论文标题
分析光注射器横时空间和相位坐标
Analysis of photoinjector transverse phase space in action and phase coordinates
论文作者
论文摘要
光注射器是X射线游离电子激光器（XFEL）的主要高亮度电子源。 PhotoIntor降低是改善XFEL激光的关键旋钮之一，因此精确的发射率测量至关重要。众所周知，RMS发射率对相位空间中粒子分布的低强度尾部非常敏感，该粒子分布的测量取决于信号与噪声比（SNR）和图像处理程序。这种敏感性使横梁横向亮度具有挑战性的解释，从而导致不同的发射定义，以减少尾部颗粒的影响。在本文中，分析模型和实验的动作和相位坐标分析了横时空间，这给出了一种更直观的方法来计算梁核的亮度。
Photoinjectors are the main high brightness electron sources for X-ray free electron lasers (XFEL). Photoinjector emittance reduction is one of the key knobs for improving XFEL lasing, so precise emittance measurement is critical. It's well known that rms emittance is very sensitive to low intensity tails of particle distributions in the phase space, whose measurement depend on the signal to noise ratio (SNR) and image processing procedures. Such sensitivities make the interpretations of beam transverse brightness challenging, leading to different emittance definitions to reduce the impact of tail particles. In this paper, transverse phase space is analyzed in action and phase coordinates for both analytical models and experiments, which give a more intuitive way to calculate the beam core brightness.
