Speaker
Description
To provide fully controllable elliptical polarisation to all experimental stations of the SwissFEL facility, spanning soft to hard x-rays, the PSI ID group is developing a novel undulator concept based on HTS REBCO tapes. The proposed design enables the superposition of right-handed and left-handed helical fields with comparable strength, allowing the generation of horizontal and vertical linear polarisation with similar field amplitudes and continuous tuning across all elliptical states. Owing to the compactness of the concept, polarisation rotation could also be achieved through a physical rotation of the coil assembly or its cryostat.
This presentation will introduce the new winding scheme and the underlying REBCO tape technology, and will summarise the expected magnetic field performance for parameter sets relevant to future SwissFEL upgrades. Particular emphasis will be placed on the remaining challenges and the substantial R&D effort required to establish this approach as a robust undulator technology, including issues related to persistent currents, quench protection, and automated winding processes.
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