Booster Free From Spin Resonance For Future 100~km-scale Circular e${}^{+}$e${}^{-}$ Colliders

Tao Chen, Zhe Duan, Daheng Ji +1

Acceleration of polarized electron~(positron) beams in a booster synchrotron may suffer from depolarization due to crossings of many spin depolarization resonances, which could lim…