Design, commissioning and luminosity upgrade of the BEPC-II storage rings

Aula Bruno Touschek (Laboratori Nazionali di Frascati, Via Enrico Fermi 40, Frascati)

Aula Bruno Touschek

Laboratori Nazionali di Frascati, Via Enrico Fermi 40, Frascati

Via Enrico Fermi 40 00044 Frascati

As the major upgrade of the BEPC (Beijing Electron Positron Collider), BEPC-II aims on working at the tau-charm energy with a double ring e+-e− factory-like collider, and providing partially dedicated synchrotron radiation (SR) light to users as well. As a collider, the commissioning of the BEPC-II started from Nov. 2006, and got to the luminosity of 3×1032cm-2s-1 at 1.89 GeV in May 2009. A lot of accelerator physics problems, such as optics realization, impedance problem, detector background, beam lifetimie, luminosity optimization, etc., are met during the commissioning of the storage rings. As a light source, the SR ring of the BEPC-II was also commissioned and delivered beams to users at 2.5 GeV and 250 mA for more than 5 months during the year of 2007 to 2009. Some future plans for higher luminosity are proposed and being studied. In this talk, the main design work of the BEPC-II storage rings, accelerator physics issues in the luminosity commissioning and performance for HEP and SR users, and possible future proposals, are discussed in detail.

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