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

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

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