C $^3$示范研究和开发计划
C$^3$ Demonstration Research and Development Plan
摘要：
C $^3$是一个机会，以实现一个e $^+$ e $^-$对撞机的研究希格斯玻色子在$\sqrt{s} = 250$ GeV，一个明确的升级路径，以550 GeV，同时保持在相同的短设施的足迹。C $^3$基于一种全新的正常传导直线加速器方法，该方法以相对较低的成本实现高梯度和高效率。鉴于直线对撞机设计的先进状态，C $^3$需要技术成熟的关键系统是主直线加速器。本白皮书介绍了通过直接（源和主直线加速器）和并行（束流传输、阻尼环、辅助组件）研发来展示C $^3$技术的分阶段方法。该白皮书还讨论了技术产业化的方法、由C $^3$研发支持的相关HEP研发活动、基础设施要求和选址选择。
英文摘要：
C$^3$ is an opportunity to realize an e$^+$e$^-$ collider for the study of the Higgs boson at $\sqrt{s} = 250$ GeV, with a well defined upgrade path to 550 GeV while staying on the same short facility footprint. C$^3$ is based on a fundamentally new approach to normal conducting linear accelerators that achieves both high gradient and high efficiency at relatively low cost. Given the advanced state of linear collider designs, the key system that requires technical maturation for C$^3$ is the main linac. This white paper presents the staged approach towards a facility to demonstrate C$^3$ technology with both Direct (source and main linac) and Parallel (beam delivery, damping ring, ancillary component) R&D. The white paper also includes discussion on the approach for technology industrialization, related HEP R&D activities that are enabled by C$^3$ R&D, infrastructure requirements and siting options.
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