JACoW is a publisher in Geneva, Switzerland that publishes the proceedings of accelerator conferences held around the world by an international collaboration of editors.
TY - UNPB AU - Ma, Y. ED - Biagini, Maria Enrica ED - Chrin, Jan ED - Giabbai, Manuela ED - Iungo, Massimiliano ED - Schaa, Volker R.W. TI - CEPC Vacuum System J2 - Proc. of eeFACT2022, Frascati, Italy, 12-16 September 2022 CY - Frascati, Italy T2 - ICFA Advanced Beam Dynamics Workshop on High Luminosity Circular e+e- Colliders T3 - 65 LA - english AB - CEPC have the biggest vacuum system in the word, so as to the FCC-ee. Its includes 100 km electron ring, positron ring, booster ring and the 1.2km linac. As the W, Z, tt mode has been proposed in TDR, the demands of vacuum system have been considered. Due to the difference of beam energy and current, the PSD of W, Z, tt mode has been changed comparing to Higgs mode, which shows that the photon-stimulated desorption gas load is very high. Similar to positron ring, NEG coating is proposed to vacuum chamber of electron storage ring to absorb extra gas load. To eliminate the quadrupolar wakes, elliptical vacuum chamber in the collider ring will be replaced by circular chambers with dimeter of 56 mm. PB - JACoW Publishing CP - Geneva, Switzerland ER -