质子加速器是一种将质子（氢核）加速到高能量的装置，广泛应用于基础物理研究、医学和工业。
常见类型包括回旋加速器、同步加速器和直线加速器，各有能量范围与束流特性。
其工作原理依托电场对粒子加速、磁场对束流引导与聚束，使质子沿预定轨道或直线增速并被输运到靶点。
临床使用的质子能量一般在70–250 MeV之间，能穿透人体不同深度并在布拉格峰处释放最大剂量，显著减少对周围正常组织的损伤。
回旋加速器通常提供到约250 MeV的连续束流，便于放疗与同位素生产；同步加速器适合需要更高能量和脉冲束流的基础研究。
质子放疗在束流输运上有被动散射与主动扫描两种方式，主动扫描（剂量绘制）能更精确地匹配肿瘤形状。
除医疗外，质子束被用于探测粒子相互作用、合成同位素、材料改性、半导体辐照与结构分析。
未来发展方向包括紧凑型与便携加速器、激光驱动质子加速、更高能量与高通量系统，以及降低成本以提升临床可及性。
与此同时，辐射防护、剂量精确性、加速器可靠性与运维成本仍是工程与临床推广中的关键挑战。
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