Summary
This technical report documents ongoing developments of short-period superconducting undulators at the Advanced Photon Source, focusing on three superconducting materials and their engineering optimisations. Key advances include enhanced insulation and quench protection in NbTi magnets achieving reliable operation at 500 A, magnetic gap tuning achieving sub-5° phase error, and progress toward both higher-field Nb₃Sn and liquid helium-free 2G-HTS designs. These developments aim to improve the performance and operational reliability of synchrotron radiation sources.
UK applicability
This work is primarily relevant to facilities operating synchrotron radiation sources, such as Diamond Light Source in the UK. The superconducting undulator technologies and engineering solutions developed at APS may inform design and optimisation of similar systems at UK synchrotron facilities, though direct applicability depends on specific facility requirements and magnet specifications.
Key measures
Quench current (500 A), number of quenches to training (~15), RMS phase error (<5°), magnetic gap adjustment, cryostat performance
Outcomes reported
The study reports developments in short-period superconducting undulators using three superconducting materials (NbTi, Nb₃Sn, and 2G-HTS), including enhanced magnet designs, quench protection systems, and magnetic gap adjustment techniques. Performance metrics include reliable quench training up to 500 A, RMS phase errors less than 5°, and progress toward liquid helium-free cryostat designs.
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