HiSOR multimode undulator as a circularly polarized light source

A linear/helical multimode undulator, which is installed at storage ring in Hiroshima Synchrotron Radiation Center, is initially designed for the utilizing of circularly polarized light from its fundamental harmonic in the spectral range of 4 - 40 eV. Operating of the undulator in elliptical configuration may considerably extend this spectral region. This paper presents a study for the optimisation of operating parameters of a linear/helical multimode undulator with the aim to maximize the circularly polarized high-energy photons output. The comparison with the correspondent characteristics of synchrotron radiation from bending magnet is performed. The results presented here were obtained for the general case that provides a means of applying derived expressions for any kind of elliptical wiggler as well as bending magnet

Observation of circularly polarized radiation from multimode undulator at HiSOR

The linear / helical multimode undulator that is able to produce polarized radiation of any ellipticity operates successfully in Hiroshima Synchrotron Radiation Center. Polarization measurements have been performed for helical mode of undulator using IR-UV polarimeter at the beamline BL9 of the 700 MeV storage ring (HiSOR). High degree of circular polarization has been obtained. The comparison between achieved performance and numerical simulation was made. The main reason of slight distinction between them was found to be in the influence of non-undulator radiation

High Resolution Cu L3,2-Edge XANES Studies of Cu-Au Alloys

High resolution Cn L3,2-edge XANES have been obtained for Ca metal and a series of Cu-Au alloys (Cu3-Au, CuAu and. CuAu3). It was found that the Cu L3-edge XAMES for all the samples under investigation exhibit the characteristic three-peak resonances predicted by theory. The Cu L3-edge XANES shows some interesting systematics which can be correlated to charge redistribution in Ca-Au alloys