The CEPC Clock Issue and Finetuning of the Circumference
Abstract
The CEPC clock issue is related with the RF frequency coordination between the various accelerator systems and may affect the operation modes of both the accelerator and the detector. The timing structure of CEPC has been restudied with the collaboration of the accelerator team and the detector team. After discussions between two sides, the CEPC bunch structure is set such that the spacings between adjacent bunches in any CEPC operation mode are integer numbers of 23.08 ns. The master CEPC clock will be provided by the accelerator to the detector systems with a frequency of 43.33 MHz, synchronous to the beam. The CEPC detector system relies on the clock to sample physics signal at the right time. It was found that if the circumference of CEPC is slightly changed to 99955.418 m, not only is the orbit length closer to 100 km, but also the detector would benefit more for the first 10-year operation.
Keywords
Cite
@article{arxiv.2509.19026,
title = {The CEPC Clock Issue and Finetuning of the Circumference},
author = {Dou Wang and Jie Gao and Jianchun Wang and Dapeng Jin and Xiaohao Cui and Ge Lei and Cai Meng and Wei Wei and Jingbo Ye and Yiwei Wang and Jiyuan Zhai and Yuhui Li and Zhonghui Ma and Jun Hu and Shengsen Sun and Xiaolong Wang},
journal= {arXiv preprint arXiv:2509.19026},
year = {2025}
}