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Detailed diffraction imaging of x-ray optics crystals with synchrotron radiation
N R Pereira1, A T Macrander2, E Kasman2
1Ecopulse, Inc., 7844 Vervain Ct, Springfield, Virginia 22152, USA.
The Review of Scientific Instruments
|July 10, 2021
Summary
Rocking curve topography reveals crystal uniformity in thick quartz wafers. However, thin, bendable crystals show non-uniform x-ray reflection, potentially impacting plasma diagnostics applications.
Area of Science:
- Materials Science
- Crystallography
- X-ray Optics
Background:
- Rocking curve topography is a technique for analyzing crystal perfection.
- X-ray diagnostics of plasmas often utilize bent crystals.
Purpose of the Study:
- To investigate the x-ray reflection properties of flat and thin, bendable crystals using rocking curve topography.
- To assess the suitability of current topography methods for analyzing crystals used in plasma diagnostics.
Main Methods:
- Utilized rocking curve topography at the Advanced Photon Source beamline 1-BM.
- Measured x-ray reflection (011̄1) at 8 keV from various quartz crystals.
- Examined both thick, rigid wafers and thin, bendable crystals optically contacted to substrates.
Main Results:
- Thick quartz wafers exhibited uniform x-ray reflection, consistent with theoretical predictions.
- Thin, bendable crystals displayed non-uniform x-ray reflection patterns.
- Optical contacting of thin crystals did not fully resolve reflection non-uniformities.
Conclusions:
- The non-uniformity observed in thin, bendable crystals may affect their performance in x-ray plasma diagnostics.
- Existing topography setups may not achieve the necessary resolution for detailed analysis of bent crystals.
- Microfocusing techniques could offer improved resolution for analyzing bent crystals in future applications.
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