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X-ray Thomson scattering measurements of temperature and density from multi-shocked CH capsulesa)
a)Paper NI2 5, Bull. Am. Phys. Soc. , 202 (2012).
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View: Figures


Image of FIG. 1.
FIG. 1.

Previously published studies of single shock compressed CH foils. Calculated Hugoniot curve for three-shocked compressed CH capsule.

Image of FIG. 2.
FIG. 2.

The experimental setup to study spherically convergent coalescing shocks in CH capsules; (a) schematic diagram of the target geometry, laser beam configuration, and k-vectors; (b) photo of CH cone-in-half-shell target; (c) 2-D HELIOS simulation of the mass density is shown as a function of CH shell radius and input pulse shape dimensions (TW and time duration) along with shock conditions explained in this study.

Image of FIG. 3.
FIG. 3.

Thomson scattering curve fit analysis. Measured scattered spectra (blue) and best fit (red) to the Compton x-ray scatter features from multi-shocked CH ablators at t = 3.4 ns, 3.5 ns, 3.6 ns, and 3.8 ns, yielding n, T for Z = 4.

Image of FIG. 4.
FIG. 4.

RMS fit of the full ray Thomson scattered spectrum (inelastic and elastic feature) for CH x-ray scattering data taken at t = 3.4 ns (400 ps after shock coalescence) indicating that single shot data from coalescing shocks provide accurate characterization with 15%–20% error bar.

Image of FIG. 5.
FIG. 5.

Calculated Thomson scattering profile calculated with (a) form factor approximation and (b) impulse approximation bound-free models for ionization states of Z = 2 and Z = 4.

Image of FIG. 6.
FIG. 6.

Direct measurements of the (a) mass density, (b) electron temperature, and (c) electron density, inferred from spectrally resolved x-ray Thomson scattering plotted as a function of time (using bound-free models IA and FFA). Data points are plotted with 2-D hydrodynamic simulation (HYDRA) of multi-shocked compressed CH capsules.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: X-ray Thomson scattering measurements of temperature and density from multi-shocked CH capsulesa)