Performance upgrade in the JAEA actinide science beamline BL23SU at SPring-8 with a new twin-helical undulator

The soft X-ray beamline BL23SU at SPring-8 has undergone an upgrade with a twin-helical undulator of in-vacuum type to enhance the experimental capabilities of the endstations. The new light source with a fast helicity-switching operation allows not only the data throughput but also the sensitivity in X-ray magnetic circular dichroism (XMCD) to be improved. The operational performance and potential are described by presenting XMCD results of paramagnetic beta-US2 measured with a 10 T superconducting magnet.