Measurements of core and compressed-shell temperature and density conditions in thick-wall target implosions at the OMEGA laser facility

Florido, R.; Mancini, Roberto; Nagayama, Taisuke; Tommasini, R.; Delettrez, J. A.; Regan, S. P.; Yaakobi, B.

doi:10.1103/physreve.83.066408

Cited by 27 publications

(22 citation statements)

References 34 publications

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“…The results have been discussed and published in [19,20]. Here, webriefiy emphasize the main results.…”

Section: An Application To Icf Plasmas: Spectroscopic Diagnosis Of Shmentioning

confidence: 96%

“…Furthermore, from N c , R, N s and R the areal density pR of the imploded target can also be obtained. Details of this procedure and comparisons with hydro-simulations and experimental data can be found in [20]. From the analysis of the space-and timeintegrated spectrum recorded in the referred shock-ignition experiments, the core and compressed shell temperature and density conditions values were extracted: T c = 930 ± 5% eV, JV C = 1.0 x 10 24 ± 20% cm" 3 , T s = 285 ± 6% and JV S = 3.8 x 10 25 ± 25% cirr 3 .…”

Section: An Application To Icf Plasmas: Spectroscopic Diagnosis Of Shmentioning

confidence: 99%

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Modelling of spectral properties and population kinetics studies of inertial fusion and laboratory-astrophysical plasmas

Mı́nguez

Florido

Rodríguez

et al. 2012

Plasma Phys. Control. Fusion

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Fundamental research and modelling in plasma atomic physics continue to be essential for providing basic understanding of many different topics relevant to high-energy-density plasmas. The Atomic Physics Group at the Institute of Nuclear Fusion has accumulated experience over the years in developing a collection of computational models and tools for determining the atomic energy structure, ionization balance and radiative properties of, mainly, inertial fusion and laser-produced plasmas in a variety of conditions. In this work, we discuss some of the latest advances and results of our research, with emphasis on inertial fusion and laboratory-astrophysical applications.

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“…The results have been discussed and published in [19,20]. Here, webriefiy emphasize the main results.…”

Section: An Application To Icf Plasmas: Spectroscopic Diagnosis Of Shmentioning

confidence: 96%

Section: An Application To Icf Plasmas: Spectroscopic Diagnosis Of Shmentioning

confidence: 99%

Modelling of spectral properties and population kinetics studies of inertial fusion and laboratory-astrophysical plasmas

Mı́nguez

Florido

Rodríguez

et al. 2012

Plasma Phys. Control. Fusion

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“…The potential application of x-ray spectroscopy to SI was motivated by modeling results, 14 and subsequently applied to the diagnosis of both core and compressed shell conditions from the analysis of the space-and time-integrated Ar tracer spectrum. 20 This article builds on this previous work and presents the analysis of time-resolved measurements. The study permits to track the onset of an attenuation effect in the compressed shell and its impact on the emergent intensity distribution of the Ar K-shell lines.…”

Section: Introductionmentioning

confidence: 98%

“…19 In parallel, the feasibility of space-and timeintegrated spectroscopy for a simultaneous diagnosis of both core and shell conditions in Ar-doped SI implosions was demonstrated, emphasizing the importance of the shell attenuation effect for a correct interpretation and analysis of the data. 20 Also, experiments using planar target for studying laser-plasma interaction and shock propagation relevant to SI were conducted at LULI-LIL, 16 LULI, 21,22 Shenguang III prototype, 23 and OMEGA. 24 Recent reviews of the concept principles and issues can be found in Refs.…”

Section: Introductionmentioning

confidence: 99%

Time-resolved characterization and energy balance analysis of implosion core in shock-ignition experiments at OMEGA

et al. 2014

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Time-resolved temperature and density conditions in the core of shock-ignition implosions have been determined for the first time. The diagnostic method relies on the observation, with a streaked crystal spectrometer, of the signature of an Ar tracer added to the deuterium gas fill. The data analysis confirms the importance of the shell attenuation effect previously noted on time-integrated spectroscopic measurements of thick-wall targets [R. Florido et al., Phys. Rev. E 83, 066408 (2011)]. This effect must be taken into account in order to obtain reliable results. The extracted temperature and density time-histories are representative of the state of the core during the implosion deceleration and burning phases. As a consequence of the ignitor shock launched by the sharp intensity spike at the end of the laser pulse, observed average core electron temperature and mass density reach T $ 1100 eV and q $ 2 g/cm 3 ; then temperature drops to T $ 920 eV while density rises to q $ 3.4 g/cm 3 about the time of peak compression. Compared to 1D hydrodynamic simulations, the experiment shows similar maximum temperatures and smaller densities. Simulations do not reproduce all observations. Differences are noted in the heating dynamics driven by the ignitor shock and the optical depth time-history of the compressed shell. Time-histories of core conditions extracted from spectroscopy show that the implosion can be interpreted as a two-stage polytropic process. Furthermore, an energy balance analysis of implosion core suggests an increase in total energy greater than what 1D hydrodynamic simulations predict. This new methodology can be implemented in other ICF experiments to look into implosion dynamics and help to understand the underlying physics. V C 2014 AIP Publishing LLC. [http://dx.

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“…By measuring the emitted hard x-rays, the number of the energetic electrons can be quantified and the preheat levels inferred [1,2] . Core hard x-ray emission of implosion targets can provide a signature of the mixing [3] , symmetry [4,5] , temperature, and density conditions of the fuel capsule [6,7] near its peak compression. X-rays of imploding targets can also be an efficient hard x-ray source for high-energy radiography of dense or high-Z targets [8,9] .…”

Section: Introductionmentioning

confidence: 99%

Hard x-ray transmission curved crystal spectrometers (10–100 keV) for laser fusion experiments at the ShenGuang-III laser facility

et al. 2016

High Pow Laser Sci Eng

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Two transmission curved crystal spectrometers are designed to measure the hard x-ray emission in the laser fusion experiment of Compton radiography of implosion target on ShenGuang-III laser facility in China. Cylindrically curved α-quartz (10-11) crystals with curvature radii of 150 and 300 mm are used to cover spectral ranges of 10-56 and 17-100 keV, respectively. The distance between the crystal and the x-ray source can be changed over a broad distance from 200 to 1500 mm. The optical design, including the integral reflectivity of the curved crystal, the sensitivity, and the spectral resolution of the spectrometers, is discussed. We also provide mechanic design details and experimental results using a Mo anode x-ray source. High-quality spectra were obtained. We confirmed that the spectral resolution can be improved by increasing the working distance, which is the distance between the recording medium and the Rowland circle.

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Measurements of core and compressed-shell temperature and density conditions in thick-wall target implosions at the OMEGA laser facility

Cited by 27 publications

References 34 publications

Modelling of spectral properties and population kinetics studies of inertial fusion and laboratory-astrophysical plasmas

Modelling of spectral properties and population kinetics studies of inertial fusion and laboratory-astrophysical plasmas

Time-resolved characterization and energy balance analysis of implosion core in shock-ignition experiments at OMEGA

Hard x-ray transmission curved crystal spectrometers (10–100 keV) for laser fusion experiments at the ShenGuang-III laser facility

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