<p>Simulated values for the vacuum exit window.</p>

Electron beam water treatment (EBWT) is a promising approach for remediating water contaminated with per- and polyfluoroalkyl substances (PFAS). In this study, we assess the feasibility of using a compact, high-average-power superconducting radio-frequency (SRF) photoinjector as a source for delivering the electron beam parameters required to initiate PFAS degradation. Our goals are twofold: first, to determine whether such a system can achieve the necessary dose and dose rate through sufficient beam energy and power; and second, to establish an experimental platform for investigating how different beam conditions affect degradation pathways. We envision a compact and mobile SRF-based accelerator that can be deployed at contamination hotspots - such as the former Berlin airport Tegel - offering significantly faster and potentially more effective treatment than conventional remediation methods. Based on theoretical analysis and computational modeling, we identify the SRF photoinjector at Helmholtz-Zentrum Berlin (HZB) as a suitable R&D platform. To support experimental validation, we developed a proof-of-concept in-air beamline optimized for balancing dose deposition and thermal management. This setup will enable the systematic study of key operational parameters, including dose rate, energy deposition, and thermal stability, under controlled beam conditions.电子束水处理技术（Electron beam water treatment, EBWT）是修复受全和多氟烷基物质（per- and polyfluoroalkyl substances, PFAS）污染水体的极具应用前景的方案。本研究评估了采用紧凑型高平均功率超导射频（superconducting radio-frequency, SRF）光电注入器作为电子束源的可行性，该电子束需满足引发PFAS降解所需的参数条件。本研究兼具双重目标：其一，验证该系统能否通过足够的束流能量与功率，实现必要的辐照剂量与剂量率；其二，搭建实验平台以探究不同束流条件对PFAS降解路径的影响。我们设想开发一款紧凑型可移动的基于SRF的加速器，可部署于污染热点区域——例如前柏林泰格尔机场——其处理速度将显著快于传统修复方法，且潜在效果更优。基于理论分析与计算建模，我们选定亥姆霍兹柏林中心（Helmholtz-Zentrum Berlin, HZB）的SRF光电注入器作为合适的研发平台。为支撑实验验证，我们开发了一套概念验证型大气束线装置，该装置经过优化以平衡剂量沉积与热管理需求。该实验装置将实现在可控束流条件下，对剂量率、能量沉积、热稳定性等关键运行参数的系统性研究。