Realizability of the Permanent Magnet Mini-β Scheme for the Beijing Electron Positron Collider

Li Guangxiao; Fang Shouxian

Chinese Physics C> 1995, Vol. 19> Issue(10) : 952-958

Realizability of the Permanent Magnet Mini-β Scheme for the Beijing Electron Positron Collider

Li Guangxiao ^, ,
Fang Shouxian

Institute of High Energy Physics, The Chinese Academy ot Sciences, Beijing 100039

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Abstract：
The design principle and main parameters of the permanent magnet Mini-βscheme for the Beijing Electron Positron Collider (BEPC) are described.In the design,the BEPC storage ring will have a Mini-β insertion and a conventional insertion in the southern and northern interaction regions respectively.The arc and injection regions are kept unchanged. The Mini-β insertion quadrupoles are designed to be permanent magnets.A vertical focusing electromagnet is positioned near each of the two gates of BES so that the dynamics perturbation due to the constant field strength of the permanent magnet in the energy ramping can be compensated. The designed βx*=1.2m, βy* = 0.036m,and the length and strength of the permanent magnets are 0.5m and 8T/m respectively.Compared with running mode now,the designed luminosity is incresed by a factor of about 3.

References

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[4]	GUO Zhi-Yuan , QIN Qing , ZHANG Chuang , MA Li . Study on Beam Photoelectron Instability in BEPC. Chinese Physics C, 2001, 25(3): 251-257.
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Li Guangxiao and Fang Shouxian. Realizability of the Permanent Magnet Mini-β Scheme for the Beijing Electron Positron Collider[J]. Chinese Physics C, 1995, 19(10): 952-958.

Li Guangxiao and Fang Shouxian. Realizability of the Permanent Magnet Mini-β Scheme for the Beijing Electron Positron Collider[J]. Chinese Physics C, 1995, 19(10): 952-958. shu

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Received: 1900-01-01
Revised: 1900-01-01

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通讯作者: 陈斌, bchen63@163.com

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沈阳化工大学材料科学与工程学院沈阳 110142

Realizability of the Permanent Magnet Mini-β Scheme for the Beijing Electron Positron Collider

Corresponding author: Li Guangxiao,

Institute of High Energy Physics, The Chinese Academy ot Sciences, Beijing 100039

Received Date: 1900-01-01

Accepted Date: 1900-01-01

Available Online: 1995-10-05

Abstract: The design principle and main parameters of the permanent magnet Mini-βscheme for the Beijing Electron Positron Collider (BEPC) are described.In the design,the BEPC storage ring will have a Mini-β insertion and a conventional insertion in the southern and northern interaction regions respectively.The arc and injection regions are kept unchanged. The Mini-β insertion quadrupoles are designed to be permanent magnets.A vertical focusing electromagnet is positioned near each of the two gates of BES so that the dynamics perturbation due to the constant field strength of the permanent magnet in the energy ramping can be compensated. The designed βx*=1.2m, βy* = 0.036m,and the length and strength of the permanent magnets are 0.5m and 8T/m respectively.Compared with running mode now,the designed luminosity is incresed by a factor of about 3.

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Realizability of the Permanent Magnet Mini-β Scheme for the Beijing Electron Positron Collider

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