Current status of the LEBRA-PXR source at Nihon University and the plan of the evolution

A X-ray source based on parametric X-ray radiation (PXR) has been operated as a users facility at the Laboratory for Electron Beam Research and Application (LEBRA), Nihon University. A monochromatic and energy-selective Xray beam can be produced with a double-crystal-type PXR source using a 100-MeV electron beam. X-ray imaging has been main application of the LEBRA-PXR source, including advanced imaging techniques such as diffraction-enhanced imaging (DEI). A new project to utilize higher-order crystal planes as a PXR radiator is in consideration to boost up the PXR-energy range. A specific bent-crystal system is also proposed for focusing a PXR beam. (author)