BEPC II: construction and commissioning

摘要

This is a status report of the project on befalf of the BEPC II team. BEPC II is a major upgrade of the BEPC (Beijing Electron-Positron Collider). It is a double-ring e+-e- collider as well as a synchrotron radiation (SR) source with its outer ring, or SR ring. As a collider, BEPC II operates in the beam energy region of 1-2.3 GeV with design luminosity of 1×1033 cm-2s-1 at 1.89 GeV. As a light source, the SR ring operates at 2.5 GeV and 250 mA. Construction of the project started in the beginning of 2004. Installation of the storage ring components was completed in October 2007. Commissioning is in progress. There are still many issues for further studies before reach to 3×1032 cm-2s-1.