Conceptual Design Report of Super Tau-Charm Facility: The Accelerator
Abstract
Electron-positron colliders operating in the GeV region of center-of-mass energies or the Tau-Charm energy region, have been proven to enable competitive frontier research, due to its several unique features. With the progress of high energy physics in the last two decades, a new-generation Tau-Charm factory, Super Tau Charm Facility (STCF) has been actively promoting by the particle physics community in China. STCF holds great potential to address fundamental questions such as the essence of color confinement and the matter-antimatter asymmetry in the universe in the next decades. The main design goals of STCF are with a center-of-mass energy ranging from 2 to 7 GeV and a peak luminosity surpassing 5*10^34 cm^-2s^-1 that is optimized at a center-of-mass energy of 4 GeV, which is about 50 times that of the currently operating Tau-Charm factory - BEPCII. The STCF accelerator is composed of two main parts: a double-ring collider with the crab-waist collision scheme and an injector that provides top-up injections for both electron and positron beams. As a typical third-generation electron-positron circular collider, the STCF accelerator faces many challenges in both accelerator physics and technology. In this paper, the conceptual design of the STCF accelerator complex is presented, including the ongoing efforts and plans for technological R&D, as well as the required infrastructure. The STCF project aims to secure support from the Chinese central government for its construction during the 15th Five-Year Plan (2026-2030) in China.
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@article{arxiv.2509.11522,
title = {Conceptual Design Report of Super Tau-Charm Facility: The Accelerator},
author = {Jiancong Bao and Anton Bogomyagkov and Zexin Cao and Mingxuan Chang and Fangzhou Chen and Guanghua Chen and Qi Chen and Qushan Chen and Zhi Chen and Kuanjun Fan and Hailiang Gong and Duan Gu and Hao Guo and Tengjun Guo and Chongchao He and Tianlong He and Kaiwen Hou and Hao Hu and Tongning Hu and Xiaocheng Hu and Dazhang Huang and Pengwei Huang and Ruixuan Huang and Zhicheng Huang and Hangzhou Li and Renkai Li and Sangya Li and Weiwei Li and Xuan Li and Xunfeng Li and Yu Liang and Chao Liu and Tao Liu and Xiaoyu Liu and Xuyang Liu and Yuan Liu and Huihui Lv and Qing Luo and Tao Luo and Mikhail Skamarokha and Shaohang Ma and Wenbin Ma and Masahito Hosaka and Xuece Miao and Yihao Mo and Kazuhito Ohmi and Jian Pang and Guoxi Pei and Zhijun Qi and Fenglei Shang and Lei Shang and Caitu Shi and Kun Sun and Li Sun and Jingyu Tang and Anxin Wang and Chengzhe Wang and Hongjin Wang and Lei Wang and Qian Wang and Shengyuan Wang and Shikang Wang and Ziyu Wang and Shaoqing Wei and Yelong Wei and Jun Wu and Sang Wu and Chunjie Xie and Ziyu Xiong and Xin Xu and Jun Yang and Penghui Yang and Tao Yang and Lixin Yin and Chen Yu and Ze Yu and Youjin Yuan and Yifeng Zeng and Ailin Zhang and Haiyan Zhang and Jialian Zhang and Linhao Zhang and Ning Zhang and Ruiyang Zhang and Xiaoyang Zhang and Yihao Zhang and Yangcheng Zhao and Jingxin Zheng and Demin Zhou and Hao Zhou and Yimei Zhou and Zeran Zhou and Bing Zhu and Xinghao Zhu and Zi'an Zhu and Ye Zou},
journal= {arXiv preprint arXiv:2509.11522},
year = {2025}
}
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296 pages