Argon K-shell and bound-free emission from OMEGA direct-drive implosion cores

Florido, R.; Mancini, Roberto; Nagayama, Taisuke; Tommasini, R.; Delettrez, J. A.; Regan, S. P.; Smalyuk, V. A.; Rodríguez, Rafael; Gil, Juan

doi:10.1016/j.hedp.2009.06.011

Cited by 23 publications

(12 citation statements)

References 24 publications

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“…The total radiative power loss is then obtained as the sum of the three contributions. ABAKO and RAPCAL codes have been successfully tested with experimental results and numerical simulations for plasmas of both low and high Z-elements (for example: carbon, aluminium, argon, krypton, xenon or gold), either under LTE or NLTE conditions, in optically thin and thick (homogeneous and non-homogeneous) situations [22,23,25,45] and, recently, it has been proved their utility in K-shell spectroscopic diagnostics of aluminium [46] and argon [47,48] plasmas obtained in experiments carried out at LULI and OMEGA facilities, respectively. With respect to the simulations of xenon plasmas, in a previous work [23] was performed a numerical simulation of an experiment carried out at LULI [49] where an optically thick stationary xenon plasma was obtained.…”

Section: Theoretical Modelmentioning

confidence: 99%

Determination and Analysis of the Thermodynamic Regimes of Xenon Plasmas

Rodríguez¹,

Gil²,

Florido³

et al. 2011

Contrib. Plasma Phys.

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Xenon is a common element employed, for example, as impurity in magnetically confined plasmas or the medium in which radiative shocks propagate in laboratory astrophysics. In both situations, it is required the knowledge of plasma parameters such as the average ionization, the charge state distribution, the atomic level populations and the radiative properties. In most cases, the plasmas are under non-local thermodynamic equilibrium (NLTE) conditions and these quantities should be determined by means of the so-called collisionalradiative models. For a high Z element like xenon this is a complex task and entails a high computational cost since it is necessary to solve a very large set of rate equations. In this work are characterized the thermodynamic regimes of xenon plasmas as a function of the matter density and temperature. This fact will allow us to establish in which regions of density and temperature the assumption of local thermodynamic equilibrium (LTE) is accurate and also in which regions it can be retained to estimate some plasma parameters but not others. Moreover, it is also provided information about the average ionization in a wide range of plasma conditions which covers both LTE and NLTE regimes which is valuable information in order to optimize subsequent calculations. Finally, it is also performed an analysis of the differences of NLTE and LTE simulations on several relevant plasma parameters. With this purpose, a comparison is made between the results of the calculation using detailed NLTE modeling with simulations that use the same energy level structure, but atomic populations that are forced into LTE.

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Section: Theoretical Modelmentioning

confidence: 99%

Determination and Analysis of the Thermodynamic Regimes of Xenon Plasmas

Rodríguez¹,

Gil²,

Florido³

et al. 2011

Contrib. Plasma Phys.

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“…8 The prominent features of the Ti emission from the hot spot and the Ti absorption from the compressed shell are identified in Fig. 4(b) over a temporal window of ∼2.5 ns.…”

Section: Resultsmentioning

confidence: 96%

Streaked x-ray spectrometer having a discrete selection of Bragg geometries for Omega

Millecchia

Regan

Bahr

et al. 2012

Review of Scientific Instruments

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The streaked x-ray spectrometer (SXS) is used with streak cameras [D. H. Kalantar, P. M. Bell, R. L. Costa, B. A. Hammel, O. L. Landen, T. J. Orzechowski, J. D. Hares, and A. K. L. Dymoke-Bradshaw, in 22nd International Congress on High-Speed Photography and Photonics, edited by D. L. Paisley and A. M. Frank (SPIE, Bellingham, WA, 1997), Vol. 2869, p. 680] positioned with a ten-inch manipulator on OMEGA [T. R. Boehly et al., Opt. Commun. 133, 495 (1997)] and OMEGA EP [L. J. Waxer et al., Presented at CLEO∕QELS 2008, San Jose, CA, 4-9 May 2008 (Paper JThB1)] for time-resolved, x-ray spectroscopy of laser-produced plasmas in the 1.4- to 20-keV photon-energy range. These experiments require measuring a portion of this photon-energy range to monitor a particular emission or absorption feature of interest. The SXS relies on a pinned mechanical reference system to create a discrete set of Bragg reflection geometries for a variety of crystals. A wide selection of spectral windows is achieved accurately and efficiently using this technique. It replaces the previous spectrometer designs that had a continuous Bragg angle adjustment and required a tedious alignment calibration procedure. The number of spectral windows needed for the SXS was determined by studying the spectral ranges selected by OMEGA users over the last decade. These selections are easily configured in the SXS using one of the 25 discrete Bragg reflection geometries and one of the six types of Bragg crystals, including two curved crystals.

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“…By processing and interpreting it properly, the gated MMI data have potential to unveil various important aspects of inertial confinement fusion experiments, such as changes in the implosion core volume shape and size, space-averaged changes in temperature and density based on space-integrated spectrum, 27,28,30 and the evolution of electron temperature and density spatial structure based on the analysis of narrowband images and the space-integrated spectrum. 17 FIG.…”

Section: Discussionmentioning

confidence: 99%

Processing of spectrally resolved x-ray images of inertial confinement fusion implosion cores recorded with multimonochromatic x-ray imagers

Nagayama

Mancini

Florido

et al. 2011

Journal of Applied Physics

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We discuss the processing of data recorded with multimonochromatic x-ray imagers (MMI) in inertial confinement fusion experiments. The MMI records hundreds of gated, spectrally resolved images that can be used to unravel the spatial structure of the implosion core. In particular, we present a new method to determine the centers in all the array of images, a better reconstruction technique of narrowband implosion core images, two algorithms to determine the shape and size of the implosion core volume based on reconstructed broadband images recorded along three-quasiorthogonal lines of sight, and the removal of artifacts from the space-integrated spectra.

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Argon K-shell and bound-free emission from OMEGA direct-drive implosion cores

Cited by 23 publications

References 24 publications

Determination and Analysis of the Thermodynamic Regimes of Xenon Plasmas

Determination and Analysis of the Thermodynamic Regimes of Xenon Plasmas

Streaked x-ray spectrometer having a discrete selection of Bragg geometries for Omega

Processing of spectrally resolved x-ray images of inertial confinement fusion implosion cores recorded with multimonochromatic x-ray imagers

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