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A comprehensive overview of the XPP instrument is published inJournal of Synchrotron Radiation, 22, (2015).
The beam can be focused by inserting Beryllium compound refractive lenses in the beam path. The focal length can be adjusted for a given X-ray energy by selecting an appropriate number of individual lenses (up to 10) and stacking them. One can switch from one stack to another (up to three) remotely. Such a unit is located 4 meters upstream from the sample. The focusing unit has the capability to be translated longitudinally ±0.15m. This allows some tunability in the beam size at the sample when not working at the focus.
A robotic detector positioned is used to move various x-ray detectors to a desired location. This system has the capability of positioning the detectors over a spherical surface of radii ranging from 10-100cm. The detector positioned may also be moved in a Cartesian coordinate system.
SLAC National Accelerator Laboratory, Menlo Park, CA
Operated by Stanford University for the U.S. Dept. of Energy