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Stable user operation of the Transverse Resonant Island Bucket (TRIBs) mode at BESSY II allows us to begin in earnest the design of undulators to exploit this mode for MHz switching rates. This has previously been demonstrated at BESSY II, where two modules of the undulator used for the demonstration were arranged sequentially in the straight. Two inherent drawbacks of this proof-of-principle arrangement were a longitudinal separation of the source points in the two modules of the undulator and the non-ideal transverse displacement of the source points of the X-ray optics.
This paper builds on suggestions for possible undulator designs and describes possible approaches that would provide two foci at the sample, laying on top of each other: specifically where the two source points are either offset in space transversally (x), or offset in angle transversally (x’). These undulator and beamline designs are considered and discussed for their feasibility to construct, for the ease of superposition of the two helicity flipped photon beams, and their otherwise equal properties at the experiments.
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