Dynamic hohlraum experiments on SATURN

Nash, T. J.; Derzon, M. S.; Allshouse, G.O.; Deeney, C.; Seaman, J. F.; McGurn, J.; Jobe, D.; Gilliland, T. L.; Macfarlane, J. J.; Wang, P.; Petersen, Daria

doi:10.1063/1.53818

Cited by 12 publications

(5 citation statements)

References 4 publications

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“…For instance, this ratio is about 0.78 on the Z experiments, 11,13 and about 0.69 on the Saturn experiments. 15 This kind of loads can provide a more efficient energy conversion from the wire-array plasma to the converter in order to generate a higher radiation temperature hohlraum. It is found that the collision of the wire-array plasma with the converter just takes place several to 10 ns earlier than the final stagnation in these cases.…”

Section: Introductionmentioning

confidence: 99%

“…Several other machines, such as the Angara-5-1 and Saturn facilities, also conducted dynamic hohlraum or double liner experiments. 2,14,15 Based on the results on these three generators, Nash presented an approximate scaling of dynamic hohlraum radiation temperature as T ¼ 56I 0:46 eV, 9 where I is the peak drive current in MA. A straightforward extrapolation to a machine of about 60 MA was then suggested to explore the physics of high yield fusions using dynamic hohlraums.…”

Section: Introductionmentioning

confidence: 99%

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Numerical and experimental investigations on the interaction of light wire-array Z-pinches with embedded heavy foam converters

Xiao

Ding

et al. 2014

Physics of Plasmas

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The interaction of a light tungsten wire-array Z-pinch with an embedded heavy foam converter, whose mass ratio is typically less than 0.16, is numerically analyzed and experimentally investigated on the 1.3 MA "QiangGuang I" facility. Computational results show that this implosion process can be divided into three stages: acceleration of the tungsten wire-array plasma, collision, and stagnation. The tungsten plasma is accelerated to a high speed by the J Â B force and interacts weakly with the foam plasma in the first stage. Strong energy conversions take place in the second collision stage. When the high speed tungsten plasma impacts on the foam converter, the plasma is thermalized and a radial radiation peak is produced. Meanwhile, a shock wave is generated due to the collision. After the shock rebounds from the axis and meets the W/Foam boundary, the plasma stagnates and the second radial radiation peak appears. The collision and stagnation processes were observed and the two-peak radial radiation pulse was produced in experiments. Increasing the wire-array radius from 4 mm to 6 mm, the kinetic energy of the tungsten plasma is increased, causing a stronger thermalization and generating a higher first radiation peak. Experimental results also showed a higher ratio of the first peak to the second peak in the case of larger wire-array radius. If we add a thin CH film cover onto the surface of the embedded foam converter, the first radiation peak will be hardly changed, because the acceleration of the tungsten plasma is not evidently affected by the film cover. However, the second radiation peak decreases remarkably due to the large load mass and the corresponding weak compression. V C 2014 AIP Publishing LLC. [http://dx.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Numerical and experimental investigations on the interaction of light wire-array Z-pinches with embedded heavy foam converters

Xiao

Ding

et al. 2014

Physics of Plasmas

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“…1,2 In these experiments, SATURN drives lowdensity Si aerogel ͑SiO 2 ͒ and agar ͑C 7 H 13 NO 5 ͒ foam loads with currents of about 7 MA with a rise time of approximately 50 ns. The purpose of the experiments is to study the initiation, acceleration, and stagnation phases of the pinch.…”

Section: Introductionmentioning

confidence: 99%

Analysis of x-ray spectra obtained in foam Z-pinch experiments

Macfarlane

Wang

Nash

et al. 1997

Review of Scientific Instruments

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Time and space resolved measurements of visible-light and soft x-ray emission from foam z-pinch plasmas and implosions Rev.Foam Z-pinch experiments have recently been performed on SATURN to study issues associated with the initiation, acceleration, and stagnation phases of the pinch. Time-integrated x-ray crystal spectra have been recorded from experiments with 5 mg/cc Si aerogel loads and 10 mg/cc agar loads. In this article, we describe results from collisional-radiative equilibrium calculations performed to analyze the Si, Na, and S K-shell emission observed in the spectra. Particular attention is paid to density and opacity effects on intensity ratios involving He ␣ , He intercombination, and Li-like satellite lines.

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“…The radiation temperatures required for ignition of an indirect-drive DT capsule are in the range of 250 eV for designs similar to ICF capsules driven by lasers (Lindl, 1995) The temperatures presently reached in the Z-pinch experiments are in the range of 130-160 eV (e.g., Nash et al, 1997b). These ICF ignition and high yield capsules also require precise pulse shaping and a high degree of radiation symmetry.…”

Section: B2mentioning

confidence: 99%