4th generation synchrotron performance of a horizontally deflecting high-heat load monochromator
What is it about?
High-heat load monochromators are widely used to select a desired x-ray energy out of wide spectrum emitted by synchrotron light sources. For older light sources the use of the vertical deflection geometry was logic, as the alternative horizontal geometry lead to significant flux losses linked to a big source divergence in the horizontal plane. We have shown that for 4th generation synchrotrons such as the ESRF EBS, the use of the horizontal deflecting geometry does lead to low losses in terms of photon flux and preserves the high beam quality in the sagittal, thus vertical direction by means of thermo-mechanical FEA.
Why is it important?
Our investigations reveal that the former almost given rule of the vertical deflection geometry for high-heat-load monochromators is less rigid for 4th generation synchrotrons. This is even more significant if the beam quality in the vertical should be preserved. Then, the use of the horizontal scattering geometry is a good alternative and resulting thermal deformations under normal use have no relevant influence on the vertical beam quality.