Experimental characterization of a single-shot spectrometer for high-flux, GeV-scale gamma-ray beams

N. Cavanagh, K. Fleck, M. J. V. Streeter, E. Gerstmayr, L. T. Dickson, C. Ballage, R. Cadas, L. Calvin, S. Dobosz Dufrénoy, I. Moulanier, L. Romagnani, O. Vasilovici, A. Whitehead, A. Specka, B. Cros, G. Sarri*

*Corresponding author for this work

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We report on the first experimental characterization of a gamma-ray spectrometer designed to spectrally resolve high-flux photon beams with energies in the GeV range. The spectrometer has been experimentally characterized using a bremsstrahlung source obtained at the Apollon laser facility during the interaction of laser-wakefield accelerated electron beams (maximum energy of 1.7 GeV and overall charge of 207±62 pC) with a 1 mm thick tantalum target. Experimental data confirms the possibility of performing single-shot measurements, without the need for accumulation, with a high signal-to-noise ratio. Scaling the results to photons in the multi-GeV range suggests the possibility of achieving percent-level energy resolution as required, for instance, by the next generation of experiments in strong-field quantum electrodynamics.

Original languageEnglish
Article number043046
Number of pages9
JournalPhysical Review Research
Issue number4
Publication statusPublished - 16 Oct 2023


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