Study of beamstrahlung effects at CEPC

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Qing-Lei Xiu, Hong-Bo Zhu, Teng Yue and Xin-Chou Lou. Study of beamstrahlung effects at CEPC[J]. Chinese Physics C, 2016, 40(5): 053001. doi: 10.1088/1674-1137/40/5/053001
Qing-Lei Xiu, Hong-Bo Zhu, Teng Yue and Xin-Chou Lou. Study of beamstrahlung effects at CEPC[J]. Chinese Physics C, 2016, 40(5): 053001.  doi: 10.1088/1674-1137/40/5/053001 shu
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Received: 2015-05-11
Revised: 2016-01-14
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    Supported by CAS/SAFEA International Partnership Program for Creative Research Teams, CAS and IHEP Thousand Talent and Hundred Talent programs, and grants from the State Key Laboratory of Nuclear Electronics and Particle Detectors

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Study of beamstrahlung effects at CEPC

    Corresponding author: Qing-Lei Xiu,
    Corresponding author: Hong-Bo Zhu,
  • 1. State Key Laboratory of Particle Detection and Electronics, Beijing 100049, China
  • 2. Institute of High Energy Physics, CAS, Beijing 100049, China
  • 3. Institute of High Energy Physics, CAS, Beijing 100049, China
  • 4. University of Chinese Academy of Sciences, Beijing 100049, China
  • 5. University of Texas at Dallas, Richardson, TX 75080-3021, USA
Fund Project:  Supported by CAS/SAFEA International Partnership Program for Creative Research Teams, CAS and IHEP Thousand Talent and Hundred Talent programs, and grants from the State Key Laboratory of Nuclear Electronics and Particle Detectors

Abstract: The discovery of a 125 GeV Higgs boson at the LHC marked a breakthrough in particle physics. The relative lightness of the new particle has inspired consideration of a high-luminosity Circular Electron Positron Collider(CEPC) as a Higgs Factory to study the particle's properties in an extremely clean environment. Given the high luminosity and high energy of the CEPC, beamstrahlung is one of the most important sources of beam-induced background that might degrade the detector performance. It can introduce even more backgrounds to the detector through the consequent electron-positron pair production and hadronic event generation. In this paper, beamstrahlung-induced backgrounds are estimated with both analytical methods and Monte Carlo simulation. Hit density due to detector backgrounds at the first vertex detector layer is found to be~0.2 hits/cm2 per bunch crossing, resulting in a low detector occupancy below 0.5%. Non-ionizing energy loss(NIEL) and total ionizing dose(TID), representing the radiation damage effects, are estimated to be~1011 1 MeV neq/cm2/yr and~300 kRad/yr, respectively.

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