Polarization-analyzed resonant inelastic x-ray scattering of the orbital excitations in KCuF3

We report a Cu K-edge resonant inelastic x-ray scattering (RIXS) study of orbital excitations in KCuF3 . By performing the polarization analysis of the scattered photons, we disclose that the excitation between the eg orbitals and the excitations from t2g to eg exhibit distinct polarization dependence. The polarization dependence of the respective excitations is interpreted based on a phenomenological consideration of the symmetry of the RIXS process that yields a necessary condition for observing the excitations. In addition, we show that the orbital excitations are dispersionless within our experimental resolution.Comment: 5 pages, 3 figure

SPring-8 BL36XU: Catalytic Reaction Dynamics for Fuel Cells

A tapered undulator beamline BL36XU was constructed at SPring-8 to conduct structural and electronic analysis of dynamic events on polymer electrolyte fuel cell (PEFC) cathode catalysts for the development of next-generation PEFCs. BL36XU provides various time and spatially resolved XAFS techniques in an energy range from 4.5 to 35 keV for investigating PEFCs under the operating conditions. In addition, we developed in-situ complementary measurement systems, such as in-situ time-resolved XAFS/XRD and ambient pressure HAXPES systems. This report describes the performance and present status of the BL36XU

Demagnetization of Nd-Fe-B Permanent Magnet at 2.5 GeV Electron Accelerator

Permanent magnets Nd(2)Fe(14)B are the main component of the insertion devices of the synchrotron radiation facilities and used at other accelerators. The radiation induced demagnetization of permanent magnets, becomes one of the most important issues of the next generation light sources. To investigate the radiation damage the magnetic field change of Nd(2)Fe(14)B magnet exposed to a 2.5 GeV electron beam has been measured. The radiation field near the magnet and the distribution of energy deposition in the magnet are studied with Monte Carlo code FLUKA. The radiation induced demagnetization is analyzed and a fitted formula is proposed to estimate the relative reduction of remanence.

ESTIMATIONS FOR DEMAGNETIZATION OF ID PERMANENT MAGNETS DUE TO INSTALLATION OF OTR

Abstract Demagnetization due to installation of OTR to check the electron beam performance during the operation has been estimated for the permanent magnets of insertion device of XFEL/SPring-8. The estimation of the demagnetization has been performed quantitatively as functions of the electron energy, the gap width of the ID, and the dependence on material of the OTR

DIAMOND-BASED BEAM HALO MONITOR EQUIPPED WITH RF FINGERS FOR SACLA*

Abstract The diamond-based bea