CEPC High-Granularity Calorimeter Successfully Completes 2023 Beam Test (2024-01-03)

The future Circular Electron-Positron Collider (CEPC) calorimeter team has successfully completed the 2023 high-granularity calorimeter beam test at the European Organization for Nuclear Research (CERN) and the German Electron Synchrotron Laboratory (DESY).

In September 2012, Chinese scientists first proposed the CEPC international major science plan. The proposal aims to build the next-generation high-energy electron-positron collider as a Higgs factory in China, which can also serve as a Z and W boson factory. Using the Higgs boson as a probe, the plan aims to deeply study the spontaneous symmetry breaking mechanism of electroweak symmetry and the origin of mass, and explore major scientific questions such as dark matter, electroweak phase transition in the early universe evolution, and matter-antimatter asymmetry in the universe. The CEPC team has carried out key detector technology research and development and achieved a series of significant progress.

The high-granularity calorimeter system based on particle flow algorithms is one of the key detectors. The CEPC team has developed the world's first high-granularity electromagnetic calorimeter technical prototype based on scintillators and silicon photomultipliers (SiPMs), and China's first high-granularity hadron calorimeter technical prototype.

The CEPC calorimeter research team, composed of the Institute of High Energy Physics of the Chinese Academy of Sciences, University of Science and Technology of China, Shanghai Jiao Tong University, Lee Tsung-Dao Institute and other units, conducted tests on particle beam lines at CERN's Super Proton Synchrotron (SPS) and Proton Synchrotron (PS) from April to May 2023. Young Researcher Yong Liu from the Institute of High Energy Physics, Chinese Academy of Sciences, and Professor Yunlong Zhang from the University of Science and Technology of China served as technical coordinators of the beam test team, cooperating with Associate Professor Zhongtao Shen from the University of Science and Technology of China and Professor Toru Takeshita from Shinshu University, Japan, to execute data-taking plans and ensure the successful completion of various testing tasks.

Figure 1: CEPC calorimeter beam test team with prototype at CERN SPS-H2 beam line

Figure 2: CEPC calorimeter beam test team with calorimeter prototype at CERN PS-T09 beam line