Influence of the photon beam position on incident SR intensity at the SXMCD endstation

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GUO Yu-Xian and XU Peng-Shou. Influence of the photon beam position on incident SR intensity at the SXMCD endstation[J]. Chinese Physics C, 2013, 37(12): 128002. doi: 10.1088/1674-1137/37/12/128002
GUO Yu-Xian and XU Peng-Shou. Influence of the photon beam position on incident SR intensity at the SXMCD endstation[J]. Chinese Physics C, 2013, 37(12): 128002.  doi: 10.1088/1674-1137/37/12/128002 shu
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Received: 2013-03-13
Revised: 2013-05-03
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Influence of the photon beam position on incident SR intensity at the SXMCD endstation

    Corresponding author: GUO Yu-Xian,

Abstract: A small fluctuation of the photon beam position will affect the intensity and polarization characteristics of synchrotron radiation (SR) when it enters an endstation 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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