Beijing Electron–Positron Collider II

The Beijing Electron Positron Collider (Chinese北京 正负 电子 对 撞机, BEPC, since 2005 BEPC -II) is a particle accelerator complex of the Institute of High Energy Physics in the Chinese capital Beijing. The operated from 1988 to 2005 was a BEPC storage ring with a circumference of 240 m, for the simultaneous acceleration of electrons and positrons and their collision with center of mass energies of up to 2 × 2.5 GeV. Between 2004 and 2005 it was rebuilt in the successor BEPC - II, which has two separate storage rings for electrons and positrons with 238 m circumference. He is 1.89 GeV optimized for center of mass energies of 2 × at the collision point where the BES - III experiment is (Beijing Spectrometer). The detector was installed in its third stage of development (hence BES -III) in 2008 at the collision point where the BEPC - II is a 100 -fold higher luminosity than with the previous experiments to be achieved; sought are 1033 cm -2 s -1.

In addition to experiments in particle and nuclear physics at Beijing Spectrometer, the BEPC - II - like its predecessor - used in addition targeted for the production of synchrotron radiation for materials and life sciences. These are 14 of the storage ring outgoing beam lines ( beamline ) is installed, the experiments in three experimental halls of the Beijing Synchrotron Radiation Facility ( BSRF ) supply.