标题： 首次电子加速在可调速度激光等离子体波浪场中 显示英文标题

标题： First Electron Acceleration in a Tunable-Velocity Laser Wakefield

摘要： 我们首次实验确认，由飞行焦点脉冲产生的激光等离子体加速器能够保持必要的相干结构，以将电子加速到相对论能量。 通过结合光束的时空近场整形以及使用轴抛物面镜——一种产生准贝塞尔光束的长焦深镜片——来调节等离子体波的传播速度，从而控制可实现的最大电子能量。 实验数据得到了先进的光学和粒子模拟的支持，并与简化的分析模型一致。 综上所述，这些结果显著加强了飞行焦点等离子体波作为减轻激光等离子体加速中去相位效应策略的依据。 显示英文摘要

摘要： We present the first experimental confirmation that a laser-wakefield accelerator produced by a flying focus pulse is able to maintain the coherent structures necessary to accelerate electrons to relativistic energies. Through a combination of spatio-temporal near-field shaping of the beam and focusing with an axiparabola - a long-focal-depth mirror that produces a quasi-Bessel beam - the propagation velocity of the wakefield is tuned to control the maximum electron energy achievable. The experimental data are supported by advanced optical and particle-in-cell simulations and are aligned with a simplified analytical model. Together, the results significantly strengthen the case for the flying-focus wakefield as a strategy for mitigating dephasing in laser-wakefield acceleration.