光子束位置对SXMCD终端入射SR强度的影响
Influence of the photon beam position on incident SR intensity at SXMCD endstation
摘要：
光子束位置的微小波动会影响同步辐射（SR）通过相应光束线进入终端站时的强度和偏振特性。本文通过改变垂直方向上的电子轨道平衡位置，测量了在不同斩波器孔径位置上，金网SR吸收强度的相应变化。结果表明，在3个光阑位置下，金网的吸收强度随光子束位置的变化呈现良好的高斯分布，而通过上下光阑的SR强度之比呈现单调变化。这提出了一种新的方法来估计圆极化度的SR起源于偏转磁铁的基础上，我们的电流测量。
英文摘要：
A small fluctuation of the photon beam position will affect the characteristics of the synchrotron radiation (SR) intensity and polarization when it enters the end-station through the related beamline. In this paper, by changing the electron orbit equilibrium position in the vertical direction, we have measured the corresponding changes in the absorption strength of the SR with a gold mesh in different chopper aperture positions. It is found that for three aperture positions, the absorption intensity of the gold mesh shows a good Gaussian distribution as the photon beam position moves, while the ratio of the SR intensity passing through the upper and lower apertures shows a monotonous variation. This suggests a new method for estimating the circular polarization degree of SR originating from the bending magnet based on our current measurement.
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