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Variable linear polarization from an X-ray undulator.

A T Young1, E Arenholz, S Marks

  • 1Advanced Light Source Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA. atyoung@lbl.gov

Journal of Synchrotron Radiation
|July 2, 2002
PubMed
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A novel X-ray undulator offers continuously tunable linear polarization, enabling versatile soft X-ray applications. This advancement provides precise control over X-ray polarization angles for advanced material analysis.

Area of Science:

  • Physics
  • Materials Science
  • Synchrotron Radiation

Background:

  • Elliptically polarizing undulators (EPUs) offer control over X-ray polarization.
  • Existing undulators have limitations in precise linear polarization control.

Purpose of the Study:

  • To design and construct a new X-ray undulator with user-selectable linear polarization angles.
  • To demonstrate the versatile polarization control capabilities of the new undulator.

Main Methods:

  • The undulator design is based on the Apple-II EPU, utilizing longitudinal magnet motion for polarization rotation.
  • Magnetic field analysis was performed with varying undulator parameters.
  • X-ray absorption spectroscopy was used to measure linear dichroism in an oriented polytetrafluoroethylene thin film.

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Main Results:

  • The new undulator successfully produces linearly polarized soft X-rays with continuously adjustable polarization angles.
  • Measurements of linear dichroism in polytetrafluoroethylene confirmed the undulator's polarization rotation capabilities.
  • The device integrates variable linear polarization with existing circular and elliptical polarization modes.

Conclusions:

  • The developed X-ray undulator provides unprecedented control over soft X-ray polarization.
  • This technology enhances capabilities for advanced material characterization and scientific research.
  • The device opens new avenues for experiments requiring precise polarization manipulation.