Speaker
Description
The European Synchrotron Radiation Facility (ESRF) is developing a compact high-temperature superconducting (HTS) wiggler for beamline BM18, consisting of three pole pairs delivering up to 1.58 T, with variable field capability within a minimal footprint. ReBCO HTS tapes enable high current densities and allow current-controlled field scans, eliminating bulky mechanical phase shifters.
The magnet comprises racetrack coils and an iron yoke optimized with COMSOL and RADIA to satisfy field specifications at 65 K. A no-insulation winding technique enhances robustness against quenches. Numerical optimization minimizes the first and second field integrals over the operating current range.
Prototype development is advancing: winding tests at 77 K have started, providing initial measurements of magnetic field intensity and homogeneity, inter-turn resistance, and mechanical response of the winding. These results provide crucial information for the completion of the remaining coils, upcoming cold tests, and the validation of the design for synchrotron operations.
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