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Michel Busquet

Publications and source records attributed to Michel Busquet.

7 recordsLinked to original sources
arXiv2014

Reply to Reply and Further Analysis of paper "New probing techniques of radiative shocks" (C. Stehle et al, Opt.Comm. 285, 64 (2012))

We show in this paper that the "reply to comment" by Chantal Stehlé et al was not satisfactorily and is contradictory to their latest results. The analysis of the published results of their last campaign reveals an average shock velocity below 20 km/s which should not be compatible with the existence of a radiative precursor. Furthermore, XUV probing is sensitive to density more than to temperature and is not suited to probe a radiative precursor, which is a pure temperature wave. These results also suggest exploding back layers of the pusher and some jet originating from a crater at the back of the pusher.

astro-ph.IM↗
arXiv2012

Comment on "New probing techniques of radiative shocks, by C.Stehle et al"

In this comment, we discuss the possibility of imaging the radiative precursor of a strong shock with a 21.2 nm soft x-ray laser probe and we analyze the data presented in C.Stehle et al "New probing techniques of radiative shocks", (Optics Communications 285, 64, 2012) in order to derive some estimation of the achieved resolution. We show that the presented results are inconclusive for the existence of a radiative precursor. Furthermore, our best estimation of cold and warm Xenon VUV opacities tells that 21.2 nm backlighting would not be able to probe this radiative precursor.

astro-ph.IM↗
arXiv2012

Virtual Spectro, a tool for spectroscopic signatures of plasma

We present here the tool "Virtual Spectro", a post-processor for spectroscopics analysis of hydrodynamic codes. We describe purpose and method of this tool, and the first application to analysis of high energy laser driven radiative shocks.

astro-ph.SR↗
arXiv2011

Effect of incoming radiation on the non-LTE spectrum of Xe at Te = 100 eV

The effect of a diluted Planckian radiation field on a Xe gas at the electron temperature of 100 eV is investigated within the framework of a Collisional Radiative Model, using the HULLAC code. The atomic model spans 19 charge states, includes 20 375 configurations and contains more than 2 10^6 levels. We have simulated detailed spectra comprising more than 10^9 transitions with the Mixed UTA model. The radiation temperature Tr is varied from 0 to 1.5 Te. The dilution factor, D, applied to decrease the radiation field, is varied independently from 0 to 3 at fixed Tr = Te. In both cases, the average charge state Z* increases from 15 to 27, but in different ways. It is shown that even a dilution D = 0.01 changes Z* by more than 1.5. Different combinations of Tr and D yielding exactly the same Z*, may give line ratios sufficiently different to be observed. This fact is explained by the interplay of the shape of the radiation field and the atomic structure.

physics.atom-ph↗
arXiv2010

Miniature shock tube for laser driven shocks

We describe in this paper the design of a miniature shock tube (smaller than 1 cm3) that can be placed in a vacuum vessel and allows transverse optical probing and longitudinal backside XUV emission spectroscopy. Typical application is the study of laser launched radiative shocks, in the framework of what is called "laboratory Astrophysics".

physics.ins-det↗