Progress in the development of the MARBLE platform for studying thermonuclear burn in the presence of heterogeneous mix on OMEGA and the National Ignition Facility

Journal Article · Thu May 26 00:00:00 EDT 2016 · Journal of Physics. Conference Series

DOI:https://doi.org/10.1088/1742-6596/717/1/012072· OSTI ID:1258485

Murphy, T. J. ^[1]; Douglas, M. R. ^[1]; Fincke, J. R. ^[1]; Olson, R. E. ^[1]; Cobble, J. A. ^[1]; Haines, B. M. ^[1]; Hamilton, C. E. ^[1]; Lee, M. N. ^[1]; Oertel, J. A. ^[1]; Parra-Vasquez, N. A. G. ^[1]; Randolph, R. B. ^[1]; Schmidt, D. W. ^[1]; Shah, R. C. ^[1]; Smidt, J. M. ^[1]; Tregillis, I. L. ^[1]

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1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

Mix of ablator material into fuel of an ICF capsule adds non-burning material, diluting the fuel and reducing burn. The amount of the reduction is dependent in part on the morphology of the mix. A probability distribution function (PDF) burn model has been developed [6] that utilizes the average concentration of mixed materials as well as the variance in this quantity across cells provided by the BHR turbulent transport model [3] and its revisions [4] to describe the mix in terms of a PDF of concentrations of fuel and ablator material, and provides the burn rate in mixed material. Work is underway to develop the MARBLE ICF platform for use on the National Ignition Facility in experiments to quantify the influence of heterogeneous mix on fusion burn. This platform consists of a plastic (CH) capsule filled with a deuterated plastic foam (CD) with a density of a few tens of milligrams per cubic centimeter, with tritium gas filling the voids in the foam. This capsule will be driven using x-ray drive on NIF, and the resulting shocks will induce turbulent mix that will result in the mixing of deuterium from the foam with the tritium gas. In order to affect the morphology of the mix, engineered foams with voids of diameter up to 100 microns will be utilized. The degree of mix will be determined from the ratio of DT to DD neutron yield. As the mix increases, the yield from reactions between the deuterium of the CD foam with tritium from the gas will increase. Lastly, the ratio of DT to DD neutrons will be compared to a variation of the PDF burn model that quantifies reactions from initially separated reactants.

• Research Organization: Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
• Sponsoring Organization: USDOE
• Grant/Contract Number: AC52-06NA25396
• OSTI ID: 1258485
• Report Number(s): LA-UR-16-20597
• Journal Information: Journal of Physics. Conference Series, Vol. 717; Conference: International Fusion Sciences & Applications, Seattle, WA (United States), 20-25 Sep 2015; ISSN 1742-6588
• Publisher: IOP Publishing
• Country of Publication: United States
• Language: English

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70 PLASMA PHYSICS AND FUSION TECHNOLOGY