An x-ray backlit Talbot-Lau deflectometer for high-energy-density electron density diagnostics
- Johns Hopkins Univ., Baltimore, MD (United States). Department of Physics and Astronomy
- Univ. of Rochester, NY (United States). Lab. for Laser Energetics
X-ray phase-contrast techniques can measure electron density gradients in high-energy-density plasmas through refraction induced phase shifts. An 8 keV Talbot-Lau interferometer consisting of free standing ultrathin gratings was deployed at an ultra-short, high-intensity laser system using K-shell emission from a 1-30 J, 8 ps laser pulse focused on thin Cu foil targets. Grating survival was demonstrated for 30 J, 8 ps laser pulses. The first x-ray deflectometry images obtained under laser backlighting showed up to 25% image contrast and thus enabled detection of electron areal density gradients with a maximum value of 8.1 ± 0.5 × 1023 cm₋3 in a low-Z millimeter sized sample. An electron density profile was obtained from refraction measurements with an error of <8%. We found the 50 ± 15 μm spatial resolution achieved across the full field of view was limited by the x-ray source-size, similar to conventional radiography.
- Research Organization:
- Johns Hopkins Univ., Baltimore, MD (United States). Dept. of Physics and Astronomy
- Sponsoring Organization:
- USDOE National Nuclear Security Administration (NNSA)
- Grant/Contract Number:
- NA0001835; DENA0001835
- OSTI ID:
- 1258591
- Alternate ID(s):
- OSTI ID: 1237775
- Journal Information:
- Review of Scientific Instruments, Vol. 87, Issue 2; ISSN 0034-6748
- Publisher:
- American Institute of Physics (AIP)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
Web of Science
X-ray backlighter requirements for refraction-based electron density diagnostics through Talbot-Lau deflectometry
|
journal | October 2018 |
Talbot–Lau x-ray deflectometry phase-retrieval methods for electron density diagnostics in high-energy density experiments
|
journal | January 2018 |
Advanced high resolution x-ray diagnostic for HEDP experiments
|
journal | November 2018 |
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