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

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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)
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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

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

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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.