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

12 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
CountryKorea, 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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    Muro, T., Nakamura, T., Matsushita, T., Wakita, T., Fukumoto, K., Kimura, H., Hirono, T., Kinoshita, T., Hara, T., Shirasawa, K., Takeuchi, M., & Kitamura, H. (2007). Status of the twin helical undulator soft X-ray beamline at SPring-8: Performance for circular dichroism measurements. In SYNCHROTRON RADIATION INSTRUMENTATION: Ninth International Conference on Synchrotron Radiation Instrumentation (pp. 571-574). (AIP Conference Proceedings; Vol. 879). https://doi.org/10.1063/1.2436125