Circular polarization measurements at the BESSY crossed field undulator

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Abstract
The crossed field undulator independently proposed by Moiseev et al. and K. J. Kim generates short wavelength (photon energy above 35 eV) circularly polarized radiation. It is based on the coherent superposition of two mutually orthogonally polarized wavetrains generated in two `ordinary' undulators arranged one after the other along with electron beam axis. The superposition is achieved in a monochromator of sufficient spectral resolution. The relative phase is determined by the so called modulator located in between the two undulators. It is a three pole magnetic structure returning the electrons to the axis with a time delay with respect to the straight path of the order of an optical period.

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