Recent developments in MHz radioscopy: Towards the ultimate temporal resolution using storage ring-based light sources

Hard X-ray imaging with ultra-high speed acquisition rates using synchrotron-based sources or free-electron lasers has recently gained significant attention: commercially available CMOS-based cameras as basis for indirect detection allow for the use of radioscopy with MHz acquisition rates in a routine manner. Hence, an increasing number of experiments are reported in the literature studying with ultra-high speed radioscopy phenomena ranging from materials research (additive manufacturing), astrophysics (meteorite formation) to dynamic compression (propagation of shock and compression waves). By using the high flux beamline BL40XU of the SPring-8 synchrotron light source this MHz radioscopy approach has been developed further: the outstanding high photon flux density at narrow bandwidth of beamline BL40XU allowed for reaching unprecedented temporal resolution at high X-ray imaging sensitivity. Furthermore, a proto-type of a new ultrahigh speed framing camera was integrated, demonstrating that frame rates close to the native radio frequency of the storage ring should become feasible in the future, i.e. an approach towards GHz radioscopy.