Abstract
We measured the spectral and spatial intensity distributions of synchrotron radiation (SR) in the soft x-ray region using an energy-dispersive method with a Si(Li) detector at the Photon Factory. By measuring the intensity of x rays scattered by helium gas, we could reduce the high SR intensity to the sensitivity range of a Si(Li) detector and, by selecting the scattering angle, we used this method as a polarimeter. In the soft x-ray region above 2 keV, the measured spectral and spatial profiles of the direct beam transmitted through a Be window were almost the same as the calculated values, but absolute intensity was about 30% less than calculated. This is largely due to the geometric errors of the measuring system. We also measured the intensity distribution of the beam reflected from fused quartz mirrors. The spectrum profiles agreed with the calculated values, but absolute intensity was somewhat less than expected, and the spatial distribution had a complicated profile because of imperfections in the mirrors.
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