Chinese Physics C > 2007, Vol. 31 > Issue(2): 189-193

Some Studies on Increasing the Luminosity of BEPCⅡ

SUN Yi-Peng^,,
GAO Jie

Institute of High Energy Physics, CAS, Beijing 100049, China2 Key Laboratory of Heavy Ion Physics, Ministry of Education & School of Physics,Peking University, Beijing 100871, China

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Abstract：
BEPCⅡ, the upgrading project of the Beijing Electron-Positron Collider (BEPC), has been designed with a luminosity of 10 ³³cm ^－2.s ^－1at the τ-charm energy region. According to the beam-beam simulation results, the luminosity of BEPCⅡ~with a crossing collision angle of 11mrad is about 0.50×10 ³³cm ^－2.s ^－1with the original operation mode at the working point of 6.53/5.58. To increase the operating luminosity of the BEPCⅡ, a low momentum compaction factor (α _P) collision mode has been studied which can increase the luminosity to 0.54×10 ³³cm ^－2.s ^－1. If the bunch length of the low α _Pmode is reduced from 1.5cm to 1.2cm, a mode with vertical beta function at IP equal to 1.2cm could push the luminosity to 0.828×10 ³³cm ^－2.s ^－1at the working points 6.53/5.56.

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SUN Yi-Peng and GAO Jie. Some Studies on Increasing the Luminosity of BEPCⅡ[J]. Chinese Physics C, 2007, 31(2): 189-193.

SUN Yi-Peng and GAO Jie. Some Studies on Increasing the Luminosity of BEPCⅡ[J]. Chinese Physics C, 2007, 31(2): 189-193. shu

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Received: 2006-06-21
Revised: 2006-07-14

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沈阳化工大学材料科学与工程学院沈阳 110142

Some Studies on Increasing the Luminosity of BEPCⅡ

SUN Yi-Peng^,
GAO Jie

Corresponding author:SUN Yi-Peng,

Institute of High Energy Physics, CAS, Beijing 100049, China2 Key Laboratory of Heavy Ion Physics, Ministry of Education & School of Physics,Peking University, Beijing 100871, China

Received Date:2006-06-21
Accepted Date:2006-07-14
Available Online:2007-02-05

Abstract:BEPCⅡ, the upgrading project of the Beijing Electron-Positron Collider (BEPC), has been designed with a luminosity of 10³³cm^－2.s^－1at the τ-charm energy region. According to the beam-beam simulation results, the luminosity of BEPCⅡ~with a crossing collision angle of 11mrad is about 0.50×10³³cm^－2.s^－1with the original operation mode at the working point of 6.53/5.58. To increase the operating luminosity of the BEPCⅡ, a low momentum compaction factor (α_P) collision mode has been studied which can increase the luminosity to 0.54×10³³cm^－2.s^－1. If the bunch length of the low α_Pmode is reduced from 1.5cm to 1.2cm, a mode with vertical beta function at IP equal to 1.2cm could push the luminosity to 0.828×10³³cm^－2.s^－1at the working points 6.53/5.56.