The goal of the dual KB mirror system for the CXI beamline of the LCLS-HE upgrade is to realize both micro-focusing and nano-focusing functions over a photon energy range of 7-21 keV. This system consists of two pairs of bendable mirrors with the length of 1 m. The dynamical range of the mirror bending is up to 104 due to the fine adjustment of the focusing length to 1 mm over a 10 m range. The prefigured shape and the width profile of each mirror are optimized to have good performance for both functions.
In this work we present the application of a 2D single grating wavefront sensor to align and characterize the 100 nm focus at the Coherent X-ray Imaging (CXI) endstation at the Linac Coherent Light Source (LCLS). The results agree well with a model of the system, indicating that the mirrors perform as designed when alignment is optimized. In addition, a comparison with the imprint technique confirms the validity of the results, which showed that wavefront-based alignment resulted in negligible astigmatism. Analysis of the retrieved focus profile indicates that intensities <1021 W=cm2 are achievable with currently available LCLS beam parameters and optimal mirror alignment.
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