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However, scattering measurements from laser-driven samples must contend with not only a short-lived and rapidly evolving state but also small scattering cross sections. A continuous, time-resolved scattering measurement would characterize the evolving thermodynamic state while providing unprecedented access to the temporal evolution of the ion\u2013plasma interaction. To provide the required diagnostic capability for such a measurement, we have designed a high-efficiency x-ray spectrometer coupled to a streak camera for use on the National Ignition Facility. The spectrometer utilizes a conically curved crystal to increase solid angle collection and to sagittally focus the signal onto the millimeter-scale streak camera slit. Characterization of the crystals with a Bremsstrahlung x-ray source demonstrates sensitivities 1000-fold higher than existing spectrometers on the National Ignition Facility. 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