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Description
The Hefei Advanced Light Facility (HALF) project plans to replace two conventional dipole magnets in the storage ring with ReBCO high-temperature superconducting (HTS) bending magnets to enhance the achievable photon energy. ReBCO coated conductors offer high critical fields and strong current-carrying capability, but their large aspect ratio induces significant screening-current effects, resulting in magnetic-field drift and temporal instability. This poses a major challenge for integrating HTS magnets into accelerators. This work employs the H-formulation to model screening-current behavior in the HTS magnet. The effects of various excitation methods and ramp rates on current-density distribution and magnetic-field deviation are investigated. Results indicate that the excitation strategy strongly affects screening-current-induced field drift. These findings provide guidance for selecting coated-conductor tapes and optimizing charging and operating schemes for future HTS bending magnets.
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