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AMX photon flux at the sample position across the photon energy range 5–18 keV. Measurements performed at 400 mA ring current. At lower energies, the flux is diminished due to absorption in the Be exit window and the remaining air path to the sample (∼30 cm). A 50 µm-thick electronic-grade CVD diamond single-crystal BPM further attenuates the beam intensity but can be retracted.
