Title: Laser-driven ion acceleration in long-lived optically shaped gaseous targets enhanced by magnetic vortices Show Chinese title

Title: 在光学成形气态靶长时间存在的激光驱动离子加速增强由磁涡旋产生

Abstract: This research demonstrates high-repetition-rate laser-accelerated ion beams via dual, intersecting, counterpropagating laser-driven blast waves to precisely shape underdense gas into long-lived near-critical density targets. The collision of the shock fronts compresses the gas and forms steep density gradients with scale lengths of a few tens of microns. The compressed target persists for several nanoseconds, eliminating laser synchronization constraints. Measurements of multi-MeV ion energy spectra are reported. 3D hydrodynamic simulations are used to optimize the density profile and assess the influence of the Amplified Spontaneous Emission of the femtosecond accelerating laser pulse. A synthetic optical probing model is applied to directly compare simulations with experimental data. 3D Particle-In-Cell simulations reveal the formation of multi-kT, azimuthal magnetic fields, indicating Magnetic Vortex Acceleration as the main acceleration mechanism. Show Chinese abstract

Abstract: 本研究通过双路、相交、反向传播的激光驱动爆轰波精确塑造欠密气体为长寿近临界密度靶材，从而演示了高重复频率激光加速离子束。 冲击波前的碰撞压缩气体，并形成尺度长度仅为几十微米的陡峭密度梯度。 压缩靶材持续数纳秒，消除了激光同步约束。 报告了多兆电子伏特离子能量谱的测量结果。 采用三维流体力学模拟优化密度剖面并评估飞秒加速激光脉冲自发放大辐射的影响。 应用合成光学探测模型直接比较模拟与实验数据。 三维粒子加速模拟揭示了多千开尔文、环形磁场的形成，表明磁涡加速为主要加速机制。