Beijing Electron Positron Collider

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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 BEPC operated from 1988 to 2005 was a storage ring with a circumference of 240 m, for the simultaneous acceleration of electrons and positrons and their collision with center of gravity energies of up to 2 × 2.5  GeV . Between 2004 and 2005 it was converted into the successor BEPC-II, which has two separate storage rings for electrons and positrons with a circumference of 238 m. It is optimized for center of gravity energies of 2 × 1.89 GeV at the collision point where the BES-III experiment is located (Beijing Spectrometer) . The detector was installed in its third expansion stage (hence BES-III) in 2008 at the collision point, where a 100 times higher luminosity is to be achieved with the BEPC-II than with the previous experiments; the aim is 10 33  cm −2  s −1 .

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

Web links

  • BEPC & BEPCII , Institute of High Energy Physics (Chinese Academy of Sciences), see under Facilities: Double Storage Ring (BEPCII)
  • BESIII experiment

literature

Individual evidence

  1. ↑ Shou-Xian Fang, Sen-Yu Chen: The Beijing Electron Positron Collider. (PDF; 1.2 MB) In: Particle Accelerators. Vol. 25, 1990, pp. 51-61.
  2. ^ A b Frederick A. Harris: BEPCII and BESIII. (PDF; 533 kB) In: Int. J. Mod. Phys. A. Vol. 24, No. 2-3, 2009, pp. 377-384, doi : 10.1142 / S0217751X09043705
  3. ^ A b C. Zhang, JQ Wang: The Beijing Electron-positron Collider and its Second Phase Construction. (PDF; 267 kB) In: Proc. of EPAC 2004. Lucerne, Switzerland, 5. – 9. July 2004, pp. 230-232.
  4. ↑ Brief Introduction of BSRF. Beijing Synchrotron Radiation Facility (BSRF), accessed October 20, 2013.