PERFORMANCE OF THE BEPC AND PROGRESS OF THE BEPCII

摘要

The performance of the Beijing Electron-Positron Collider (BEPC) and plans of its second phase construction, i.e. the BEPCII, are reported. The BEPC has been well operated for 15 years with many exciting high energy physics and synchrotron radiation research results since it was put into operation in 1989. As the natural extension of the BEPC, the BEPCII project has started its construction since the beginning of 2004. The design luminosity of the BEPCII is 1x10~(33)cm~(-2)s~(-1) at 1.89 GeV with a double-ring structure. The performance of the BEPCII as a synchrotron radiation source will also be improved with the expected beam current of 250mA at 2.5 GeV. Some key technologies are developed in order to achieve the goal of the project.