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Petawatt-class lasers can produce multi-GeV electron beams through laserwakefield electron acceleration. As a by-product, the accelerated electronbeams can generate broad synchrotron-like radiation known as betatronradiation. In the present work, we measure the properties of the radiationproduced from 2 GeV, 215 pC electron beams, which shows a broad radiationspectrum with a critical energy of 515 keV, extending up to MeV photon energiesand 10 mrad divergence. Due to its high energy and flux, such radiation is anideal candidate for gamma-ray radiography of dense objects. We employed acompact betatron radiation setup operated at relatively high-repetition rates(0.1 Hz) and used it to scan cm-sized objects: a DRAM circuit, BNC and SMAconnectors, a padlock and a gas jet nozzle. GEANT4 simulations were carried outto reproduce the radiograph of the gas jet. The setup and the radiation sourcecan reveal the interior structure of the objects at the sub-mm level, provingthat it can further be applied to diagnose cracks or holes in variouscomponents. The radiation source presented here is a valuable tool fornon-destructive inspection and for applications in high-energy-density physicssuch as nuclear fusion.

High-energy betatron source driven by a 4-PW laser with applications to non-destructive imaging