Fast X-ray spectrum and image acquisition method for the XFEL facility.

X-ray free electron laser (XFEL) can provide X-ray light with about four order of magnitude higher flux than synchrotron radiation. Pulse light from XFEL interacts with the target and the resulting photons are collected by detectors. The strong intensity of XFEL will make multiple photons hit on one detector pixel and affect the photon energy measurement. Although increasing the distance between the target and detector could reduce the photons pile-up, it causes a waste of photons. So the traditional photon counting spectrum acquisition method is not advantageous in the XFEL case. To meet the requirements on both spectrum acquisition and imaging, we propose a new detection method in this paper.