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SPring-8 twin helical undulator.

T Hara1, T Tanaka, T Tanabe

  • 1SPring-8, Kamigori-cho, Ako-gun, Hyogo-ken 678-12, Japan.

Journal of Synchrotron Radiation
|July 21, 2004
PubMed
Summary
This summary is machine-generated.

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The SPring-8 helical undulator offers a simple method for generating circularly polarized light with both horizontal and vertical fields. This innovative design allows for rapid switching of polarization helicity, enhancing experimental capabilities.

Area of Science:

  • Physics
  • Optics
  • Accelerator Science

Background:

  • Producing circularly polarized light often requires complex setups like asymmetric devices or crossed undulators.
  • Existing methods can have limitations in terms of accessibility or complexity.

Purpose of the Study:

  • To introduce a simplified method for generating circularly polarized light using a helical undulator.
  • To describe the design and capabilities of the SPring-8 helical undulator for producing tunable polarization.

Main Methods:

  • Utilizing a helical undulator design with magnet arrays positioned above and below the electron orbit.
  • Implementing two helical undulators in tandem at the SPring-8 BL25SU beamline.
  • Employing five kicker magnets for rapid switching of polarization helicity.

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Main Results:

  • The helical undulator provides a straightforward way to generate both horizontal and vertical fields.
  • The design eliminates limitations on side access to the undulator.
  • Polarization helicity can be switched at frequencies up to 10 Hz.

Conclusions:

  • The SPring-8 helical undulator presents an efficient and accessible solution for producing circularly polarized light.
  • The tandem undulator system with rapid helicity switching enhances experimental flexibility at synchrotron light sources.