The UE46 PGM-1 undulator beamline at the BESSY II storage ring provides soft x-rays of tunable polarization, linear and circular. With two permanent endstations, a versatile XUV diffractometer and a 7-Tesla High-Field diffractometer, the setup is dedicated to both, resonant spectroscopy and scattering/diffraction.
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Weschke et al. (2018) studied this question.