Performance of a cryo-cooled crystal monochromator illuminated by hard X-rays with MHz repetition rate at the European X-ray Free-Electron Laser

TL;DR

This paper investigates how heat load impacts the performance of a cryo-cooled crystal monochromator exposed to high-repetition-rate X-ray pulses at the European XFEL, combining experimental data with a comprehensive diffraction model.

Contribution

It provides experimental validation of a depth-uniform diffraction model accounting for heat deformation in cryogenic monochromators under intense X-ray irradiation.

Findings

Heat load significantly affects monochromator performance.

Experimental results align with the depth-uniform diffraction model.

Heat deformation must be considered for optimal monochromator design.

Abstract

We present experimental data illustrating how heat load affects the performance of a cryogenically cooled monochromator under intense X-ray Free-Electron Laser pulses. The measurements are in good agreement with a depth-uniform model of X-ray dynamical diffraction taking beam absorption and heat deformation of the crystals into account.