Conceptual Design of a 3 T HTS Solenoid for Future Circular Collider Particle Detectors

The design activity described in this paper concerns the development of a new superconducting solenoid for particle collider detector magnets based on high-temperature superconductor technology. Developed by the Istituto Nazionale di Fisica Nucleare (INFN) Laboratorio di Acceleratori e Superconduttività Applicata (LASA), in the framework of the Innovative Detector for e-e+ Accelerator (IDEA) proposal for the Future Circular Collider project in the electron positron configuration (FCC-ee), the new superconducting solenoid design aims to reach a nominal field up to 3 T. By considering to use aluminum stabilized High-Temperature Superconductor (HTS) REBCO cables, this innovative design features an increased bore radius to accommodate enhanced dual-readout crystal calorimeters with the possibility to work at an operating temperature of 20 K. The proposed configuration has the potential to significantly reduce cryogenic power consumption, thereby improving overall accelerator sustainability while increasing the operating margin of the superconducting winding. In this paper, the electromagnetic performances and a preliminary mechanical analysis of the proposed HTS design are discussed. Details of the protection feasibility are provided together with transparency calculations of the coil volume showing the advantages of the proposed HTS configuration as an important step towards increased performances and enhanced energy efficiency of future particle detector magnets for lepton collider experiments.