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An improved high luminosity, easily spectrally tunable backlighting scheme based on a spherically bent crystal is considered in this paper. Contrary to the traditional backlighting scheme, we used crystal far from normal incidence, and the backlighter source was inside the Rowland circle. With the presented configuration, we obtained a spatial resolution up to 8 µm in the desired direction with an X-ray backlighting energy close to 5 keV. Detailed discussions and ray-tracing calculations show that with this convenient scheme resolution down to 5 µm can be achieved. A dedicated application to high energy density physics is presented: the radiography of shock compressed matter.
In this article, we present a laboratory astrophysics experiment
on radiative shocks and its interpretation using simple modelization.
The experiment is performed with a 100-J laser (pulse duration of about
0.5 ns) which irradiates a 1-mm3 xenon gas-filled cell.
Descriptions of both the experiment and the associated diagnostics
are given. The apparition of a radiation precursor in the unshocked
material is evidenced from interferometry diagrams. A model
including self-similar solutions and numerical ones is derived
and fairly good agreements are obtained between the theoretical
and the experimental results.
We have studied the interaction of soft X-ray thermal radiation
with foam-layered metal targets. The X-radiation was produced
by focusing a high energy laser inside a small size hohlraum.
An increment in shock pressure was observed with the foam layer
as compared to bare metal targets.
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