Polycapillary x-ray lenses for single-shot, laser-driven powder diffraction

Schollmeier, M.; Ao, T.; Field, Ella Suzanne; Galloway, Benjamin; Kalita, Pat; Kimmel, Mark W.; Морган, Д.; Rambo, Patrick K.; Schwarz, Jens; Shores, J. E.; Smith, I. C.; Speas, Christopher; Benage, J.F.; Porter, J. L.

doi:10.1063/1.5036569

Cited by 9 publications

(3 citation statements)

References 18 publications

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“…Therefore, use of an appropriate X-ray optic, which collects and (quasi-)collimates the radiation is mandatory to enable this approach [18][19][20][21][22][23] . Successful application of ultrafast Debye-Scherrer diffraction at a laser-plasma based X-ray source has been recently demonstrated by measuring transient changes of electron density for thick (10 -100 µm) powder samples of ionic crystals 21,24,25 .…”

Section: Introductionmentioning

confidence: 99%

Acoustic response of a laser-excited polycrystalline Au-film studied by ultrafast Debye–Scherrer diffraction at a table-top short-pulse x-ray source

et al. 2020

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The transient acoustic response of a free-standing, polycrystalline thin Au film upon femtosecond optical excitation has been studied by time-resolved Debye-Scherrer X-ray diffraction using ultrashort Cu K α X-ray pulses from a laser-driven plasma X-ray source.The temporal strain evolution has been determined from the transient shifts of multiple Bragg diffraction peaks. The experimental data are in good agreement with the results of calculations based on the two-temperature model and an acoustic model assuming uni-axial strain propagation in the laser-excited thin film.

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Section: Introductionmentioning

confidence: 99%

Acoustic response of a laser-excited polycrystalline Au-film studied by ultrafast Debye–Scherrer diffraction at a table-top short-pulse x-ray source

et al. 2020

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“…In contrast, the spatially incoherent 4π-emission of laserplasma based X-ray sources require optics, which allow to collect the radiation over a sufficiently large solid angle and deliver it to the sample in a suitably shaped beam (focused, collimated). Bent crystals, multi-layer mirrors and capillary optics have been utilized for this purpose 58,59,[75][76][77][78] .…”

Section: X-ray Opticsmentioning

confidence: 99%

Time-resolved diffraction with an optimized short pulse laser plasma X-ray source

Afshari

Krumey

Menn

et al. 2020

Structural Dynamics

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We present a set-up for time-resolved X-ray diffraction based on a short pulse, laser-driven plasma X-ray source. The employed modular design provides high flexibility to adapt the set-up to the specific requirements (e.g. X-ray optics, sample environment) of particular applications. The configuration discussed here has been optimized towards high angular/momentum resolution and uses K α -radiation (4.51 keV) from a Ti wire-target in combination with a toroidally bent crystal for collection, monochromatization and focusing of the emitted radiation. 2 × 10 5 Ti-K α1 photons per pulse with 10 −4 relative bandwidth are delivered to the sample at 10 Hz repetition rate. This allows for high dynamic range (10 4 ) measurements of transient changes of the rocking curves of materials as for example induced by laser-triggered strain waves. PACS numbers: 78.47.J-, 61.05.C, 63.30.dd a) Klaus.Sokolowski-Tinten@uni-due.de

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“…表 1 金属钒 [21] 和铁 [22] 材料性质常数度、准单色的脉冲X射线源 [7] . X射线源的源尺寸和脉冲宽度均与驱动激光焦斑(约300 µm)和脉宽相当(约1 ns), 二者共同决定了原位X射线衍射的时间、空间分辨能力.…”

Section: 由于材料力学特性是进行工程结构安全、可靠unclassified

In situ observation of phase transition in polycrystalline under high-pressure high-strain-rate shock compression by X-ray diffraction

Chen¹,

Tan²,

Xue³

et al. 2020

Acta Phys. Sin.

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The knowledge of phase transition of material under dynamic loading is an important area of research in inertial confinement fusion and material science. Though the shock-induced phase transitions of various materials over a broad pressure range have become a field of study for decades, the loading strain rates in most of these experiments is not more than <inline-formula><tex-math id="M2">\begin{document}$ {10^{6}}\;{{\rm{s}}^{ - 1}} $\end{document}</tex-math><alternatives><graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="24-20200929_M2.jpg"/><graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="24-20200929_M2.png"/></alternatives></inline-formula>. However, in contrast with the strain rate range where the phase diagram is a good predictor of the crystal structure of a material, at higher strain rate (<inline-formula><tex-math id="M3">\begin{document}$ > {10^{6}}\;{{\rm{s}}^{ - 1}} $\end{document}</tex-math><alternatives><graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="24-20200929_M3.jpg"/><graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="24-20200929_M3.png"/></alternatives></inline-formula>) the phase diagram measured can be quite different not only in shifting the boundary line between various phases, but also in giving a different sequence of crystal structure. High-power laser facility can drive shock wave and simultaneously provide a precisely synchronized ultra-short and ultra-intense X-ray source. Here, based on the Prototype laser facility, an in situ X-ray diffraction platform for diagnosing shock-induced phase transition of polycrystalline material is established. The in situ observation of material phase transition under high-strain-rate shock loading is carried out with typical metals of vanadium and iron. Diffraction results are consistent with vanadium remaining in the body-centered-cubic structure up to 69 GPa, while iron transforms from the body-centered-cubic structure into hexagonal-close-packed structure at 159 GPa. The compressive properties of vanadium and iron obtained in in situ X-ray diffraction experiment are in good agreement with their macroscopic Hugonoit curves. The decrease in the lattice volume over the pressure step period yields a strain rate on the order of <inline-formula><tex-math id="M4">\begin{document}$ {10^{8}} - {10^{9}}\;{{\rm{s}}^{ - 1}} $\end{document}</tex-math><alternatives><graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="24-20200929_M4.jpg"/><graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="24-20200929_M4.png"/></alternatives></inline-formula>. The available of the presented in situ X-ray diffraction plateform offers the potential to extend our understanding of the kinetics of phase transition in polycrystalline under high-pressure high-strain-rate shock compression.

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Polycapillary x-ray lenses for single-shot, laser-driven powder diffraction

Cited by 9 publications

References 18 publications

Acoustic response of a laser-excited polycrystalline Au-film studied by ultrafast Debye–Scherrer diffraction at a table-top short-pulse x-ray source

Acoustic response of a laser-excited polycrystalline Au-film studied by ultrafast Debye–Scherrer diffraction at a table-top short-pulse x-ray source

Time-resolved diffraction with an optimized short pulse laser plasma X-ray source

<i>In situ</i> observation of phase transition in polycrystalline under high-pressure high-strain-rate shock compression by X-ray diffraction

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