ON THE AVERAGE LUMINOSITY OF ELECTRON POSITRON COLLIDER AND POSITRON-PRODUING ENERGY

XIE Jia-Lin

Chinese Physics C> 1985, Vol. 9> Issue(5) : 577-585

ON THE AVERAGE LUMINOSITY OF ELECTRON POSITRON COLLIDER AND POSITRON-PRODUING ENERGY

XIE Jia-Lin ^,

Institute of High Energy Physics, Academia Sinica

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In this paper, the average luminosity of linac injected electron positron collider is investigated from the positron-producing energy point of view. When the energy of the linac injector is fixed to be less than the operating energy of the storage ring, it has been found that there exists a positron-producing energy to give optimum average luminosity. Two cases have been studied, one for an ideal storage ring with no single-beam instability and the other for practical storage ring with fast head-tail instability. The result indicates that there is a positron-producing energy corresponding to the minimum injection time, but this does not correspond to the optimum average luminosity for the practical storage rings. For Beijing Electron Positron Collider (BEPC), the positron-producing energy corresponding to the optimum average luminosity is about one tenth of the total injector energy.

References

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T. Nishikawa and G. Horikoshi, "Status of KEK Tristan Project" Proc. 1983 Particle Accelerator Conf. Santa Fe, P. 1983.[2] R. Chehab etc., "An Adiabatic Matching Device for the Orsay Linear Positron Accelerator:,Proc. 1983 Particle Accelerator Conf. Santa Fe, P. 2850.[3] M. Sands, "The Physics of Electron Storage Rings" SLAGRPT 121 (1970).[4] LEP Study Group'.'Design Study of a 1-100 GeV e+e- colliding Beam Machine" CERN/ISR-LEP/78-17 (1978).[5] 方守贤, 国智元, “平均亮度与注人时间之关系”BEPC/THC1982).[6] M. B. James etc., Xth International Conf. On High Energy Accelerator, Serpukhov, U. S. S. R.July 11-17, 1977.[7] 周迷, EGS释序计茸不申.子产生, 私人涌信(1983).[8] BEPG设计组, 2.2/2:8亿电子伏北京正负电子对撞机初步设计提要(1982).[9] P. B. Wilson, private communication (1982).[10] K. Satoh and Y. Chin "Transverse Mode Coupling in a Bunched Beam", Nucl. Instr. Meth. 207(1983), 309.[11] Spear Group, "Spear 11 Performance" SL-4C-PUB1562 (1975)[12] G. Stange, "An Inexpensive Positron Converter of High Reliability And High Yield" Proc. 1979 Particle Accelerator Conf. IEEE NS-26, No. 3. p. 4146.

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[5]	WANG Sheng , FANG Shou-Xian , ZHANG Chuang . Beam-Beam Study in Beijing Electron Positron Collider mini-β Scheme. Chinese Physics C, 2001, 25(8): 780-786.
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[8]	Li Yun , Wang Guangwei . Research of Bunch Lengthening of BEPC Ring by Many-Particle Simulation. Chinese Physics C, 1996, 20(10): 950-956.
[9]	Zhao Jijiu , Geng Xiaosong , Yu Yulan , Wang Bingfeng , Wang Chunhong , Xu Jingwei , Liu Wei , Luo Huiying , Wang Yaru , Lu Jihua , Yan Yonghe , Zhan Mingchuan , Wang Youheng . Upgrading at the BEPC Control System. Chinese Physics C, 1996, 20(8): 756-762.
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[16]	LIU Nian-Zong , ZHANG Cai-Di , ZHENG Lin-Sheng , HU Li-Dong , ZHAO Xiao-Jian , ZHONG Xue-Chu , DENG Hu , ZHU Shan-Gen , ZHANG Ge , ZHANG Zhu-Xiang , ZHANG Liang-Sheng , ZHOU Yong-Shen , XU Jian-Guo , TAN Yi-Ping , HAN Shu-Rong , HAN Ying , BAO Xiu-Min . The Test Beam on BEPC and Physics Works on It. Chinese Physics C, 1992, 16(11): 965-977.
[17]	BES Collaboration . τ Mass Measurement at Beijing Electron Positron Collider (BEPC). Chinese Physics C, 1992, 16(10): 865-875.
[18]	LI Jin , MAO Ze-Pu . The Measurement of Bunch Length of Beijing Electron Positron Collider. Chinese Physics C, 1991, 15(5): 385-390.
[19]	CAO Zhong , LIU Wei-Ren , WANG Li-Lie , XIE Shi-Liang , JIANG Li-Ping , DING Mei-Song , ZHAO Ji-Lai , REN You-Lai , SHAN Bing , ZHAO Zheng , CUI Ming-Qi . SHAPE MEASUREMENT OF SYNCHROTRON RADIATION WITH HIGH TIME RESOLUTION. Chinese Physics C, 1990, 14(8): 677-683.
[20]	PEI Guo-Xi , XIE Jia-Lin , ZHOU Shu , SUN Song-Lan . OPTIMIZATION OF BEPC POSITRON SOURCE. Chinese Physics C, 1990, 14(2): 110-117.

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XIE Jia-Lin. ON THE AVERAGE LUMINOSITY OF ELECTRON POSITRON COLLIDER AND POSITRON-PRODUING ENERGY[J]. Chinese Physics C, 1985, 9(5): 577-585.

XIE Jia-Lin. ON THE AVERAGE LUMINOSITY OF ELECTRON POSITRON COLLIDER AND POSITRON-PRODUING ENERGY[J]. Chinese Physics C, 1985, 9(5): 577-585. shu

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Received: 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

ON THE AVERAGE LUMINOSITY OF ELECTRON POSITRON COLLIDER AND POSITRON-PRODUING ENERGY

Corresponding author: XIE Jia-Lin,

Institute of High Energy Physics, Academia Sinica

Received Date: 1900-01-01

Accepted Date: 1900-01-01

Available Online: 1985-10-05

Abstract: In this paper, the average luminosity of linac injected electron positron collider is investigated from the positron-producing energy point of view. When the energy of the linac injector is fixed to be less than the operating energy of the storage ring, it has been found that there exists a positron-producing energy to give optimum average luminosity. Two cases have been studied, one for an ideal storage ring with no single-beam instability and the other for practical storage ring with fast head-tail instability. The result indicates that there is a positron-producing energy corresponding to the minimum injection time, but this does not correspond to the optimum average luminosity for the practical storage rings. For Beijing Electron Positron Collider (BEPC), the positron-producing energy corresponding to the optimum average luminosity is about one tenth of the total injector energy.

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ON THE AVERAGE LUMINOSITY OF ELECTRON POSITRON COLLIDER AND POSITRON-PRODUING ENERGY

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