CEPC-SPPC accelerator status towards CDR

In this paper we will give an introduction to the Circular Electron Positron Collider (CEPC). The scientific background, physics goal, the collider design requirements and the conceptual design principle of the CEPC are described. On the CEPC accelerator, the optimization of parameter designs for the CEPC with different energies, machine lengths, single ring and crab-waist collision partial double ring, advanced partial double ring and fully partial double ring options, etc. have been discussed systematically, and compared. The CEPC accelerator baseline and alternative designs have been proposed based on the luminosity potential in relation with the design goals. The CEPC subsystems, such as the collider main ring, booster, electron positron injector, etc. have also been introduced. The detector and the MAchine-Detector Interface (MDI) design have been briefly mentioned. Finally, the optimization design of the Super Proton-Proton Collider (SppC), its energy and luminosity potentials, in the same tunnel of the CEPC are also discussed. The CEPC-SppC Progress Report (2015-2016) has been published.

在本文中，我们将对环形正负电子对撞机（CEPC）进行介绍。描述了CEPC的科学背景、物理目标、对撞机设计要求以及概念设计原则。在CEPC加速器方面，系统地讨论并比较了具有不同能量、机器长度、单环以及蟹腰碰撞部分双环、先进部分双环和完全部分双环等选项的CEPC的参数设计优化。基于与设计目标相关的光度潜力，提出了CEPC加速器的基线设计和替代设计。还介绍了CEPC的子系统，例如对撞机主环、增强器、正负电子注入器等。简要提及了探测器以及机器 - 探测器接口（MDI）设计。最后，还讨论了在CEPC同一隧道中的超级质子 - 质子对撞机（SppC）的优化设计、其能量和光度潜力。《CEPC - SppC进展报告（2015 - 2016）》已经发布。