TUOBM04
SSRF, Shanghai, People’s Republic of China
In order to measure the operando synchrotron radiation crystal monochromator performance, an analysis crystal in the configuration perpendicular to the monochromator is used to carry out the dispersion modulation of the beam in the horizontal direction, so that the 2D spatial distribution of the diffraction spot could have the energy spectrum characteristics. Through analysis of photon numbers in different positions, the spatial distribution of photon flux and peak shift can be obtained to characterize the changes in the beam energy spectrum which can quantitatively reflect the characteristics of the monochromator. In this paper, a special detecting system consisting of an orthogonal analyzer and a 2D imaging camera was used to analyze the spectrum characteristics of beam variation, which could be used to quantitatively measure the energy bandwidth of monochromator, the thermal deformation of crystal and the stability of beam angle. The spectral resolution of the system is only determined by the pixel size of the imaging camera. The quantitative characterization of operando monochromator performance is realized, which provides data support for beamline performance optimization.
