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

GUO Yu-Xian; XU Peng-Shou

doi:10.1088/1674-1137/37/12/128002

Chinese Physics C> 2013, Vol. 37> Issue(12) : 128002 DOI: 10.1088/1674-1137/37/12/128002

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

GUO Yu-Xian ^, ,
XU Peng-Shou

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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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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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通讯作者: 陈斌, bchen63@163.com

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沈阳化工大学材料科学与工程学院沈阳 110142

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

Corresponding author: GUO Yu-Xian,

Received Date: 2013-03-13

Accepted Date: 2013-05-03

Available Online: 2013-12-05

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

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