Non-existence of positive glitches in spectra using the YB₆₆ double-crystal monochromator of BL15XU at SPring-8

YB₆₆ is suitable for dispersing synchrotron radiation in the 1-2 keV energy range with a 2d lattice spacing of 1.17 nm. When used with an undulator there are no positive glitches at 1385.6 and 1438 eV in spectra dispersed by a YB₆₆ 400 double-crystal monochromator as observed using bending-magnet or wiggler beamlines. The transmission function of a YB₆₆ double-crystal monochromator has been measured by means of a Si PIN photodetector, and X-ray absorption near-edge structure (XANES) of Mg, Al and Si were measured at high resolution. From all of these experiments it has been clarified that a YB₆₆ double-crystal monochromator is well suited for soft X-ray beamlines on third-generation light sources.