质子加速器是一种将质子加速到高能状态的装置，利用交变电场（射频空腔）为粒子提供动能，借助电磁铁对束流进行聚焦与偏转。
常见类型包括回旋加速器、同步加速器和直线加速器：回旋机结构紧凑、适用于中低能段；同步加速器能达到更高能量，常用于高能物理研究与同位素生产；直线加速器在医疗领域也有广泛应用。
在技术实现上，现代质子加速器越来越多采用超导磁体与超导腔体，以提高能量效率和场强。
质子加速器的主要应用包括肿瘤的质子放射治疗、核医学同位素制备、材料科学中的离子束改性以及基础粒子物理实验。
由于质子在组织内具有布拉格峰效应，能在肿瘤处沉积最大能量，从而减少周围正常组织的受照剂量，这使得质子治疗在放疗中具有明显优势。
另一方面，高强度质子束会导致靶体与结构材料放射化，需严格的辐射防护与废物管理；对束流稳定性、精确对准与成像系统也提出了更高要求。
未来发展方向包括进一步缩小设备体积与成本、提升能量效率与束流稳定性、推广紧凑型治疗加速器以及发展更高强度的科研设施。
世界著名的相关机构有CERN、PSI和多个质子治疗中心，为该领域的技术进步提供了重要平台。
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