data set of imaging performance measured at BL16U2 Fast X-ray Imaging Beamline of SSRF

This data set includes 3 different parts: the photon spectrum of the CPMU light source of BL16U2, 500kHz 2D dynamic imaging sequence and 20Hz dynamic CT slice groups. All these data were collected at the BL16U2 Fast X-ray Imaging beamline of SSRF in 2021.First one is the photon spectrum of the CPMU light source of BL16U2. The current of the storage ring is 200 mA, and the gap of the CPMU light source is 6 mm. The horizontal axis of the graph represents the photon energy (keV) and the vertical axis represents the photon flux (phs/s/0.1%BW). Data was calculated by the current of ion chamber while scanning the double-crystal monochromator of BL16U2.The second group of data is the 500kHz 2D dynamic imaging sequence of BL16U2. these images were collected using the dual-channel ultrafast X-ray imaging detector and a Kirana 5M fast camera of BL16U2. The Kirana camera was set to external trigger mode in this experiment and synchronized with the laser loading. The frame rate was configured at 500,000 frames per second (fps) to achieve a favorable signal-to-noise ratio. This camera can capture images at a high frame rate while maintaining a large pixel array of 924×768 pixels and a 10-bit image depth. The optical magnification of the detector has been chosen to be 10×, resulting in an equivalent pixel size of 3 μm. The shows a validation experiment using a fast-foaming polyurethane material system and the mid-speed X-ray imaging detector. The fast camera used in this experiment is pco.dimax HS4. In total, 8 groups of CTs were collected with a monochromatic beam of 15 keV and an effective pixel size of 2.2 μm. The minimum time interval between CTs is 50 ms, proving that the imaging system's dynamic CT time resolution reaches 50 ms.