Abstract
As multi-keV x-ray sources, plastic hohlraums with inner walls coated with titanium, copper, and germanium have been fired on Omega in September 2009. For all the targets, the measured and calculated multi-keV x-ray power time histories are in a good qualitative agreement. In the same irradiation conditions, measured multi-keV x-ray conversion rates are ∼6%-8% for titanium, ∼2% for copper, and ∼0.5% for germanium. For titanium and copper hohlraums, the measured conversion rates are about two times higher than those given by hydroradiative computations. Conversely, for the germanium hohlraum, a rather good agreement is found between measured and computed conversion rates. To explain these findings, multi-keV integrated emissivities calculated with RADIOM [M. Busquet, Phys. Fluids 85, 4191 (1993)], the nonlocal-thermal-equilibrium atomic physics model used in our computations, have been compared to emissivities obtained from different other models. These comparisons provide an attractive way to explain the discrepancies between experimental and calculated quantitative results.
Highlights
Multi-keV x-ray sources are required for diagnostics of inertial confinement fusion (ICF) experiments and material testing
We have successfully tested a new series of metal-lined cavities on Omega in 2009
A rather good qualitative agreement is obtained between diagnostic data and simulation results for time-dependant x-ray powers and images, indicating that the cavity hydrodynamics seems to be well calculated
Summary
Multi-keV x-ray sources are required for diagnostics of inertial confinement fusion (ICF) experiments and material testing. To improve the CE’s, new source principles have been considered as metal-doped aerogel targets [4, 5], pre-pulsed thin metallic foils [6] and metal-lined hohlraums which are plastic cylinders coated with metallic materials. A new campaign has been carried out in 2009 on Omega with the aim of studying and improving our capability to reproduce x-ray production of such metal-lined sources with our numerical tools and physical models. We had imaging systems, XRFC and XRPHC, to observe the x-ray emission volumes with and without temporal resolution
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