The Circular Electron Positron Collider (CEPC) is a long-term collider project, which will be divided into two phases. The first phase will construct a circular electron-positron collider in a tunnel with a circumference of 50 – 70 km, and detectors installed at two interaction points. The machine is expected to collide electron and positron beams at the center-of-mass energy of 240
– 250 GeV, with an instantaneous luminosity of 2×1034 cm-2
s-1. The baseline design considers a single ring in a 50/70 km tunnel and electron/positron beams following a pretzelled orbit in the ring. CEPC will serve as a Higgs Factory where precise measurement of Higgs properties will be its top priority. In addition, CEPC will allow stringent tests of the Standard Model (SM) with precision measurements at the Z pole and WW thresholds. The second phase of the project will upgrade the machine to a proton-proton collider with an unprecedented center-of-mass energy of 50
– 70 TeV. The machine will offer a unique opportunity for direct searches for New Physics in the high-energy range far beyond LHC reach. Find out more in Prof. Yifang Wang's talk.
Preliminary machine parameters for the electron
positron collider have been calculated and listed in the table below.
Pre-studies and preparation work are being carried out and will last till 2015. The pre Conceptual Design Report (CDR), as the first milestone of the CEPC project, will be released by the end of 2014. Intensive R&D efforts will be launched between 2016 and 2020, with the Technical Design Report (TDR) to be accomplished by 2020. The electron positron collider will start construction in 2021 and complete in 2027. The machine is expected to start data taking in 2028 and will run effectively till 2035.
The R&D efforts on the proton-proton collider will be pursued between 2020 and 2030, followed by the engineering design to be finished by 2035. From 2035 to 2042, the machine will be constructed in the same tunnel as the electron-positron collider. The machine will start to take data as early as 2042.
Qinghuada(秦皇岛), with great geological conditions and strong support from the local municipal
government, could be the potential site.