IMPEDANCE OF THE BEPCII ELECTROSTATIC SEPARATORS

摘要

One option to upgrade Beijing Electron Positron Collider (BEPC), namely BEPCII, is to adopt multi-bunch collision in a single ring with a pretzel orbit. Thus 4 horizontal and 2 vertical electrostatic separators are needed. They have large contribution to the impedance budget of the storage ring. In this paper, ways to minimize the impedance of the separators are introduced, and the primary results of 3D modelling are presented.