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Angular vibrations of cryogenically cooled double-crystal monochromators.

I Sergueev¹, R Döhrmann¹, J Horbach¹

¹Deutsches Elektronen-Synchrotron, D-22607 Hamburg, Germany.

Journal of Synchrotron Radiation

|September 1, 2016

Summary

Angular vibrations in cryogenically cooled monochromators impact X-ray beam performance, affecting focused beam size and position. This study quantifies these effects and vibration measurement methods.

Keywords:

X-ray optics compound refractive lens monochromator

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Area of Science:

X-ray optics
Cryogenic systems
Materials science

Background:

Cryogenically cooled monochromators are crucial for high-resolution X-ray applications.
Crystal vibrations can degrade beam quality and experimental accuracy.
Understanding vibration effects is essential for optimizing X-ray beamlines.

Purpose of the Study:

To investigate the impact of crystal angular vibrations on X-ray beam performance in cryogenically cooled monochromators.
To develop a theoretical model relating vibration amplitude to focused beam characteristics.
To experimentally validate the theoretical model and present characteristic vibration data.

Main Methods:

Theoretical modeling of vibration effects on focused beam size and position.
Experimental measurements using X-ray beams to detect and quantify vibrations.
Systematic study of angular vibrations at monochromators at the PETRA III light source.

Main Results:

A simple relationship between vibration amplitude and focused beam size was established.
Crystal vibrations were shown to influence both the size and axial position of the X-ray image.
Characteristic amplitudes of angular vibrations for various monochromators were determined.

Conclusions:

Angular vibrations in cryogenically cooled monochromators significantly affect X-ray beam performance.
The developed methods allow for effective measurement and characterization of crystal vibrations.
The findings provide critical data for improving the stability and performance of X-ray beamlines.