Recent progress in metal-lined cylindrical as efficient x-ray sources

Primout, M.; Jacquet, L.; Babonneau, D.; Girard, Frédéric; Villette, B.; Jadaud, J. P.; Naudy, M.; Stemmler, P.; Ulmer, John L.

doi:10.1088/1742-6596/112/4/042051

Cited by 14 publications

(9 citation statements)

References 6 publications

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“…Thus, the laser beam supersonically and volumetrically heats the low-density material on a time scale shorter than the time scale for the rarefaction wave to decompress and cool the plasma, providing much higher x-ray conversion efficiency (XRCE) in the non-LTE plasma than is obtained by simply irradiating solid targets [4,5,6]. Under-dense high-Z radiators have been confined in the past mainly to high-Z noble gases (Ar, Kr, and Xe) [7,8,9], but some efficient Ti x-ray sources (K-shell emission ~ 4 keV) have also been created with nano-fiber targets [10]; with pre-pulsed Ti, Cu, and Ge foils (K-shell emission ~ 4 keV, ~8 keV, and ~10 keV respectively) [11,12]; and by irradiating the inside surface of Ti-and Ge-lined cans [13,14].…”

Section: Introductionmentioning

confidence: 99%

A computational study of x-ray emission from high-Z x-ray sources on the National Ignition Facility laser

Colvin

Fournier

Kane

et al. 2011

High Energy Density Physics

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We have begun to use 350-500 kJ of 1/3-micron laser light from the National Ignition Facility (NIF) laser to create millimeter-scale, bright multi-keV x-ray sources. In the first set of shots we achieved 15% -18% x-ray conversion efficiency into Xe M-shell (~1.5-2.5 keV), Ar K-shell (~3 keV) and Xe L-shell (~4-5.5 keV) emission (Fournier et al., Phys. Plasmas 17, 082701, 2010), in good agreement with the emission modeled using a 2D radiation-hydrodynamics code incorporating a modern Detailed Configuration Accounting atomic model in non-LTE (Colvin et al., Phys. Plasmas, 17, 073111, 2010). In this paper we first briefly review details of the computational model and comparisons of the simulations with the Ar/Xe NIF data. We then discuss a computational study showing sensitivity of the x-ray emission to various beam illumination details (beam configuration, pointing, peak power, pulse shape, etc.) and target parameters (size, initial density, etc.), and finally make some predictions of how the x-ray conversion efficiency expected from NIF shots scales with atomic number of the emitting plasma.

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Section: Introductionmentioning

confidence: 99%

A computational study of x-ray emission from high-Z x-ray sources on the National Ignition Facility laser

Colvin

Fournier

Kane

et al. 2011

High Energy Density Physics

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“…La ∼ 6.4 kJ pour les cibles irradiées d'un seul côté. Une énergie de ∼13 kJ a été délivrée à la cible irradiée de façon bilatérale [10].…”

Section: Les Cavités Tapissées De Métalunclassified

Sources X : du multi-keV-ns au multi-MeV-ps

Primout

Jacquet

Babonneau

et al. 2013

UVX 2012 - 11e Colloque Sur Les Sources Cohérentes Et Incohérentes UV, VUV Et X ; Applications Et Développements Récents

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Résumé. Plusieurs concepts étudiés pour la réalisation des sources X du domaine multi-keV/ns au domaine multi-MeV/ps sont abordés. Ces sources de rayonnement sont développées dans le but de radiographier les cibles sur le Laser Mégajoule (LMJ). Pour valider ces concepts et pour prédimensionner ces sources de radiographie, de nombreuses campagnes expérimentales ont été menées sur des installations comme ALISE, GEKKO XII, OMEGA, OMEGA-EP et LIL.

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“…Two campaigns using titanium (Ti) and germanium (Ge) lined hohlraums were performed on Omega in 2005 and 2007 [7]. The results show systematic large discrepancies between measured and calculated CE's for the titanium targets [8]. 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.…”

Section: Introductionmentioning

confidence: 99%

Multi-keV X-ray sources from metal-lined cylindrical hohlraums

Jacquet

Girard

Villette

et al. 2013

EPJ Web of Conferences

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Abstract. In 2009 a series of metal-lined hohlraums were tested on the Omega laser facility. The main aims of the campaign were to improve our understanding of the multi-keV energy production and our capability to numerically reproduce the measured conversion efficiencies (CE's). Two studies have been primarily planned: the effect of the metallic plasma mean ionization states and that of hydrodynamics. Six targets were experimented for which the metallic materials (titanium, copper, germanium), the cavity diameter, and the irradiation energy were varied. Here we compare experimental and calculated results. The numerical simulations are performed with the 2D hydro-radiative code FCI2. For all the cavities, the measured multikeV x-ray powers versus time are qualitatively well reproduced by the simulations, indicating that hohlraum hydrodynamics seems to be well calculated. But we have an underestimation by a factor of ∼2 for the calculated CEs versus experimental values for titanium and copper hohlraums. By contrast there is a good agreement between measurements and calculations for the germanium hohlraum. To explain these results, we have calculated off-line integrated emissivities for couples of ( , Te) values contributing to the multi-keV production with several non-local-thermal-equilibrium (NLTE) atomic physics models.

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Recent progress in metal-lined cylindrical as efficient x-ray sources

Cited by 14 publications

References 6 publications

A computational study of x-ray emission from high-Z x-ray sources on the National Ignition Facility laser

A computational study of x-ray emission from high-Z x-ray sources on the National Ignition Facility laser

Sources X : du multi-keV-ns au multi-MeV-ps

Multi-keV X-ray sources from metal-lined cylindrical hohlraums

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