质子加速器是用于加速质子到高能状态的装置，广泛应用于基础物理研究、医用放射治疗和同位素制备。
基本原理是借助电场提高质子动能，磁场用于束流引导与聚焦。
常见类型包括回旋加速器、同步加速器与直线加速器，近年还发展出激光驱动和紧凑型加速器技术。
质子束在肿瘤治疗中的精准能量沉积（布拉格峰）使其在放疗中具有较小的副作用。
运行质子加速器需要高精度的束流控制、稳定的射频系统以及严密的辐射防护，同时建设与维护成本高昂。
自20世纪以来，随着射频技术和超导磁体的发展，质子加速器从大型国家实验室扩展到医院与企业应用。
大型设施如CERN、J-PARC和PSI承担着粒子物理、核物理与材料科学的重要任务，而医院中用于肿瘤治疗的加速器促进了临床转化。
关键技术包括高梯度加速腔、超导磁体、精密探测器和束流诊断，未来与人工智能、精密制造结合将进一步提升可靠性与可及性。
同时，环境影响、放射性废物管理和专业人才培养也是推广应用中必须解决的问题，国际合作将有助于资源共享与标准统一。
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