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Dans le cadre du projet Simulation du CEA/DAM, l'acces experimental aux hautes densites d'energie et au domaine de la fusion thermonucleaire en Laboratoire se fera par le Laser Megajoules (LMJ) dont le prototype LIL est en cours de construction au CEA/CESTA pres de Bordeaux. Les programmes experimentaux correspondants ont necessite des performances elevees et le developpement d'une instrumentation de premier plan. C'est notamment le cas des diagnostics plasma qui ont evolue avec le developpement des lasers de puissance et celui des technologies adaptees pour etudier leur comportement. Le Service Diagnostics Experimentaux du CEA/Bruyeres-Le-Chatel developpe des diagnostics et integre la metrologie associee dans la conception de diagnostics. Nous presentons les moyens dont on dispose aupres du rayonnement synchrotron pour la metrologie des diagnostics et l'interet de cette metrologie pour l'etude des plasmas-laser.

The feasibility of efficient X-ray sources for radiography on the LMJ (Laser MegaJoule) in the multi-kJ/ns range was demonstrated on the OMEGA laser facility (Univ. Rochester) from 2002 to 2004 [1,2]. We significantly enhanced the conversion efficiency of titanium (4–6 keV), copper (8–10 keV) and germanium (9–13 keV) foils by using an optimized pre-pulse/pulse combination. Since higher X-ray energy and therefore electronic temperature need hydroconfinement, plastic cylindrical hohlraums internally coated with titanium, copper and germanium with various OMEGA beam configurations were successfully tested from 2005 to 2009 [3–5]. In addition, many shots with metal-doped aerogel (Ti, Fe, Ge) were tested on OMEGA [6].Recently we tested a new concept of “HYBRID sources” based on the combination of a thin titanium foil at the exit hole of a plastic cylinder filled with very low density SiO 2 aerogel (2 and 5 mg/cc). The benefit of the underdense medium is, first, to transport the laser energy to the titanium foil after its conversion into a supersonic ionization front and, second, to prevent foil expansion and excessive kinetic energy losses by longitudinal hydroconfinement.

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 multi-keV 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 (ρ, Te) values contributing to the multi-keV production with several non-local-thermal-equilibrium (NLTE) atomic physics models.

We use the LIL (Ligne d'Integration Laser ) facility to study the coalescence of two planar shocks in an indirectly-driven planar sample of polystyrene. This experiment represents the preliminary stage of the future shock-timing campaign for the Laser Megajoule (LMJ). The main objectives are to validate the experimental concept and to test the numerical simulations. We used a gold spherical hohlraum to convert into X-ray the 351 nm wavelength laser pulse and to initiate the two shocks in the sample. To access time resolved shock velocities and temperature, we used two rear-side diagnostics: a VISAR (Velocity Interferometer System for Any Reflection) working at two different wavelengths and a streaked optical self-emission diagnostic. We observed the coalesced shock, in good agreement with the numerical simulations. We also observed a loss of signal during the first nanoseconds probably due to sample heating from the hohlraum X-ray flux.

En 2011, une campagne experimentale dediee a l'etude des sources X a eu lieu sur la LIL. Son objectif principal etait de mesurer l'energie X emise dans la bande K par des feuilles metalliques irradiees par le quadruplet LIL. Les materiaux utilises etaient le titane, le fer, le cuivre, le zinc et le germanium qui permettent de couvrir la gamme d'energie ∼ (4,7–10,5) keV pour les besoins radiographiques. Deux series de tirs, a des energies delivrees sur cible de ∼5 kJ et ∼10 kJ, ont ete realisees. Les premiers resultats experimentaux, ainsi que leur comparaison avec ceux de simulations effectuees avec le code d'hydrodynamique radiative FCI2, sont presentes.

Nous decrivons les premiers diagnostics X developpes actuellement pour le LMJ. Ceux-ci sont principalement dedies a la qualification de l’installation (mesure de tache focale, controle du pointage et de l’equilibrage des faisceaux), mais egalement au diagnostic de la cavite, du transfert radiatif (mesure de rendement de conversion X), au diagnostic de l’hydrodynamique (experiences de radiographie d’instabilites hydrodynamiques) et a l’imagerie de microballons DT. Ce premier lot de diagnostics comprend deux systemes de multi imagerie X bidimensionnelle associes a un tube obturateur et un systeme d’imagerie monodimensionnelle avec une camera a balayage de fente. Ces trois systemes d’imagerie X appeles « imageurs X » mesurent le rayonnement dans le domaine [500 eV–15 keV]. Un diagnostic de spectrometrie X large bande fonctionnant dans le domaine [30 eV–20 keV] est egalement developpe. Le design des diagnostics prend en compte les problematiques de vulnerabilite aux produits de tirs, de durcissement aux X-durs, gammas et neutrons, de contamination au tritium. Les contraintes liees a l’exploitation sont egalement considerees puisque l’intervention humaine au sein des diagnostics doit etre limitee au cours d’une campagne d’experiences. Les concepts retenus pour ces diagnostics sont presentes, de meme que la caracterisation d’une premiere maquette de microscope de multi imagerie X.

In preparation of the first ignition attempts on the Laser Megajoule (LMJ), an experimental program is being pursued on OMEGA to investigate LMJ-relevant hohlraums. First, radiation temperature levels close to 300 eV were recently achieved in reduced-scale hohlraums with modest backscatter losses. Regarding the baseline target design for fusion experiments on LMJ, an extensive experimental database has also been collected for scaled implosions experiments in both empty and gas-filled rugby-shaped hohlraums. We acquired a full picture of hohlraum energetics and implosion dynamics. Not only did the rugby hohlraums show significantly higher x-ray drive energy over the cylindrical hohlraums, but symmetry control by power balance was demonstrated, as well as high-performance D2 implosions enabling the use of a complete suite of neutrons diagnostics. Charged particle diagnostics provide complementary insights into the physics of these x-ray driven implosions. An overview of these results demonstrates our ability to control the key parameters driving the implosion, lending more confidence in extrapolations to ignition-scale targets.