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Related Experiment Video

Updated: May 30, 2026

Measurement of X-ray Beam Coherence along Multiple Directions Using 2-D Checkerboard Phase Grating
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A new beamstop for microfocus X-ray capillary beams.

Ulrich Englich1, Peter Revesz, William Miller

  • 1Cornell University, Macromolecular Diffraction at CHESS (MacCHESS), Cornell High Energy Synchrotron Source, Ithaca, NY 14853.

Nuclear Instruments & Methods in Physics Research. Section A, Accelerators, Spectrometers, Detectors and Associated Equipment
|August 9, 2011
PubMed
Summary

A novel beam stop device uses a cadmium tungstate crystal and photodiode to measure X-ray flux and aid beam alignment. This integrated system stops X-rays while monitoring intensity, simplifying experimental setups.

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Area of Science:

  • Physics
  • Materials Science
  • Instrumentation

Background:

  • Accurate measurement of photon flux is crucial for X-ray experiments.
  • Traditional methods for monitoring X-ray intensity can be complex and require integration into beamlines.

Purpose of the Study:

  • To design and implement a modified beam stop device for simultaneous X-ray beam attenuation and intensity monitoring.
  • To eliminate the need for separate integrating ion chambers in X-ray setups.

Main Methods:

  • Integration of a cadmium tungstate (CdWO4) crystal within a beam stop.
  • Utilizing the photoluminescence produced by the crystal when exposed to X-rays.
  • Employing a photosensitive diode and a flexible light pipe to detect and quantify the photoluminescence, correlating it to X-ray flux.

Main Results:

  • The developed beam stop effectively attenuates the primary X-ray beam.
  • Photoluminescence intensity from the CdWO4 crystal is directly proportional to the X-ray flux.
  • The device successfully monitors X-ray intensity in real-time.

Conclusions:

  • The modified beam stop device provides an efficient method for measuring photon flux.
  • This integrated approach simplifies experimental setups by combining beam stopping and intensity monitoring functions.
  • The device offers a viable alternative to conventional ion chambers for X-ray flux measurements.