title: Degree of circular polarization of soft X-rays emitted from a multi-polarization-mode undulator characterized by means of magnetic circular dichroism measurements.
abstract: The degree of circular polarization of soft X-rays emitted from the multi-polarization-mode undulator of BL17SU at SPring-8 has been deduced by means of magnetic circular dichroism in core-level X-ray absorption spectroscopy for a ferrimagnetic Gd-Fe-Co amorphous thin film. The results of reference measurements performed using well characterized undulator radiation of BL25SU at SPring-8 have also been utilized. The degrees of circular polarization were presumed for all the available operational modes and were compared with simple theoretical calculations. It was found that the calculated degrees of circular polarization were validated by the measurements reasonably well and will be useful in further experiments at BL17SU.
authors.affiliation: RIKEN SPring-8 Center, Harima Institute, 1-1-1 Kouto, Sayo-cho, Sayo-gun, Hyogo 679-5148, Japan. oura@spring8.or.jp
authors.forename: Masaki
authors.initials: M
authors.lastname: Oura
authors.forename: Tetsuya
authors.initials: T
authors.lastname: Nakamura
authors.forename: Tomoyuki
authors.initials: T
authors.lastname: Takeuchi
authors.forename: Yasunori
authors.initials: Y
authors.lastname: Senba
authors.forename: Haruhiko
authors.initials: H
authors.lastname: Ohashi
authors.forename: Katsutoshi
authors.initials: K
authors.lastname: Shirasawa
authors.forename: Takashi
authors.initials: T
authors.lastname: Tanaka
authors.forename: Masao
authors.initials: M
authors.lastname: Takeuchi
authors.forename: Yukito
authors.initials: Y
authors.lastname: Furukawa
authors.forename: Toko
authors.initials: T
authors.lastname: Hirono
authors.forename: Toru
authors.initials: T
authors.lastname: Ohata
authors.forename: Hideo
authors.initials: H
authors.lastname: Kitamura
authors.forename: Shik
authors.initials: S
authors.lastname: Shin