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Figure 4
(a) DMM/DCM flux spectra measured at the sample position (40 m from the IU24), with an electron beam current of 400 mA. The spectra are fitted largely well with the calculated spectra (solid curves). (b) Schematic view of the dual monochromators DMM/DCM, with the rotating center of the whole system situated at the center of the first Si(111) crystal. The rotation range of the DMM/DCM platform from 0.965° to 2.068° is for a 15–7 keV beam with DMM, and 4.93° to 29.62° for 23–4 keV with DCM. (c) A typical absorption spectrum of a standard Ti foil taken with the DCM. (d) Deviation of the DCM beam energy after calibration with the ten in-vacuum standard foils (inset) deployed downstream of the DMM/DCM.

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