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Full-field Spectral Measurement of a Synchrotron Beam After a Multi-layer Monochromator Using a Hyperspectral X-ray Camera.

Multi-layer monochromator devices (MLMs) are very popular devices at imaging beamlines at synchrotrons around the world, due to their ability to provide X-ray beams with a small bandwidth of several percent while maintaining a high flux that can be used for fast imaging. However, the resulting beam often exhibits oscillations due to thermal instability of the optics [1]. Though these effects have in many cases a negligible effect on the resulting datasets or they are corrected for by specific algorithms, in rare cases they produce a significant contribution to the images. An example hereof is depicted in Fig. 1, which shows a gold foil imaged just above the gold L-edge (11.92 keV). In this figure, a clear inhomogeneity can be observed which differs from the flat-field area of the image.