RHEPD (reflection high-energy positron diffraction) station


This station is for the analysis of the atomic configuration of a crystal surface by using the reflection high-energy positron diffraction (RHEPD). In this method, a positron beam is incident on a sample surface with a small glancing angle. When the angle is smaller than a certain critical angle, the beam is totally reflected, making it possible to determine the surface structure accurately. The experiment started with a beam with a collimator in 2011. A brightness enhancement unit using a transmission-type positron remoderator was installed in 2012.

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