高约束分裂器的概念设计：FFA@CEBAF能级升级研究
Conceptual Design of Highly-Constrained Splitters for the FFA@CEBAF Energy Upgrade Study
AI总结：
本文提出了一种高约束分裂器的概念设计，用于CEBAF能级升级研究，通过多通过模拟和光学匹配方案满足严格的空间和束流动力学要求。
摘要：
连续电子束加速器设施（CEBAF）在杰弗逊实验室正在进行一项重要的能级升级研究，利用固定场交替梯度（FFA）回旋弧。该升级需要设计复杂的水平束流分裂器以管理多达六个同时的束流通过。本文提出了这些分裂器的概念设计，这些分裂器受到现有加速器隧道和多方面的束流动力学要求的严格限制，以匹配到永久磁体FFA弧。设计方法以Bmad工具包中的多通过模拟为中心，从初始几何布局到高级光学匹配均进行了详细说明。关键结果包括一个能够适应空间边界约束的稳健几何布局，以及多个灵活的光学匹配方案的开发。此外，设计还集成了一个可行的高能束流提取方案，以满足实验大厅的运营需求。本工作建立了一个全面且可行的概念设计，为未来工程和性能优化研究提供了基准。
英文摘要：
The Continuous Electron Beam Accelerator Facility (CEBAF) at Jefferson Lab is investigating a significant energy upgrade utilizing Fixed-Field Alternating-gradient (FFA) recirculating arcs. This upgrade requires the design of complex horizontal beam splitters to manage up to six concurrent beam passes. This paper presents the conceptual design of these splitters, which are subject to severe physical constraints imposed by the existing accelerator tunnel and multifaceted beam dynamics requirements for matching into the permanent-magnet FFA arcs. The design methodology, centered on multi-pass simulations in the Bmad toolkit, is detailed from the initial geometric layout through the advanced optics matching. Key results include a robust geometric arrangement that fits within the spatial boundaries and the development of multiple, flexible optics matching solutions. Furthermore, the design integrates a viable scheme for extracting high-energy beams for the experimental halls, a critical operational requirement. This work establishes a comprehensive and viable conceptual design, forming a baseline for future engineering and performance optimization studies.
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