连续激光驱动α粒子源
Continuous Laser-Driven α Source
- Tel-Aviv University（特拉维夫大学）
- SLAC National Accelerator Laboratory（SLAC国家加速器实验室）
- Stanford University（斯坦福大学）
- Sandia National Laboratories（桑迪亚国家实验室）
机构由 AI 辅助整理，请以论文原文为准。
AI总结：
本文提出一种利用连续水叶靶和氮化硼转换器实现激光驱动质子-硼聚变连续产生α粒子的方法，实验验证了高重复率下的稳定产额，为粒子治疗和聚变研究提供新途径。
AI中文摘要：
激光驱动的质子-硼聚变为在紧凑尺度上产生α粒子提供了一条途径。然而，传统的固体靶实验从根本上受到靶材退化和低重复射击能力的限制。在此，我们展示了一种连续的激光驱动α粒子源，利用来自连续可补充的超薄水叶射流靶的靶法向鞘层加速。质子束与下游的氮化硼转换器相互作用，驱动$^{11}\text{B}(p,\alpha)^{8}\text{Be}$反应，产生三个α粒子。该测量在$10\\,\text{Hz}$的速率下重复进行了$18{,}000$次连续射击。测量了出射α粒子的产额和谱通量，并与全面的粒子输运模拟进行了基准比较。数值和实验结果表明，从转换器逃逸的α粒子能量微分谱出现明显的平坦化，这是由深度相关的反应产额和阻止本领效应驱动的。在高累积产额下持续稳定的α粒子产生为靶向粒子治疗和激光驱动等离子体聚变研究中的应用铺平了道路。
英文摘要：
Laser-driven proton-boron fusion offers a path for generation of $α$ particles on a compact scale. Conventional solid-target experiments, however, are fundamentally limited by target degradation and low shot-repetition capacity. Here, we demonstrate a continuous laser-driven $α$ particle source utilizing target-normal sheath acceleration from a continuously replenishable ultrathin water-leaf jet target. The proton beam interacts with a downstream boron nitride converter, driving the $^{11}\text{B}(p,α)^{8}\text{Be}$ reaction which yields three $α$ particles. The measurement was repeated across $18{,}000$ consecutive shots at a rate of $10\,\text{Hz}$. The outgoing $α$-particle yield and spectral fluence were measured and benchmarked against comprehensive particle-transport simulations. The numerical and experimental results reveal a pronounced flattening in the energy-differential $α$-particle spectrum escaping from the converter, driven by depth-dependent reaction yield and stopping power effects. The sustained stable $α$-particle production at high cumulative yields paves the way for applications in targeted particle therapy and laser-driven plasma-fusion research.
