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Figure 3
DuMond diagrams of (a) the undulator spectrum and the incidence side of the diamond crystal (C 111), and (b) the exit side of the diamond crystal and the incidence side of the silicon crystal (Si 111); θB corresponds to the Bragg angle at the nominal energy E0 of 60 keV. (c) Schematic of the beam geometry to estimate the effective horizontal divergence [\delta_{\rm{h}}^\ast] using the intercept theorem (note that [\delta_{\rm{h}}^\ast] is not identical to the source divergence).

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SYNCHROTRON
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