Development of an all-electromagnetic circular polarizing quasi-periodic undulator is underway at the Advanced Photon Source (APS). This device is for the Intermediate Energy X-ray (IEX) beam line and has been given the title IEX Undulator. The IEX undulator will be able to produce a variety of polarizations: linear vertical, linear horizontal, and right- or left-handed elliptical or circular. Quasi-periodicity can be turned on or off in any mode and the intensity of the quasi-periodicity can be adjusted. The undulator has a 12.5-cm period and can achieve photon energies as low as 250 eV in horizontal polarization and 440 eV in vertical polarization. Below are links to various presentations pertaining to the IEX Undulator.
Conceptual drawing of the full length undulator.
Conceptual drawing of the coils and poles of a short prototype undulator.