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- The text discusses a new four-color X-ray microscope designed for diagnosing the imploding core in laser inertial confinement fusion, utilizing a Kirkpatrick-Baez configuration.
- This microscope employs single-layer and periodic multilayer film mirrors and provides excellent spatial and spectral resolution in the medium-to-high-energy X-ray range.
- Laboratory tests showed it achieved impressive spatial resolutions of around 3.7 to 4.1 µm at specific energy levels, confirming its effectiveness through a spectral calibration experiment.
Time-resolved X-ray diffraction diagnostic development for the National Ignition Facility.
Rev Sci Instrum
January 2024
Lawrence Livermore National Laboratory, Livermore, California 94550, USA.
We present the development of an experimental platform that can collect four frames of x-ray diffraction data along a single line of sight during laser-driven, dynamic-compression experiments at the National Ignition Facility. The platform is comprised of a diagnostic imager built around ultrafast sensors with a 2-ns integration time, a custom target assembly that serves also to shield the imager, and a 10-ns duration, quasi-monochromatic x-ray source produced by laser-generated plasma. We demonstrate the performance with diffraction data for Pb ramp compressed to 150 GPa and illuminated by a Ge x-ray source that produces ∼7 × 1011, 10.
View Article and Find Full Text PDFMonte Carlo simulations of synchrotron X-ray dose affecting root growth during in vivo tomographic imaging.
Sci Rep
April 2023
Brazilian Synchrotron Light Laboratory (LNLS), Brazilian Center for Research in Energy and Materials (CNPEM), Campinas, Sao Paulo, 13083-970, Brazil.
Synchrotron X-ray computed tomography (XCT) has been increasingly applied to study the in vivo dynamics of root growth and rhizosphere processes. However, minimizing radiation-induced damage to root growth warrants further investigation. Our objective was to develop a robust approach for modeling and evaluating ways to reduce synchrotron X-ray dose effects on root growth during in vivo imaging.
View Article and Find Full Text PDFOptimized x-ray emission from 10 ns long germanium x-ray sources at the National Ignition Facility.
Rev Sci Instrum
December 2022
Lawrence Livermore National Laboratory, Livermore, California 94550, USA.
This study investigates methods to optimize quasi-monochromatic, ∼10 ns long x-ray sources (XRS) for time-resolved x-ray diffraction measurements of phase transitions during dynamic laser compression measurements at the National Ignition Facility (NIF). To support this, we produce continuous and pulsed XRS by irradiating a Ge foil with NIF lasers to achieve an intensity of 2 × 10 W/cm, optimizing the laser-to-x-ray conversion efficiency. Our x-ray source is dominated by Ge He-α line emission.
View Article and Find Full Text PDFDensity estimations and comparisons of a fragmented single fiber using X-ray computed tomography.
Anal Sci
February 2023
Department of Applied Chemistry, Graduate School of Engineering, Hiroshima University, 1-4-1 Kagamiyama, Higashi-Hiroshima, 739-8527, Japan.
A commercial X-ray computed tomography (CT) apparatus using a quasi-monochromatic beam was utilized for density estimations and comparisons of a fragmented single fiber. The validation of quasi-monochromaticity of the X-ray source was investigated by radiograph measurements. For the case of a transmittance higher than 50%, the contribution of Cu Kα characteristic X-rays was dominant.
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