质子加速器是一类利用电磁场将质子加速到高能量以产生可控粒子束的装置。
常见类型包括线性加速器（LINAC）、回旋加速器（Cyclotron）和同步加速器（Synchrotron），它们在结构和能量可达性上各有侧重。
质子束因具有明显的布拉格峰，在穿透介质时能将大部分能量集中释放于特定深度，因而在肿瘤放射治疗中可以精确杀伤病灶并减少对周围健康组织的损害。
除了临床应用外，质子加速器还广泛用于基础粒子物理、核物理实验、同位素制备与材料科学研究。
当前面临的主要挑战包括设备体积大、造价高、对技术维护与辐射防护要求严格。
为应对这些问题，科研界正推进紧凑型加速器、超导技术与激光驱动质子加速等新方向，旨在降低成本、提升束流质量并实现更广泛的临床普及。
随着多学科合作和工程进步，质子加速器将在科研与医疗领域继续发挥重要作用。
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