High Resolution Gamma Ray Spectroscopy at MHz Counting Rates With LaBr<formula formulatype='inline'><tex Notation='TeX'>$_{3}$</tex> </formula> Scintillators for Fusion Plasma Applications

High resolution γ-ray spectroscopy measurements at MHz counting rates were carried out at nuclear accelerators, combining a LaBr 3(Ce) detector with dedicated hardware and software solutions based on digitization and off-line analysis. Spectra were measured at counting rates up to 4 MHz, with little or no degradation of the energy resolution, adopting a pile up rejection algorithm. The reported results represent a step forward towards the final goal of high resolution γ-ray spectroscopy measurements on a burning plasma device.