Physics design of collimators to reduce lost particle background at the CEPC

Teng Yue; Qing-Lei Xiu; Yi-Wei Wang; Zhe Duan; Qing Qin

doi:10.1088/1674-1137/40/11/117001

Chinese Physics C> 2016, Vol. 40> Issue(11) : 117001 DOI: 10.1088/1674-1137/40/11/117001

Physics design of collimators to reduce lost particle background at the CEPC

1.
Key Laboratory of Particle Acceleration Physics and Technology, Institute of High Energy Physics, CAS, Beijing 100049, China

Abstract
HTML
Reference
Related

PDF

Abstract：
At the CEPC (Circular Electron Positron Collider), which is proposed by the Chinese high energy physics community, the dominant background comes from radiative Bhabha scattering and the beamstrahlung effect according to preliminary research. Therefore, it is necessary to incorporate a collimator system to intercept particles that may be lost near the interaction region (IR). In this paper, we introduce some limitations in choosing the position and width of the collimators. A certain parameter range is determined which is confined by the β function and the width of the collimators. A suitable choice of the half width is made by exploring this parameter range. A simulation of the particle loss rate in the IR and the hit density in the vertex detector with and without the collimators shows that the set of parameters of the collimators we designed is appropriate and effective.
- CEPC ,
- lost particle background ,
- collimator

References

[1]	ATLAS Collaboration, Phys. Lett. B, 716: 1-29, 2012
[2]	CMS Collaboration, Phys. Lett. B, 716: 30-61, 2012
[3]	https://fcc.web.cern.ch/Pages
[4]	The CEPC-SPPC Study Group, CEPC-SPPC Preliminary Conceptual Design Report, Volume II-Accelerator
[5]	T. Yue, Q. Qin, Study of Background and MDI Design for CEPC.in Proceedings of the Seventh International Particle Accelerator Conference, (Richmond, America, 2015)
[6]	A. W. Chao, M. Tigner, Handbook of Accelerator physics and engineering, (3rd Printing), p 136
[7]	A. M. Toader, R. Barlow Comparison of Collimator Wakefields Formulae, in Proceedings of 11th European Particle Accelerator Conference (Genoa, Italy, 2008)
[8]	G. V. Stupakov High-Frequency Impedance of Small-Angle Collimators in Proceedings of the 2001 Particles Accelerator Conference (Chicage, America)
[9]	Y. W. Wang, X. H. Cui, J. Gao, IHEP preprint, IHEP-AC-LC-Note2015-015
[10]	R. Kleiss, H. Burkhardt, CERN preprint, CERN-SL-94-03(OP)
[11]	V. I. Telnov Phys. Rev. Letters, 110: 114801(2013)
[12]	A. Bogomyagkov, E. Levichev, and D. Shatilov Phys. Rev. ST Accel. Beams, 17: 041004(2014)
[13]	GEANT4 Collaboration, Nucl. Instrum. Methods A, 506 (2003)

