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With the advent of high repetition rate laser facilities, novel diagnostictools compatible with these advanced specifications are in demand. This paperpresents the design of an active gamma-ray spectrometer intended for these highrepetition rate experiments, with particular emphasis on functionality within aPW level laser-plasma interaction chamber's extreme conditions. Thespectrometer uses stacked scintillators to accommodate a broad range ofgamma-ray energies, demonstrating its adaptability for various experimentalsetups. Additionally, it has been engineered to maintain compactness,electromagnetic pulse resistance, and ISO-5 cleanliness requirements whileensuring high sensitivity. The paper also outlines the unfolding process, torecover the gamma-ray spectrum from the spectrometer's captured image thanks toa calibration using a $^{60}$Co source.

Compact in-vacuum gamma-ray spectrometer for high-repetition rate PW-class laser-matter interaction