Conceptual design of the CEPC dumping system

Background The circular electron-positron collider (CEPC) is a double-ring collider proposed by Chinese scientists. It will be operated at centre-of-mass energy of 240,90,160 GeV and maybe also 360 GeV.Purpose The total energy stored in the collider is up to 20 MJ. It is important to extract beams safely and not to damage the dump. In this paper, a dumping system including dilution kickers and absorber core with iron shielding is discussed.Methods The Monte Carlo code FLUKA is used to obtain the deposited energy and dose-equivalent distributions. The temperature rises are calculated assuming no heat conduction.Results Compared with the melting point and upper limit of dose equivalent, the magnets parameters are determined and the dimensions of the core and shielding are optimized.Conclusion The design of the dumping system meets the requirement that the energy stored in the collider can be absorbed safely.