质子加速器是一种将氢原子去除电子后得到的质子，通过电场和磁场逐级加速至所需能量并输运到靶点或实验装置的系统。
典型构成包括离子源、低能束输运、射频四极（RFQ）或直线加速段、同步加速器或回旋加速器、束流传输与提取系统以及靶站/实验站。
射频腔为质子提供能量增量，磁铁负责聚焦与偏转，束诊断与反馈系统保证束流质量与稳定性。
质子束因质量较大、能量可控且具有明显的布拉格峰，广泛用于肿瘤的质子放射治疗（常见能量范围约70–250 MeV）、同位素制备、材料科学中的中子散裂源以及高能物理实验（GeV至TeV级别）。
世界知名设施包括CERN、瑞士PSI、日本RIKEN及多国质子治疗中心。
建设与运行挑战包括高成本、复杂的辐射屏蔽与安全管理、高功率射频与超导磁体技术以及束流稳定性控制。
未来发展方向着眼于超导射频与超导磁体提升效率、借助激光等离子体实现更紧凑的加速方案、小型化与桌面化系统普及临床应用，以及提高束流亮度与传输效率，以推动科研与医疗的更广泛普及。
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