X射线偏振诊断中横向位置监测与补偿的数值研究
Numerical study of transverse position monitor and compensation for x-ray polarization diagnosis
摘要：
自由电子激光（FEL）偏振态的诊断对于X射线自由电子激光（XFEL）衍射成像和材料磁性探测等偏振调制研究具有重要意义。基于X射线偏振测量技术，设计了一种用于现场诊断的电子飞行时间（eTOF）偏振仪，测量了光电子的飞行时间和角分布。然而，X射线自由电子激光脉冲的横向位置会给测量的光电子角分布带来误差。因此，这项工作提出了一种方法来监测的横向位置，使用eTOF偏振仪，并解释了如何补偿由于横向位置的误差。数值模拟结果表明，采用全极化FEL脉冲，空间分辨率可达2 0 \(μ\) m，极性可提高0.5%.文中还讨论了FEL脉冲的影响和校准其线性度的方法。
英文摘要：
Diagnosing free electron laser (FEL) polarization is critical for polarization-modulated research such as x-ray free electron laser (XFEL) diffraction imaging and probing material magnetism. In an electron time-of-flight (eTOF)\ polarimeter, the flight time and angular distribution of photoelectrons were designed based on x-ray polarimetry for on-site diagnosis. However, the transverse position of x-ray FEL pulses introduces error into the measured photoelectron angular distribution. This work thus proposes a method to monitor the transverse position using an eTOF polarimeter and explains how to compensate for the error due to transverse position. A comprehensive numerical model is developed to demonstrate the feasibility of the compensation method, and the results reveal that a spatial resolution of 20 \(μ\)m and a polarity improved by 0.5\% is possible with fully polarized FEL pulses. The impact of FEL\ pulses and a method to calibrate their linearity is also discussed.
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