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Related Experiment Video

Updated: Nov 28, 2025

$Synchrotron X-ray Microdiffraction and Fluorescence Imaging of Mineral and Rock Samples$

Synchrotron X-ray Microdiffraction and Fluorescence Imaging of Mineral and Rock Samples

Published on: June 19, 2018

Quantitative X-ray Channel-Cut Crystal Diffraction Wavefront Metrology Using the Speckle Scanning Technique.

Lian Xue¹, Hongxin Luo¹, Qianshun Diao^2,3

¹Shanghai Synchrotron Radiation Facility, Shanghai Advanced Research Institute, Chinese Academy of Sciences, Shanghai 201800, China.

Sensors (Basel, Switzerland)

|November 25, 2020

Summary

A new speckle-based X-ray diffraction method precisely measures channel-cut crystal slope errors. This technique offers high angular sensitivity and aids in improving crystal fabrication for advanced X-ray applications.

Keywords:

X-ray crystal diffraction wavefront channel-cut crystal speckle-based method

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Last Updated: Nov 28, 2025

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Area of Science:

Optics and X-ray Physics
Materials Science and Engineering

Background:

Accurate measurement of X-ray crystal wavefronts is crucial for high-resolution diffraction applications.
Channel-cut crystals are essential optical components in X-ray beamlines, but their surface characteristics affect performance.
Existing methods for measuring crystal slope errors can lack the required sensitivity or resolution.

Purpose of the Study:

To implement and validate a speckle-based method for measuring X-ray crystal diffraction wavefronts.
To quantify the slope errors of channel-cut crystals with varying surface properties.
To assess the potential of this method for improving crystal fabrication and enabling new X-ray applications.

Main Methods:

A speckle scanning technique was employed, utilizing a scattering membrane moved by a piezo motor.
X-ray deflection caused by channel-cut crystals was inferred from the speckle pattern.
High angular sensitivity in both tangential and sagittal directions was achieved.

Main Results:

The speckle-based method successfully measured slope errors in channel-cut crystals.
Measured slope errors ranged from 0.25 to 2.98 μrad, depending on the crystal's cutting and etching process.
Wavefront deformation data was simulated for beamline integration.

Conclusions:

The implemented speckle-based method provides a sensitive tool for X-ray crystal diffraction wavefront measurement.
The technique offers valuable feedback for crystal manufacturers to enhance channel-cut fabrication processes.
This method paves the way for novel high-resolution X-ray diffraction applications.