The circular electron–positron collider beam energy measurement with Compton scattering and beam tracking method

The beam energy of the circular electron–positron collider should be measured precisely to the order of 1 MeV, in order to decrease the uncertainty of the Higgs/W/Z bosons’ mass measurement. For this purpose, a lepton bunch is extracted from the collider and collides with an Yttrium–Aluminum–Garnet...

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Bibliographic Details
Published in:Review of scientific instruments 2020-03, Vol.91 (3), p.033109-033109
Main Authors: Tang, Guangyi, Chen, Shanhong, Chen, Yuan, Duan, Zhe, Ruan, Manqi, An, Guangpeng, Huang, Yongsheng, Lou, Xinchou, Zhang, Jianyong, Lan, Xiaofei, Zhang, Chunlei
Format: Article
Language:English
Subjects:
Aluminum
Bosons
Computer simulation
Elastic scattering
Electron-positron accelerators
Energy measurement
Laser beams
Leptons
Magnetic fields
Scientific apparatus & instruments
Spatial resolution
Synchrotron radiation
Uncertainty
Yttrium
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Summary:The beam energy of the circular electron–positron collider should be measured precisely to the order of 1 MeV, in order to decrease the uncertainty of the Higgs/W/Z bosons’ mass measurement. For this purpose, a lepton bunch is extracted from the collider and collides with an Yttrium–Aluminum–Garnet laser pulse. After the inverse Compton scattering, the main beam and the scattered beam pass through an analytical magnetic field and are deflected to different angles. At the end of the drift beam pipes, the deflecting distances are detected with the spatial resolution of several microns. The systematic uncertainties caused by the detector arrangement, the magnetic field, the angle between the detector plane and the incident beam, and the synchrotron radiation are discussed in detail. The simulations of the statistical errors are given with a toy Monte Carlo sample. With some proper corrections, the beam energy uncertainty of the Higgs mode is around 2 MeV. Our method is applicable to different operating modes of the collider.
ISSN:0034-6748
1089-7623
DOI:10.1063/1.5132975