Beamline Optics

 Key Performance

The beamline is sourced by an elliptically polarizing undulator (EPU120). A cylindrical mirror M1 collects the diverging beam from the undulator and horizontal focus the beam to the exist slit-H. The monochromator is Plane Grating Monochromator type, consisting a plane mirror M2 and two different variable line spacing (VLS) gratings. The monochromator energy-disperses VUV-light, which is then focused vertically to the exist slit-V by the VLS gratings. Monochromatized X-ray beam is switchable into two branches by the plane mirror M5. At Branch A, VUV-beam light is refocused by a KB mirror set to a sub-micro size.