Nuclear spectroscopy measurements on DT fusion reactors based on JET experience

The study of physics and engineering aspects tied to Deuterium-Tritium (DT) nuclear fusion plasmas was recently made possible through a unique opportunity provided by the Joint European Torus (JET) DTE2 and DTE3 experimental campaigns held in 2021 and 2023, respectively. This also allowed the exploitation and validation of the new methods and diagnostics developed in more than twenty years after the first JET DT campaign in 1997. In particular, progresses on the growing processes of synthetic diamonds and inorganic scintillators opened up to new opportunitiesfor nuclear spectroscopy measurements of 14 MeV neutrons and gamma rays. This work presents an overview of the 14 MeV neutron measurements performed by the diamond detector suite installed at JET for ion temperature and fuel ion ratio determination, together with fusion power measurements. Furthermore, the innovative fusion power measurement based on the detection of the gamma-rays emitted by the low probability (1E-5) electromagnetic channel of the DT fusion reaction will be presented.