography systems for fusion devices

In previous studies, excellent results have been achieved by installing Soft X-ray and UV diamond photodetectors at JET and FTU, suggesting the great potential of such devices for fusion plasma diagnostics. The main limitation in applying thin CVD diamond detectors to plasma tomography systems was the failure to detect photons with energy higher than 3 keV. In this work, we present the investigation of the detection capabilities of two additional detector layouts: the LAT diamond detector prototype, optimized for photons of energy higher than 10 keV, and the IEC diamond detector, optimized for monitoring fast events in the lower energy range. Tests have been conducted at the NIXT laboratory and with the DPP source, two ENEA Frascati Research centre facilities. The results achieved allow the design of a diamond-based tomography system for the future DTT fusion device that includes all three CVD diamond configurations for an efficient detection of radiation emitted from the hot core all the way down to the edge, as well as of the fastest phenomena associated with pellet injection and ELMs.