质子加速器是将质子加速到高能量以用于科研、医疗和工业的装置。
其工作原理主要依靠交变电场（如射频腔）逐级增加质子动能，辅以磁场对束流进行聚焦与偏转。
常见类型包括线性加速器（LINAC）、回旋加速器和同步加速器，近年来还出现激光等离子体等新兴加速技术。
高能质子束在粒子物理实验中用于探测基本相互作用，在材料科学中用于辐照与表征，在核工业中用于同位素制备与中子源生产。
医学上，质子束因布拉格峰效应能在肿瘤处沉积最大剂量，显著降低周围正常组织损伤，成为精准放疗的重要手段。
质子加速器的优势是能量可调、束斑可控，但面临高建设与维护成本、复杂的辐射防护和精密束流诊断等挑战。
未来发展方向包括超导射频技术以提高效率、紧凑化与成本下降的方案、以及更高亮度和稳定性的束流控制，推动其在基础研究与临床应用中更广泛的应用。
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