Magnetic Design Study of the High-Field Common-Coil Dipole Magnet for High-Energy Accelerators

Abstract

The Institute of High Energy Physics (IHEP, Beijing, China) is proposing a two-stage particle collider: CEPC-SppC. The first stage is a circular electron–positron collider (CEPC), expected to carry out high-precision studies on Higgs bosons. Upon completion of the CEPC experiment, it will be upgraded to a super proton–proton collider (SppC), aiming at the discovery of physics beyond the standard model. The circumference of the accelerator for CEPC and SppC will be 50 $\sim$ 70 km. The required dipole field strength is 20 T for SppC. As the start of a long-term RD the design is based on the current $J_{\rm c}$ level of $\hbox{Nb}_{3}\hbox{Sn}$ and HTS superconductors.