High-density carbon ablator experiments on the National Ignition Facility

MacKinnon, A. J.; Meezan, N. B.; Ross, J. S.; Le Pape, S.; Berzak Hopkins, L.; Divol, L.; Ho, D.; Milovich, J.; Pak, A.; Ralph, J.; Döppner, T.; Patel, P. K.; Thomas, C.; Tommasini, R.; Haan, S.; MacPhee, A. G.; McNaney, J.; Caggiano, J.; Hatarik, R.; Bionta, R.; Ma, T.; Spears, B.; Rygg, J. R.; Benedetti, L. R.; Town, R. J.; Bradley, D. K.; Dewald, E. L.; Fittinghoff, D.; Jones, O. S.; Robey, H. R.; Moody, J. D.; Khan, S.; Callahan, D. A.; Hamza, A.; Biener, J.; Celliers, P. M.; Braun, D. G.; Erskine, D. J.; Prisbrey, S. T.; Wallace, R. J.; Kozioziemski, B.; Dylla-Spears, R.; Sater, J.; Collins, G.; Storm, E.; Hsing, W.; Landen, O.; Atherton, J. L.; Lindl, J. D.; Edwards, M. J.; Frenje, J. A.; Gatu-Johnson, M.; Li, C. K.; Petrasso, R.; Rinderknecht, H.; Rosenberg, M.; Séguin, F. H.; Zylstra, A.; Knauer, J. P.; Grim, G.; Guler, N.; Merrill, F.; Olson, R.; Kyrala, G. A.; Kilkenny, J. D.; Nikroo, A.; Moreno, K.; Hoover, D. E.; Wild, C.; Werner, E.

doi:10.1063/1.4876611

High-density carbon ablator experiments on the National Ignition Facility

Journal Article · Wed May 28 00:00:00 EDT 2014 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.4876611· OSTI ID:1133443

MacKinnon, A. J. ^[1]; Meezan, N. B. ^[2]; Ross, J. S. ^[2]; Le Pape, S. ^[2]; Berzak Hopkins, L. ^[2]; Divol, L. ^[2]; Ho, D. ^[2]; Milovich, J. ^[2]; Pak, A. ^[2]; Ralph, J. ^[2]; Döppner, T. ^[2]; Patel, P. K. ^[2]; Thomas, C. ^[2]; Tommasini, R. ^[2]; Haan, S. ^[2]; MacPhee, A. G. ^[2]; McNaney, J. ^[2]; Caggiano, J. ^[2]; Hatarik, R. ^[2]; Bionta, R. ^[2] more »

Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States); High Energy Density Physics Division, Plasma Science and Fusion Center, Massachusetts Institute of Technology
Lawrence Livermore National Laboratory 1 , P.O. Box 808, Livermore, California 94551-0808, USA
Plasma Science and Fusion Center, Massachusetts Institute of Technology 2 , Cambridge, Massachusetts 02139, USA
Laboratory for Laser Energetics, University of Rochester 3 , Rochester, New York 14623, USA
Los Alamos National Laboratory 4 , Los Alamos, New Mexico 87545, USA
General Atomics 5 , P.O. Box 85608, San Diego, California 93286-5608, USA
Diamond Materials GmbH 6 , Hans-Bunte-Str. 19, 79108 Freiburg, Germany

High Density Carbon (HDC) is a leading candidate as an ablator material for Inertial Confinement Fusion (ICF) capsules in x-ray (indirect) drive implosions. HDC has a higher density (3.5 g/cc) than plastic (CH, 1 g/cc), which results in a thinner ablator with a larger inner radius for a given capsule scale. This leads to higher x-ray absorption and shorter laser pulses compared to equivalent CH designs. This paper will describe a series of experiments carried out to examine the feasibility of using HDC as an ablator using both gas filled hohlraums and lower density, near vacuum hohlraums. These experiments have shown that deuterium (DD) and deuterium-tritium gas filled HDC capsules driven by a hohlraum filled with 1.2 mg/cc He gas, produce neutron yields a factor of 2× higher than equivalent CH implosions, representing better than 50% Yield-over-Clean (YoC). In a near vacuum hohlraum (He = 0.03 mg/cc) with 98% laser-to-hohlraum coupling, such a DD gas-filled capsule performed near 1D expectations. A cryogenic layered implosion version was consistent with a fuel velocity = 410 ± 20 km/s with no observed ablator mixing into the hot spot.

Research Organization:: Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States). Plasma Science and Fusion Center; Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA)

DOE Contract Number:: NA0001857; AC52-07NA27344

OSTI ID:: 1133443

Journal Information:: Physics of Plasmas, Journal Name: Physics of Plasmas Journal Issue: 5 Vol. 21; ISSN 1070-664X

Publisher:: American Institute of Physics (AIP)

Country of Publication:: United States

Language:: English

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