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Compact spectroscopy of keV to MeV X-rays from a laser wakefield accelerator. 2021

A Hannasch, and A Laso Garcia, and M LaBerge, and R Zgadzaj, and A Köhler, and J P Couperus Cabadağ, and O Zarini, and T Kurz, and A Ferrari, and M Molodtsova, and L Naumann, and T E Cowan, and U Schramm, and A Irman, and M C Downer
Department of Physics, The University of Texas at Austin, Austin, TX, 78712-1081, USA.

We reconstruct spectra of secondary X-rays from a tunable 250-350 MeV laser wakefield electron accelerator from single-shot X-ray depth-energy measurements in a compact (7.5 × 7.5 × 15 cm), modular X-ray calorimeter made of alternating layers of absorbing materials and imaging plates. X-rays range from few-keV betatron to few-MeV inverse Compton to > 100 MeV bremsstrahlung emission, and are characterized both individually and in mixtures. Geant4 simulations of energy deposition of single-energy X-rays in the stack generate an energy-vs-depth response matrix for a given stack configuration. An iterative reconstruction algorithm based on analytic models of betatron, inverse Compton and bremsstrahlung photon energy distributions then unfolds X-ray spectra, typically within a minute. We discuss uncertainties, limitations and extensions of both measurement and reconstruction methods.

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