质子加速器是一种将质子加速到高能量的装置，广泛应用于基础科研、医学和工业。
常见类型有回旋加速器、直线加速器和同步加速器，能量范围从数十MeV（临床治疗用）到数百GeV（高能物理研究）。
其主要组成包括质子源、加速腔、磁聚焦与偏转系统、真空束管与诊断探测器，以及屏蔽与控制系统。
质子束因布拉格峰效应可在深度处集中释放能量，使肿瘤放疗（通常70–250MeV）对周围正常组织损伤更小，从而成为精确放射治疗的重要手段。
科研方面，质子加速器用于探测核结构、生成放射性同位素、材料科学实验与对撞研究（如大型加速器链的前级设备）。
工业应用包括材料改性、辐照测试与无损检测。
当前技术发展侧重于超导磁体、紧凑型与桌面化加速器、激光等离子体加速技术以及精确剂量学与成本控制，旨在提高能效、降低体积与费用并扩大临床与科研的可及性。
随着工程与医疗需求增长，质子加速器将在精准治疗与科学探索中扮演愈加重要的角色。
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