XPP Components

A comprehensive overview of the XPP instrument is published in
Journal of Synchrotron Radiation, 22, (2015).

X-ray Focusing Lenses

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 ±0.15 m. This allows some tunability in the beam size at the sample when not working at the focus.

Laser in-coupling Box(LIB)

The optical laser is coupled with X-rays in this chamber.

The chamber also has X-ray optics for narrow bandwidth (high quality channel cut crystals) and polarization control (diamond phase retarders) options.

Diffractometer

A configurable diffractometer system is available at XPP. The system is capable of positioning a wide variety of sample environments with a platform setup. The top surface of the platform diffractometer is 400 x 400 mm². The distance between the top surface of the diffractometer and its center or rotation is 230 mm nominal. The top stages of the platform may be replaced with a kappa diffractometer that may be more appropriate for positioning small samples over a wide angular range.

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 10-100 cm. The detector positioned may also be moved in a Cartesian coordinate system.

Low-T chamber

XPP offers general purpose low temperature environment using liquid helium flow cryostat. With the chamber, typical operation temperature is 16K- combining partial 3 axis diffractometer. The chamber is compatible with THz and Mid-IR as well as collinear and non-collinear geometry of UV-NIR laser wavelength.