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Figure 6
Calculated energy spectrum for the first harmonic of the combined U23 and U27 undulators. The blue dotted curve shows the raw spectrum without any attenuation. The green dashed curve is a beamline transmission function that accounts for mirror reflectivity of rhodium at 3.8 mrad and absorption in beryllium windows. The red solid curve is the product of the green and blue curves and shows the limited attenuation of the first harmonic and near-complete suppression of the second harmonic.

Journal logoJOURNAL OF
SYNCHROTRON
RADIATION
ISSN: 1600-5775
Volume 18| Part 4| July 2011| Pages 658-670
https://doi.org/10.1107/S0909049511009423
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