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A small fluctuation of the photon beam position will affect thecharacteristics of the synchrotron radiation (SR) intensity and polarizationwhen it enters the end-station through the related beamline. In this paper, bychanging the electron orbit equilibrium position in the vertical direction, wehave measured the corresponding changes in the absorption strength of the SRwith a gold mesh in different chopper aperture positions. It is found that forthree aperture positions, the absorption intensity of the gold mesh shows agood Gaussian distribution as the photon beam position moves, while the ratioof the SR intensity passing through the upper and lower apertures shows amonotonous variation. This suggests a new method for estimating the circularpolarization degree of SR originating from the bending magnet based on ourcurrent measurement.

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