First Experimental Demonstration of Period Length Switching for Superconducting Insertion Devices
Superconducting insertion devices (IDs) are very at- tractiveforsynchrotronlightsourcessincetheyofferthepossibility to enhance the tuning range and functionality significantly by pe- riod length switching. Period length switching can be achieved by employing two or more individually powerable subsets of super- conducting coils and reverse the current in a part of the windings. In this contribution we report the first experimental test of this principle demonstratedona 70mm NbTi mock-up coil withperiod tripling, allowing to switch between a 15 mm period length undu- lator and a 45 mm wiggler (SCUW 15/45). Index Terms—Insertion devices, mock-up magnets, period switching, superconducting coils, undulators.