[1]	Fangyi Guo , Yaquan Fang , Gang Li , Xinchou Lou . Expected measurement precision of the branching ratio of the Higgs boson decaying to the di-photon at the CEPC. Chinese Physics C, 2023, 47(4): 043002. doi: 10.1088/1674-1137/acaa22
[2]	Yu Bai , Chun-Hui Chen , Ya-Quan Fang , Gang Li , Man-Qi Ruan , Jing-Yuan Shi , Bo Wang , Pan-Yu Kong , Bo-Yang Lan , Zhan-Feng Liu . Measurements of decay branching fractions of ${{H \to b\bar b/c\bar c/gg}}$ in associated ${{(e^ + e^ - /\mu ^ +\mu ^- )H}}$ production at the CEPC. Chinese Physics C, 2020, 44(1): 013001. doi: 10.1088/1674-1137/44/1/013001
[3]	Yuhang Tan , Xin Shi , Ryuta Kiuchi , Manqi Ruan , Maoqiang Jing , Dan Yu , Kaili Zhang , Xinchou Lou , Xin Mo , Gang Li , Susmita Jyotishmati . Search for invisible decays of the Higgs boson produced at the CEPC. Chinese Physics C, 2020, 44(12): 123001. doi: 10.1088/1674-1137/abb4d8
[4]	Yu-Dong Wang , Jian-Xiong Wang . Angular distribution coefficients of Z (W) boson produced in ${{e^+e^-}} $ collisions at ${{\sqrt{s}=240}} $ GeV. Chinese Physics C, 2019, 43(4): 043102. doi: 10.1088/1674-1137/43/4/043102
[5]	Wen Chen;Feng Feng;Yu Jia;Wen-Long Sang . Mixed electroweak-QCD corrections to ${e^+e^-\to \mu^+\mu^- H}$ at CEPC with finite-width effect. Chinese Physics C, 2019, df87c41e-622f-49a7-b081-5c584df157aa(11): 13108-.
[6]	Wen Chen , Feng Feng , Yu Jia , Wen-Long Sang . Mixed electroweak-QCD corrections to e⁺e^-→μ⁺μ^-H at CEPC with finite-width effect. Chinese Physics C, 2019, 43(1): 013108. doi: 10.1088/1674-1137/43/1/013108
[7]	Hang Zhao , Yong-Feng Zhu , Cheng-Dong Fu , Dan Yu , Man-Qi Ruan . The Higgs signatures at the CEPC CDR baseline. Chinese Physics C, 2019, 43(2): 023001. doi: 10.1088/1674-1137/43/2/023001
[8]	Juan-Juan Niu , Lei Guo , Shao-Ming Wang . HZ associated production with decay in the Alternative Left-Right Model at CEPC and future linear colliders. Chinese Physics C, 2018, 42(9): 093107. doi: 10.1088/1674-1137/42/9/093107
[9]	Jiayin Gu , Ying-Ying Li . Optimizing Higgs factories by modifying the recoil mass. Chinese Physics C, 2018, 42(3): 033102. doi: 10.1088/1674-1137/42/3/033102
[10]	Wei-Guo Chen , Xia Wan , You-Kai Wang . An optimal scheme for top quark mass measurement near the tt threshold at future e⁺e^- colliders. Chinese Physics C, 2018, 42(5): 053002. doi: 10.1088/1674-1137/42/5/053002
[11]	Andrea Addazi , Xian-Wei Kang , Maxim Yu. Khlopov . Testing B-violating signatures from exotic instantons in future colliders. Chinese Physics C, 2017, 41(9): 093102. doi: 10.1088/1674-1137/41/9/093102
[12]	Zhen-Xing Chen , Ying Yang , Man-Qi Ruan , Da-Yong Wang , Gang Li , Shan Jin , Yong Ban . Cross section and Higgs mass measurement with Higgsstrahlung at the CEPC. Chinese Physics C, 2017, 41(2): 023003. doi: 10.1088/1674-1137/41/2/023003
[13]	Guang-Zhi Xu , Gang Li , Yi-Jie Li , Kui-Yong Liu , Yu-Jie Zhang . Interference effects on Higgs mass measurement in e⁺e^-→H(γγ)Z at CEPC. Chinese Physics C, 2016, 40(3): 033101. doi: 10.1088/1674-1137/40/3/033101
[14]	Ming Xiao , Jie Gao , Dou Wang , Feng Su , Yi-Wei Wang , Sha Bai , Tian-Jian Bian . Study of CEPC performance with different collision energies and geometric layouts. Chinese Physics C, 2016, 40(8): 087001. doi: 10.1088/1674-1137/40/8/087001
[15]	Hai-Bo Xu , Na Zheng . Optimum angle-cut of collimator for dense objects in high-energy proton radiography. Chinese Physics C, 2016, 40(2): 028201. doi: 10.1088/1674-1137/40/2/028201
[16]	Jian-Bo Gao , Yun-Tao Liu , Dong-Feng Chen . A new method for analyzing the collimation angleof a neutron Soller collimator. Chinese Physics C, 2016, 40(1): 016003. doi: 10.1088/1674-1137/40/1/016003
[17]	Xin Mo , Gang Li , Man-Qi Ruan , Xin-Chou Lou . Physics cross sections and event generation of e⁺e^- annihilations at the CEPC. Chinese Physics C, 2016, 40(3): 033001. doi: 10.1088/1674-1137/40/3/033001
[18]	Hong-Juan Zheng , Jie Gao , Zhen-Chao Liu . Cavity and HOM coupler design for CEPC. Chinese Physics C, 2016, 40(5): 057001. doi: 10.1088/1674-1137/40/5/057001
[19]	YANG Xiao-Peng , YU Bo-Xiang , LI Yi-Guo , PENG Dan , LU Jin , ZHANG Gao-Long , ZHAO Hang , ZHANG Ai-Wu , LI Chun-Yang , LIU Wan-Jin , HU Tao , . Neutron collimator design of neutron radiography basedon the BNCT facility. Chinese Physics C, 2014, 38(2): 028201. doi: 10.1088/1674-1137/38/2/028201
[20]	ZOU Yi-Qing , WANG Na , KANG Ling , QU Hua-Min , HE Zhe-Xi , YU Jie-Bing . Thermal analysis and cooling structure design of the primary collimator in CSNS/RCS. Chinese Physics C, 2013, 37(5): 057004. doi: 10.1088/1674-1137/37/5/057004

Access

Get Citation

Teng Yue, Qing-Lei Xiu, Yi-Wei Wang, Zhe Duan and Qing Qin. Physics design of collimators to reduce lost particle background at the CEPC[J]. Chinese Physics C, 2016, 40(11): 117001. doi: 10.1088/1674-1137/40/11/117001

RIS(for EndNote,Reference Manager,ProCite)

BibTex

Txt

Milestone

Received: 2016-03-28
Revised: 2016-04-28

Article Metric

Article Views(1852)
PDF Downloads(65)
Cited by(0)

Policy on re-use

To reuse of subscription content published by CPC, the users need to request permission from CPC, unless the content was published under an Open Access license which automatically permits that type of reuse.

通讯作者: 陈斌, bchen63@163.com

1.
沈阳化工大学材料科学与工程学院沈阳 110142

Physics design of collimators to reduce lost particle background at the CEPC

1. Key Laboratory of Particle Acceleration Physics and Technology, Institute of High Energy Physics, CAS, Beijing 100049, China

Received Date: 2016-03-28

Accepted Date: 2016-04-28

Available Online: 2016-11-05

Abstract: At the CEPC (Circular Electron Positron Collider), which is proposed by the Chinese high energy physics community, the dominant background comes from radiative Bhabha scattering and the beamstrahlung effect according to preliminary research. Therefore, it is necessary to incorporate a collimator system to intercept particles that may be lost near the interaction region (IR). In this paper, we introduce some limitations in choosing the position and width of the collimators. A certain parameter range is determined which is confined by the β function and the width of the collimators. A suitable choice of the half width is made by exploring this parameter range. A simulation of the particle loss rate in the IR and the hit density in the vertex detector with and without the collimators shows that the set of parameters of the collimators we designed is appropriate and effective.

HTML

Reference (13)

Physics design of collimators to reduce lost particle background at the CEPC

Abstract：

References

Access

Article Metrics

Metrics

通讯作者: 陈斌, bchen63@163.com

Email This Article

Physics design of collimators to reduce lost particle background at the CEPC

HTML

目录