Conceptual design report of the Super Tau-Charm Facility: the accelerator
X. Ai, L. An, Shizhong An, Y. Bai, Zhenghe Bai, O. Bakina, Jie Bao, V. Batozskaya, A. Belias, M. E. Biagini, Ligong Bian, Denis Bodrov, A. Bogomyagkov, M. Boscolo, I. Boyko, Ze-Xin Cao, S. A. Çetin, Marina Chadeeva, Ming-Xuan Chang, Qin Chang, Dian-Yong Chen, Fang-Zhou Chen, Chen Hai, Hua-Xing Chen, Jinhui Chen, Long Chen, Long-Bin Chen, Qi Chen, Qushan Chen, Shaomin Chen, Wei Chen, Ying Chen, Zhi Chen, Shan Cheng, Sibo Cheng, Tongguang Cheng, L. R. Dai, L. Dai, Xin-Chen Dai, A. G. Denig, I. Denisenko, Denis Derkach, Heng-Tong Ding, Ming-Hui Ding, Xiao Ding, L. Y. Dong, Y. Du, Prokhor Egorov, Kuanjun Fan, Siyuan Fan, S. S. Fang, Zhu-Jun Fang, Song Feng, Xu Feng, Hai-Bing Fu, Jun Gao, Yuanning Gao, Zihan Gao, Cong Geng, Li‐Sheng Geng, Hai-Liang Gong, Jia-Ding Gong, L. Gong, Shao-Kun Gong, Sergi Gonzàlez-Solís, Bo-Xing Gou, Duan Gu, Hao Guo, Jun Guo, Tengjun Guo, Xin‐Heng Guo, Yuhui Guo, Yuping Guo, Zhi-Hui Guo, Selçuk Hacıömeroğlu, Eiad Hamwi, C. Han, T. T. Han, Xi-Qing Hao, Chong-Chao He, J. He, Tianlong He, Xiao-Gang He, Masahito Hosaka, Kai-Wen Hou, Zhi-Long Hou, Dong-Dong Hu, H. Hu, Hao Hu, Qipeng Hu, Tongning Hu, Xiao-Cheng Hu, Y. Hu, Zhen Hu, Dazhang Huang, Fei Huang, Guang-Shun Huang, Liangsheng Huang, Peng-Wei Huang, Rui Huang
Abstract
Abstract Electron–positron colliders operating in the GeV center-of-mass range, or tau-charm energy region, have been proved to enable competitive frontier research due to several unique features. With the progress of high-energy physics in the last two decades, a new-generation Tau-Charm factory, called the Super Tau-Charm Facility (STCF), has been actively promoted by the particle physics community in China. STCF has the potential to address fundamental questions such as the essence of color confinement and the matter–antimatter asymmetry within the next decades. The main design goals of the STCF are a center-of-mass energy ranging from 2 to 7 GeV and a luminosity surpassing 5 × 10 34 cm −2 s −1 that is optimized at a center-of-mass energy of 4 GeV, which is approximately 50 times that of the currently operating Tau-Charm factory—BEPCII. The STCF accelerator has two main parts: a double-ring collider with a 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 research and development, 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).