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Description
Modern synchrotron light sources employ various types of undulators to generate highly coherent and well collimated X-rays. A large and homogeneous magnetic field around the beam axis is typically the preferred configuration, since it simplifies both alignment and operation. Nevertheless, a nonhomogeneous field, such as that of a transverse gradient undulator (TGU), offers attractive possibilities for advanced operating modes, for example enabling large bandwidth operation in a free electron laser. In this contribution, we present the first beam-based characterization of such a TGU for various magnetic field gradients and X-ray polarization settings, and we compare the experimental results with corresponding simulation data. The measurements were carried out at Athos, the soft x-ray beamline of SwissFEL. This line employs Apple X undulators, whose independent radial and shift motion of all four magnetic arrays makes them uniquely capable of generating the required transverse gradients.
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