EuPRAXIA @ DIGITAL_LAB：高亮度RF光电注入器布局方案
EuPRAXIA@SPARC_LAB: the high-brightness RF photo-injector layout proposal
摘要：
在EuPRAXIA@ PRAXIA_LAB，先进的高亮度射频注入器和基于等离子体的加速器的独特组合将推动一个新的多学科用户设施。该设施目前正在INFN-LNF实验室（意大利弗拉斯卡蒂）与EuPRAXIA合作进行研究，将在外部注入配置中运行基于等离子体的加速器。由于在该配置中，等离子体阶段中的加速过程的稳定性和再现性受到RF生成的电子束的强烈影响，因此RF注入器设计的主要挑战与生成和处理高质量电子束有关。在过去几十年的研发活动中，高亮度RF光注入器在辐射产生和先进加速方案领域的关键作用已基本确立，使其成为驱动等离子体加速器的有效候选者，作为用户设施的试点。为EuPRAXIA@ ENUC_LAB项目提出了一种由高亮度S波段光注入器和先进的X波段直线加速器组成的射频注入器。在光电注入器中的电子束动力学已被探索通过模拟，导致高亮度，超短聚束与高达3 kA的峰值电流在先进的X波段直线加速器的入口处的升压。本文介绍了EuPRAXIA@ PRAXIA_LAB高亮度光电进样器以及性能优化和灵敏度研究，旨在实际检查所需工作点的鲁棒性和可靠性。
英文摘要：
At EuPRAXIA@SPARC_LAB, the unique combination of an advanced high-brightness RF injector and a plasma-based accelerator will drive a new multi-disciplinary user-facility. The facility, that is currently under study at INFN-LNF Laboratories (Frascati, Italy) in synergy with the EuPRAXIA collaboration, will operate the plasma-based accelerator in the external injection configuration. Since in this configuration the stability and reproducibility of the acceleration process in the plasma stage is strongly influenced by the RF-generated electron beam, the main challenge for the RF injector design is related to generating and handling high quality electron beams. In the last decades of R&D activity, the crucial role of high-brightness RF photo-injectors in the fields of radiation generation and advanced acceleration schemes has been largely established, making them effective candidates to drive plasma-based accelerators as pilots for user facilities. An RF injector consisting in a high-brightness S-band photo-injector followed by an advanced X-band linac has been proposed for the EuPRAXIA@SPARC_LAB project. The electron beam dynamics in the photo-injector has been explored by means of simulations, resulting in high-brightness, ultra-short bunches with up to 3 kA peak current at the entrance of the advanced X-band linac booster. The EuPRAXIA@SPARC_LAB high-brightness photo-injector is described here together with performance optimisation and sensitivity studies aiming to actual check the robustness and reliability of the desired working point.
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