Heat bump on a monochromator crystal measured with X-ray grating interferometry

Rutishauser, S.; Rack, A.; Weitkamp, T.; Kayser, Y.; David, C.; Macrander, A.T.

doi:10.1107/S0909049513001817

Journal of Synchrotron Radiation Journal of
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Figure 3
Intensity distribution observed downstream of the monochromator at 38 W incident power. (a) Intensity at the rocking-curve peak. (b) Intensity at 3.5 µrad off the rocking-curve peak. (c) Residual vertical beam angle $[\alpha_{y}]$ at the rocking-curve peak. The average angle in the plot was set to zero, as the interferometer only provides relative measurements. (d) Residual vertical beam angle $[\alpha_{y}]$ at 3.5 µrad off the rocking-curve peak. Relative to the wavefront shown in (c), a wavefront slope change of 7 µrad is measured due to the changed monochromator angle; this contribution has been subtracted from the plotted data. After subtraction the relative difference between (c) and (d) is about 2%.

JOURNAL OF
SYNCHROTRON
RADIATION

ISSN: 1600-5775

Volume 20| Part 2| February 2013| Pages 300-305

doi:10.1107/S0909049513001817

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