The U.S. Army Research Laboratory and Lawrence Livermore National Laboratory have devel-oped a Multi-Energy Flash Computed Tomography (MEFCT) diagnostic for characterizing mate-rials under extreme loadings at microsecond timescales. In theory, integration of x-ray computed tomography is well suited for characterization of these experiments because it uses penetrating radiography to visualize features beyond the outermost material layers, dust clouds, fire-balls, etc., which often obscure optical techniques. This, combined with the benefits of in situ three-dimensional imaging, extends our ability to observe many material-response features commonly associated with loadings that surpass the material yield, including large scale compressions, mate-rial flow, and material failure and fragmentation. This work provides an overview of the newly designed system, and demonstrates the modifications needed to extend the capabilities of medi-cal X-ray computed tomography [1-3] and high-speed computed tomography , to produce a system that captures three independent, time-sequenced volume reconstructions throughout the timespan of a typical dynamic event. The system incorporates fifteen individual flash x-ray sys-tems into a single unit that acquires fifteen unique image projections of a scattering body with sub-microsecond temporal resolution. Each of three computed tomography volume reconstruc-tions is then created independently using five of the projections paired with iterative solving rou-tines.
To demonstrate the diagnostic’s capabilities, examples from two experiments will be pre-sented: a ballistic impact into an aluminum plate demonstrating penetration and fragmentation, and detonation of a high explosive cylinder to image a detonation front. The examples will high-light many of the nuances associated with this diagnostics data collection capability, and com-parative modeling will demonstrate how integration of the experimental techniques can provide insight