Conceptual studies of a high-energy X-ray detector system for MaRIE/DMMSC

Current X-ray imaging cameras used in synchrotrons, such as the Advanced Photon Source (APS), and X-ray free-electron lasers, such as the Linac Coherent Light Source (LCLS), are limited to $\le $ 10 MHz frame-rate. Higher frame-rate, $\ge $100 MHz, X-ray cameras are recognized as an enabling technology for science applications at next-generation X-ray sources such as APS-U, LCLS-II, and Dynamic Mesoscale Material Science Capability (DMMSC, formerly MaRIE). In addition to an order of magnitude higher frame-rate, other requirements include: high-efficiency detection of high-energy (\textgreater 20 keV) photons, and sufficiently high spatial resolution. The necessary camera performance also depends on the scattering object/target under dynamic compression. Here, we summarize detector system requirements for DMMSC as a function of scattering angle, detector-target distance and other parameters. We conclude that a combination of different detector systems will allow the optimal capture of scattered X-rays over nearly the entire 4-pi solid angle. Possible alternative detector designs are presented, and community input is sought on best approaches to optimize the data yield from dynamic material experiments using high energy X-rays.