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Figure 1
Schematic configuration of the differential pumping scheme adopted. Three stages (1 to 3) are separated by small (<1 mm) apertures (indicated as A1–A4). P0 indicates the pressure at the sample (that can be equal to the ambient pressure). P4 is the required vacuum level of the beamline (typically 10−8 mbar). PPx indicates the pumping ports.

Journal logoJOURNAL OF
SYNCHROTRON
RADIATION
ISSN: 1600-5775
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