质子加速器是将带正电的质子加速到所需能量的装置，广泛用于基础粒子物理研究、医学放射治疗、同位素制备和材料改性。
其基本原理是通过射频电场对质子做功提高动能，利用磁场对束流进行引导与聚焦，设备需在高真空中运行以减少粒子散射。
常见类型包括直线加速器（LINAC）、回旋加速器和同步加速器，现代系统多采用射频空腔与四极磁铁配合以保持束流质量。
质子束在介质中具有明显的布拉格峰（Bragg peak），能量释放集中，因而在肿瘤放疗中能够精确轰击病灶，常用能量范围约为70–250 MeV；放疗技术包括被动散射和铅笔束扫描（pencil-beam scanning）。
此外，质子加速器可生产医用同位素、用于材料辐照试验及大型对撞实验（如CERN等机构进行的高能物理研究）。
运行时必须配备完备的真空系统、射频控制、束流测量与辐射屏蔽，并实施严格的安全监控。
未来发展方向侧重于提高能量与稳定性、设备紧凑化与成本降低，研究热点包括超导射频技术、高频腔体、等离子体与激光驱动加速等新型方案，以推动临床应用普及与科学前沿探索。
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