The Advanced Photon Source
a U.S. Department of Energy Office of Science User Facility

Circularly Polarized Undulator

Shown in cross-section:

  • 12.8 cm period
  • 500-3000 eV output
  • circular polarization, both left and right
  • linear polarization, both vertical and horizontal
  • switchable polarization
  • compatible with standard ID vacuum chamber, so it can share a straight section
  • open along one side for access by magnetic measurement probes
  • upgraded in Fall 2009 with vanadium permendur poles for horizontal field