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Installation and commissioning of electron linac completed in BEPCII

Dec 20, 2004

 

Important progress has been made in the installation and commissioning of the equipment for the first phased BEPC II project. At 16:41, Nov. 19, 2004 the signal of an electron beam at the exit of the electron linac was clearly observed on the oscilloscope of the linac control room. According to calculation, the intensity is over 2 A. The obtainment of this signal marks an important phased result obtained in upgrading the BEPC-II linac.

Located at the CAS Institute of High Energy Physics in Beijing, Beijing Electron Positron Collider (BEPC) consists of an injector, a storage ring, a transportation line, the Beijing Spectrometer (BES), the Beijing Synchrotron Radiation Facility (BSRF) and a computer center. Since its operation in October 1990 as a flagship project in China's basic research, a series of world-class physics results have been achieved. Its achievement in the study of tau charm physics, for instance, enables the country to have a niche in the world community of high energy physics. Its recently measurement of R value in 2 - 5 GeV region is considered a breakthrough in the field.

Upon the approval of the Chinese government, a major renovation of BEPC, known as BEPCII, has already been under way. With a total budget of 640 million Chinese yuan (77 million US dollars), CAS scientists will carry out a thorough upgrade of the collider and its detectors by adopting the state-of-the-art double-ring alternating colliding technology. After its completion before 2008, according to scientists, its luminosity will be hiked by two orders of magnitude, reaching 3x10³²/cm²s in the energy zone of 3.77 GeV.

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