高能光子源中基于增强器的用于退出注入的束流回收方案
Booster-based beam recycling for swap-out injection at the High Energy Photon Source
中文总结 AI 辅助
针对第四代同步辐射光源高电荷退出注入需求，提出HEPS的基于增强器的束流回收方案，验证其可行性并建立高电荷注入运行基础。
中文摘要 AI 辅助
第四代同步辐射光源采用超低发射度储存环，对注入有严格要求。轴上退出注入可降低对储存环动态孔径的依赖，但高电荷运行需要高效的注入器架构，能够产生高电荷替换束团。本文介绍了在高能光子源（HEPS）上实现的基于增强器的束流回收退出注入方案的加速器物理设计与性能分析。在该方案中，全能量增强器同时作为注入器和高能积累器：提取的储存环束团被送回增强器，与之前从直线加速器注入的低电荷束团合并，并加速至全能量；经过高能阻尼后，合并束团被重新注入到原储存环的 bucket（ bucket 指束团桶）中。该方案无需专用积累环，同时实现高电荷束团替换。该回收方案通过分阶段机器研究完成调试，本文给出了完整的回收链模拟、调试研究及实测性能分析。实测结果表征了回收运行情况，并量化了完整回收环的传输效率和性能限制。这些结果证明了基于增强器的束流回收架构的可行性，为未来第四代同步辐射光源的高电荷退出注入建立了运行基础。
英文摘要
Fourth-generation synchrotron light sources employ ultralow-emittance storage rings with stringent injection requirements. On-axis swap-out injection alleviates the dependence on storage-ring dynamic aperture, but high-charge operation requires an efficient injector architecture capable of producing high-charge replacement bunches. This paper presents the accelerator physics design and performance analysis of a booster-based beam-recycling swap-out injection scheme implemented at the High Energy Photon Source (HEPS). In this approach, the full-energy booster serves as both an injector and a high-energy accumulator. An extracted storage-ring bunch is returned to the booster, merged with a low-charge bunch previously injected from the linac and accelerated to full energy. Following high-energy damping, the merged bunch is reinjected into the original storage-ring bucket. The scheme avoids the need for a dedicated accumulator ring while enabling high-charge bunch replacement. The recycling scheme was commissioned through staged machine studies. Full recycling-chain simulations, commissioning studies, and measured performance analysis are presented. The measured results characterize the recycling operation and quantify the transmission efficiency and performance limitations of the complete recycling loop. These results demonstrate the feasibility of the booster-based beam-recycling architecture and establish its operational basis for high-charge swap-out injection in future fourth-generation synchrotron light sources.
