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Synchrotron X-ray Microdiffraction and Fluorescence Imaging of Mineral and Rock Samples
Published on: June 19, 2018
X-ray focusing using microchannel plates
Applied Optics
|August 31, 2010
Summary
Measurements of square-pore microchannel plates (MCPs) reveal surface roughness and channel misalignment limit x-ray focusing capabilities. These findings are crucial for advancing grazing incidence x-ray optics applications.
Area of Science:
- Optics
- Materials Science
- Astrophysics
Background:
- Microchannel plates (MCPs) are essential components in grazing incidence x-ray optics.
- Optimizing MCP surface properties is critical for enhancing x-ray focusing performance.
Purpose of the Study:
- To measure the x-ray focusing properties of square-pore MCPs.
- To characterize the surface microroughness and geometric alignment of MCP channels.
Main Methods:
- Utilized profilometry to measure surface microroughness along and transverse to MCP channel axes.
- Analyzed the spatial frequency and autocorrelation of surface roughness.
- Assessed the impact of geometric misalignments on angular resolution.
Main Results:
- Identified high microroughness (5.9 nm rms) transverse to the channel axis, with a Gaussian autocorrelation function (1.41 micrometer correlation length).
- Found low microroughness parallel to the channel axis.
- Determined that geometric misalignments limit angular resolution to 7.1 arcminutes.
Conclusions:
- Square-pore MCPs exhibit surface characteristics that influence their x-ray focusing capabilities.
- Channel misalignments are a primary limitation for achieving high angular resolution in current MCP samples.
- Further research into MCP fabrication and alignment is needed for improved x-ray optic performance.
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