Four-stage diamond spectrometer for low-energy proton identification

A four-stage spectrometer with planar single-crystal chemical vapour deposition (sCVD) diamond sensors is presented. It is capable of measuring low-energy protons in the range of 3 MeV – 22 MeV. In this study, a CIVIDEC B14 Diamond Telescope Detector (Weiss and Griesmayer, 2024) was used to analyse the energy distribution of a proton beam generated by neutron interactions with a polyethylene converter. The background suppression capabilities of the spectrometer are described. The experimental data were compared with Geant4 simulations for a proton beam with a Gaussian energy distribution of 13.7(5) MeV. The comparison shows an excellent agreement between measurement and simulation. The capabilities of the proton spectrometer are finally discussed.