Pixelated Detector With Photon Address Event Driven Time Stamping and Correlation

We present the design, manufacture, and test results of an asynchronous event-driven address time-stamped (EDATS) pixelated array detector, operational over correlation time spans ranging from less than 10^-6 to greater than 10⁴ s. The pixelated EDATS detector was designed to measure the equilibrium density fluctuations on a nanometer-length scale using small angle X-ray scattering in X-ray photon correlation spectroscopy (XPCS) experiments. The detector sensor chip assembly (SCA) includes a custom readout integrated circuit (ROIC), hybridized to a silicon photodiode array, optimized for 500 to 2000 eV X-ray photons. The detector is shown to be capable of handling X-ray photon event rates of 100 million X-ray events per second, with less than 85 ns timing jitter per event.