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

Abstract

We report on the first experimental characterisation of a gamma-ray spectrometer designed to spectrally resolve high-flux photon beams with energies in the GeV range. The spectrometer has been experimentally characterised 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$\pm$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.

20 pages, 7 figures; changes - expanded explanations, results and conclusions unchanged

References in corpus (9)

• Nonlinear collective effects in photon-photon and photon-plasma interactions
• Charged particle motion and radiation in strong electromagnetic fields
• Ultra-high brilliance multi-MeV $\gamma$-ray beam from non-linear Thomson scattering
• Conceptual Design Report for the LUXE Experiment
• Quantum radiation reaction in laser-electron beam collisions
• Trident pair production in strong laser pulses
• Design of a Compact Spectrometer for High-Flux MeV Gamma-Ray Beams
• Single Particle Detection System for Strong-Field QED Experiments
• A laser-plasma platform for photon-photon physics

Cited by in corpus (1)

• A dump leakage calorimeter to measure the flux of high-energy electrons and photons