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Figure 7
In the upper row, measured wavefronts behind the mirror M2 are shown at the position of the wavefront sensor. The inital wavefront shows a dominant presence of astigmatic contributions (a), wavefront after pitch optimization of M2 (b) and the final wavefront after alignment of roll and x of M2 (c). The peak-to-valley value for each wavefront is given in λ and could be reduced to about half of the initial value. The lower row shows the intensity profiles at the focus position of M2. They were retrieved by Fresnel back-propagation of the intensity profile measured at the position of the wavefront sensor. The focus size in the x and y direction is given as the FWHM for the cross-marked positions. The focus size could be significantly reduced to a circular shape of about 25.5 µm each in the x and y directions.

Journal logoJOURNAL OF
SYNCHROTRON
RADIATION
ISSN: 1600-5775
Volume 26| Part 1| January 2019| Pages 18-27
https://doi.org/10.1107/S160057751801576X
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