Design of superconducting bending magnets and an integral compensation method for the Hefei Advanced Light Facility

Hefei Advanced Light Facility (HALF) is a fourth-generation synchrotron radiation source under construction, with a beam energy of 2.2 GeV and a radiation spectrum primarily covering the VUV to soft X-ray range. To extend its photon energy into the hard X-ray regime, HALF plans to replace two normal-conducting bending magnets with 6 T superconducting bending magnets (Superbends). This paper presents two Superbend electromagnetic schemes to address the challenge of achieving high peak magnetic fields within a limited magnetic field integral. To resolve the integral field mismatch between the Superbends and the original bending magnets, an integral compensation method is proposed as a potential solution for Scheme 1. Additionally, the impact of both schemes on the storage ring beam dynamics is analyzed, and the lattice is optimized to preserve the original performance. To further assess the engineering feasibility of Scheme 1, mechanical and cryogenic system designs are carried out. A preliminary quench protection strategy is also proposed to ensure the safe operation of the ReBCO coils.