Conceptual Design of a 20 T Hybrid Cos-Theta Dipole Superconducting Magnet for Future High-Energy Particle Accelerators

High energy physics research will need more and more powerful circular accelerators in the next decades. It is therefore desirable to have dipole magnets able to produce the largest possible magnetic field, in order to keep the machine diameter within a reasonable size. A 20 T dipole is considered a desired achievement since it would allow the construction of an 80 km machine, able to circulate 100 TeV proton beams. In order to reach 20 T, a hybrid Low-Temperature Superconductor (LTS) - High-Temperature Superconductor (HTS) magnet is needed, since LTS technology is presently limited to similar to 16 T for accelerator magnet applications. In this paper, we present the design of a 6 layers 20 T hybrid dipole magnet using Nb3Sn (LTS) and Bi2212 (HTS). We show that it is possible to achieve this magnetic field with accelerator field quality, with sufficient margin on a realistic conductor, keeping the stresses within safe limit, avoiding conductor degradation.

Automated summary

High energy physics research requires more powerful circular accelerators in the future. To achieve this, dipole magnets capable of producing a large magnetic field are desired. A 20 T dipole magnet is considered ideal for constructing an 80 km machine that can circulate 100 TeV proton beams. However, current technology limits the use of Low-Temperature Superconductors (LTS) to around 16 T for accelerator magnet applications. This paper presents the design of a 6-layer 20 T hybrid dipole magnet using Nb3Sn (LTS) and Bi2212 (HTS), demonstrating the possibility of achieving the desired magnetic field with sufficient margin on a realistic conductor.