Beam-Beam Study in Beijing Electron Positron Collider mini-β Scheme

WANG Sheng; FANG Shou-Xian; ZHANG Chuang

Chinese Physics C> 2001, Vol. 25> Issue(8) : 780-786

Beam-Beam Study in Beijing Electron Positron Collider mini-β Scheme

Institute of High Energy Physics,CAS,Beijing 100039,China

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Abstract：
For performing mini-β scheme in the Beijing Electron-Positron Collider (BEPC),high RF voltage is supplied for shortening the bunch length,but results in the luminosity decrease. This is the special phenomenon of beam-beam on BEPC, which limits the performance of mini-β scheme. The work is aiming to explain the special phenomenon and overcome it. The conclusion of theoretic analysis,simulation and machine study is that,for BEPC,the bunch length influences the beam-beam interaction mainly through the “hourglass”effect and a veraging over the betatron phase during the collision, and these two contrary effects make the luminosity to be maximum only when σ_s/β_y (the ratio of bunch length and beta function of y-direction) is near the optimal value, and so the luminosity decrease due to high RF voltage can be avoided.

References

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WANG Sheng, FANG Shou-Xian and ZHANG Chuang. Beam-Beam Study in Beijing Electron Positron Collider mini-β Scheme[J]. Chinese Physics C, 2001, 25(8): 780-786.

WANG Sheng, FANG Shou-Xian and ZHANG Chuang. Beam-Beam Study in Beijing Electron Positron Collider mini-β Scheme[J]. Chinese Physics C, 2001, 25(8): 780-786. shu

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Received: 2000-07-06
Revised: 1900-01-01

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沈阳化工大学材料科学与工程学院沈阳 110142

Beam-Beam Study in Beijing Electron Positron Collider mini-β Scheme

Corresponding author: WANG Sheng,

Institute of High Energy Physics,CAS,Beijing 100039,China

Received Date: 2000-07-06
Accepted Date: 1900-01-01
Available Online: 2001-08-05

Abstract: For performing mini-β scheme in the Beijing Electron-Positron Collider (BEPC),high RF voltage is supplied for shortening the bunch length,but results in the luminosity decrease. This is the special phenomenon of beam-beam on BEPC, which limits the performance of mini-β scheme. The work is aiming to explain the special phenomenon and overcome it. The conclusion of theoretic analysis,simulation and machine study is that,for BEPC,the bunch length influences the beam-beam interaction mainly through the “hourglass”effect and a veraging over the betatron phase during the collision, and these two contrary effects make the luminosity to be maximum only when σ_s/β_y (the ratio of bunch length and beta function of y-direction) is near the optimal value, and so the luminosity decrease due to high RF voltage can be avoided.