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.
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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.
Perspectives
This article was the first article I authored as the main author and the collaboration with the other co-authors was very refreshing, due to their huge experience and love for the detail. This made the paper of a quality that I alone would not have been able to achieve. In the end the findings were something that we expected from logical reasoning beforehand. However, the profound work on the paper enabled us to proof the ideas and put numbers behind the theory. This could maybe help other institutes to think about the idea of performance gains by applying the same ideas.
Philipp Brumund
ESRF
Read the Original
This page is a summary of: Design simulations of a horizontally deflecting high-heat-load monochromator, Journal of Synchrotron Radiation, January 2021, International Union of Crystallography,
DOI: 10.1107/s1600577520014009.
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