Speaker
Description
The Advanced Photon Source (APS) continues to advance short-period superconducting undulator (SCU) technology using NbTi, Nb₃Sn, and 2G-HTS. Recent 16.5-mm-period NbTi SCUs (K ≈ 1.63) incorporate design changes to improve coil-to-ground insulation and enhanced quench protection, enabling training up to 500 A with fewer than fifteen quenches in 1.5-m magnets, ensuring reliable operation at about 430 A. Mechanical shimming reduced RMS phase errors below 5°. Eight new NbTi SCUs are planned for the APS, with two being assembled for installation in May 2026.
The first (λu=18 mm) Nb₃Sn SCU successfully delivered high-energy X-rays for three months, demonstrating suitability for user operations. Building on this, a 14-mm-period, conduction-cooled, cryogen-free Nb₃Sn SCU (K > 2) is under development using a modified cryostat. Short 0.15-m prototypes have been fabricated, are being quench trained in liquid helium, and will be tested in a small helium-free test cryostat before scaling to longer lengths.
In parallel, force-balanced 2G-HTS SCU concepts (K > 1.5) with λu ~10 mm are being explored to achieve higher magnetic fields. This presentation will highlight recent APS SCU developments.
Footnotes
Work supported by U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences, under Contract No. DE-AC02-06CH11357.
Funding Agency
Department of Energy
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