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X-ray source development for EXAFS measurements on the National Ignition Facility
F Coppari1, D B Thorn1, G E Kemp1
1Lawrence Livermore National Laboratory, Livermore, California 94550, USA.
The Review of Scientific Instruments
|September 3, 2017
Summary
Bright X-ray sources for Extended X-ray absorption Fine Structure (EXAFS) measurements were generated using laser-driven capsule implosions at the National Ignition Facility (NIF). Optimization requirements for these EXAFS measurements were established.
Area of Science:
- Plasma Physics
- Materials Science
- X-ray Spectroscopy
Background:
- Extended X-ray absorption Fine Structure (EXAFS) measurements demand high-quality X-ray sources.
- Laser-driven capsule implosions offer a potential method for generating such X-ray sources.
Purpose of the Study:
- To optimize X-ray emission from laser-driven capsule implosions for EXAFS.
- To establish requirements for generating suitable X-ray sources at the National Ignition Facility (NIF).
Main Methods:
- Testing various capsule types and laser irradiation parameters at NIF.
- Utilizing a crystal spectrometer to disperse X-rays.
- Employing image plate detectors to measure absorption spectra in transmission geometry.
Main Results:
- Achieved first-time EXAFS measurements at the K-edge of iron under ambient conditions using the NIF laser.
- Identified key parameters for optimizing X-ray emission for EXAFS applications.
Conclusions:
- Laser-driven capsule implosions at NIF can produce X-ray sources suitable for EXAFS.
- The study established crucial requirements for optimizing X-ray generation for EXAFS measurements.
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