论文标题
激光Wakefield加速度效率的表征跨越了IR光谱测量值
Characterisation of Laser Wakefield Acceleration Efficiency with Octave Spanning Near-IR Spectrum Measurements
论文作者
论文摘要
我们报告了GEV级激光Wakefield加速器中能量转移效率的实验测量。通过同时测量激光光子减速和电子的加速度，可以诊断出从激光器到血浆尾矿的能量转移，以及从血浆到加速电子束的转移。我们将提取效率定义为电子束获得的能量与自引导激光模式损失的能量的比率，它通过调整等离子密度和长度而最大化为$ 19 \ pm3 $ \％。跨八度激光频谱测量提供的其他信息允许独立优化等离子体效率项，这是提高激光Wakefield加速器的整体效率所必需的。
We report on experimental measurements of energy transfer efficiencies in a GeV-class laser wakefield accelerator. Both the transfer of energy from the laser to the plasma wakefield, and from the plasma to the accelerated electron beam were diagnosed by simultaneous measurement of the deceleration of laser photons and the acceleration of electrons as a function of plasma length. The extraction efficiency, which we define as the ratio of the energy gained by the electron beam to the energy lost by the self-guided laser mode, was maximised at $19\pm3$\% by tuning of the plasma density and length. The additional information provided by the octave-spanning laser spectrum measurement allows for independent optimisation of the plasma efficiency terms, which is required for the key goal of improving the overall efficiency of laser wakefield accelerators.
