Status of the twin helical undulator soft X-ray beamline at SPring-8: Performance for circular dichroism measurements

T. Muro, T. Nakamura, T. Matsushita, T. Wakita, K. Fukumoto, H. Kimura, T. Hirono, T. Kinoshita, T. Hara, K. Shirasawa, M. Takeuchi, H. Kitamura

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

    13 Citations (Scopus)

    Abstract

    The status of the soft x-ray beamline BL25SU at SPring-8 is reported. The beamline performance for circular dichroism measurements using the helicity switching of helical undulator radiation is focused on. Light spots on a sample of the opposite helicities have been observed with a photoelectron emission microscope. The vertical profiles of the spots have almost the same line shape and a positional difference of ∼ 0.5 μm. The horizontal spot positions coincide, but the horizontal spot widths are different by ∼ 7 %. The energy difference of the monochromatized light between the opposite helicities has been estimated to be less than or comparable to 1 meV in the Ne 1s absorption region. The kick angle of the kicker magnets has been increased from 0.2 to 0.3 mrad to avoid penetration of the higher harmonics.

    Original languageEnglish
    Title of host publicationSYNCHROTRON RADIATION INSTRUMENTATION
    Subtitle of host publicationNinth International Conference on Synchrotron Radiation Instrumentation
    Pages571-574
    Number of pages4
    DOIs
    Publication statusPublished - 2007
    EventSYNCHROTRON RADIATION INSTRUMENTATION: 9th International Conference on Synchrotron Radiation Instrumentation - Daegu, Korea, Republic of
    Duration: May 28 2006Jun 28 2006

    Publication series

    NameAIP Conference Proceedings
    Volume879
    ISSN (Print)0094-243X
    ISSN (Electronic)1551-7616

    Other

    OtherSYNCHROTRON RADIATION INSTRUMENTATION: 9th International Conference on Synchrotron Radiation Instrumentation
    Country/TerritoryKorea, Republic of
    CityDaegu
    Period5/28/066/28/06

    Keywords

    • Circular dichroism.
    • Helicity switching
    • Soft x-ray beamline
    • Twin helical undulators

    ASJC Scopus subject areas

    • Physics and Astronomy(all)

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