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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K.Steffen,Internal Report DESY M-79123,May1979.[2] H.Nesemann et al.,IEEE Irans.onNSNS-30（1983）1998.[3] K.Wille,DORISII/III-A 5.8 Gev Storage Ring with High Luminosity,DESY 81-047Aug.1981.[4] K.Bane et al.,Bunch Length and Impedance Measure mentsin SPEAR,European ParticleAcc.Conf.,P878,Rome,June7-11,1988.[5] 吴英志，BEPC储存环Mini-β磁聚焦结构初步设计，BEPC理论组内部工作报告，83,07.[6] 洪澎，BEPC Mini-β方案的设计和研究，硕士学位论文，高能物理研究所，1987年5月。[7] 国智元等，BEPC亮度预先研究，高能所理论组内部报告，BEPC 17H186-6,1986.[8] Wu Yingzhi et al.,Aproposed Mini-β Scheme for BEPC,Prce.of the Workshop on BEPC,Lumlnosity Upgrades,June1991.[9] 方守贤等，高能物理与核物理，10（1986）207.[10] 李光晓，BEPCMini-β Lattice方案设计及纵向微波不稳定性的初步研究，博士论文，高能物理所，1993年7月。[11] 秦庆，BEPC中束-束相互作用的研究，硕士论文，高能物理所，1991年。[12] S.Myers.Nucl.Znstr.Meth.,211（1983）263.

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

Li Guangxiao ^,
Fang Shouxian

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.