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Arbitrary polarization control with a segmented APPLE-II undulator.

Kento Inaba1, Yoshiyuki Ohtsubo1, Akane Agui1

  • 1NanoTerasu Center, National Institutes for Quantum Science and Technology (QST), Sendai, Miyagi 980-8572, Japan.

Journal of Synchrotron Radiation
|December 15, 2025
PubMed
Summary
This summary is machine-generated.

A new APPLE-II undulator offers flexible X-ray polarization control for spectroscopy. This technology enables precise tuning of photon polarization, advancing soft and tender X-ray applications.

Keywords:
APPLE-II undulatorpolarization controlsegmented undulators

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Area of Science:

  • Physics
  • Materials Science
  • Spectroscopy

Background:

  • Advanced X-ray sources are crucial for spectroscopy.
  • Controlling photon polarization enhances material analysis.
  • Existing undulators have limitations in polarization versatility.

Purpose of the Study:

  • To develop and evaluate a novel four-segmented APPLE-II undulator.
  • To achieve arbitrary polarization control in the soft to tender X-ray region.
  • To enable versatile X-ray absorption spectroscopy at NanoTerasu BL13U.

Main Methods:

  • Utilized a four-segmented APPLE-II undulator design.
  • Employed electromagnetic phase shifters to adjust synchrotron radiation phase.
  • Investigated polarization control across the 180-3000 eV energy range.

Main Results:

  • Demonstrated arbitrary linear polarization control from circularly polarized light.
  • Successfully generated and controlled elliptically polarized radiation.
  • Achieved versatile polarization states, including control over ellipticity angles.

Conclusions:

  • The developed undulator provides unprecedented polarization control for X-ray spectroscopy.
  • This technology significantly enhances the capabilities of synchrotron light sources.
  • Future work includes exploring third-harmonic generation for tender X-ray circular polarization.