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Synthesis and Microdiffraction at Extreme Pressures and Temperatures
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Long duration x-ray source development for x-ray diffraction at the National Ignition Facility.

K Werellapatha1, G N Hall1, F Coppari1

  • 1Lawrence Livermore National Laboratory, Livermore, California 94550, USA.

The Review of Scientific Instruments
|July 10, 2021
PubMed
Summary
This summary is machine-generated.

Researchers developed a 10 ns quasi-monochromatic X-ray source for time-resolved X-ray diffraction (XRDt) to study laser-driven phase transitions. This new source supports high-speed detectors, enabling detailed analysis of dynamic compression experiments.

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Area of Science:

  • High-energy-density physics
  • Materials science
  • X-ray science

Background:

  • Time-resolved X-ray diffraction (XRDt) requires precise X-ray sources.
  • Laser-driven dynamic compression experiments necessitate short-pulse, monochromatic X-rays.

Purpose of the Study:

  • To create a 10 ns quasi-monochromatic X-ray source.
  • To support high-speed gated hybrid CMOS detectors for XRDt.
  • To enable the study of phase transitions during dynamic compression.

Main Methods:

  • Utilized a laser-irradiated Germanium (Ge) foil to generate X-rays.
  • Employed high-speed (∼1 ns) gated hybrid CMOS detectors.
  • Conducted time-resolved and time-integrated spectral measurements.
  • Performed 1D Cartesian simulations using HYDRA.

Main Results:

  • Successfully produced a 10 ns X-ray source.
  • The X-ray source duration matched the main laser pulse.
  • He-α emission complex dominated the spectra over higher energy lines.
  • Simulations predicted a 0.56% conversion efficiency at 2 × 1015 W/cm2.

Conclusions:

  • The developed X-ray source is suitable for time-resolved XRDt.
  • The source's characteristics align with the requirements of high-speed detectors.
  • Experimental results validate simulation predictions for Ge backlighters.