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Applying X-ray Imaging Crystal Spectroscopy for Use as a High Temperature Plasma Diagnostic

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X-ray collimation by crystals with precise parabolic holes based on diffractive-refractive optics.

Peter Oberta¹, Peter Mikulík, Martin Kittler

¹Institute of Physics, Academy of Sciences of the Czech Republic, vvi, Na Slovance 2, CZ-18221 Praha 8, Czech Republic. peter.oberta@psi.ch

Journal of Synchrotron Radiation

|April 29, 2011

Summary

This study demonstrates tunable sagittal beam collimation using a novel diffractive-refractive double-crystal monochromator. The experimental results confirm theoretical predictions for precise beam control in X-ray optics.

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Area of Science:

X-ray optics
Diffractive and refractive optics
Crystallography

Background:

Achieving precise control over X-ray beam properties is crucial for advanced scientific applications.
Traditional collimation methods can be complex and limited in tunability.
The development of novel monochromator designs is essential for enhancing experimental capabilities.

Purpose of the Study:

To demonstrate sagittal beam collimation using a novel diffractive-refractive double-crystal monochromator.
To investigate the tunable energy range and performance of the proposed system.
To validate theoretical predictions through experimental measurements.

Main Methods:

Fabrication of two Silicon (Si(333)) crystals with precise parabolic holes.
Arrangement of crystals in a dispersive (+,-,-,+) configuration for sagittal collimation.
Experimental study at the European Synchrotron Radiation Facility (ESRF) BM05 beamline using 8.97 keV X-rays.

Main Results:

Successful demonstration of sagittal beam collimation with the double-crystal setup.
Experimental measurements of beam profiles at various distances showed good agreement with theoretical calculations.
The system demonstrated tunable collimation within the predicted energy range of 6.3-18.8 keV.
Observed overlap of the collimated (333) beam by horizontally diverging (444) and (555) beams due to insufficient harmonic suppression.

Conclusions:

The novel diffractive-refractive double-crystal monochromator effectively achieves tunable sagittal beam collimation.
The experimental validation supports the theoretical framework for this advanced X-ray optics technique.
Further optimization is needed to improve harmonic suppression for cleaner collimated beams.