☆ 4.8 Article

Demonstration of Ignition Radiation Temperatures in Indirect-Drive Inertial Confinement Fusion Hohlraums

PHYSICAL REVIEW LETTERS (2011)

期刊

PHYSICAL REVIEW LETTERS

卷 106, 期 8, 页码 -

出版社

AMER PHYSICAL SOC

DOI: 10.1103/PhysRevLett.106.085004

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Physics, Multidisciplinary

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U.S. Department of Energy by Lawrence Livermore National Laboratory [DE-AC52-07NA27344]

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We demonstrate the hohlraum radiation temperature and symmetry required for ignition-scale inertial confinement fusion capsule implosions. Cryogenic gas-filled hohlraums with 2.2 mm-diameter capsules are heated with unprecedented laser energies of 1.2 MJ delivered by 192 ultraviolet laser beams on the National Ignition Facility. Laser backscatter measurements show that these hohlraums absorb 87% to 91% of the incident laser power resulting in peak radiation temperatures of T(RAD) = 300 eV and a symmetric implosion to a 100 mu m diameter hot core.

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Article Physics, Fluids & Plasmas

Reduced mixing in inertial confinement fusion with early-time interface acceleration

C. R. Weber, D. S. Clark, D. T. Casey, G. N. Hall, O. Jones, O. Landen, A. Pak, V. A. Smalyuk

Summary: In inertial confinement fusion (ICF) implosions, the interface between the cryogenic DT fuel and the ablator is unstable to shock acceleration and constant acceleration. The Rayleigh-Taylor instability (RT) can produce oscillatory motion that stabilizes against the Richtmyer-Meshkov instability (RM) if the constant acceleration is in the direction of lighter material. This characteristic is now being incorporated into newer designs to improve compression while minimizing ablator mixing into the fuel.

PHYSICAL REVIEW E (2023)

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Article Physics, Multidisciplinary

Indirect evidence for elemental hydrogen in laser-compressed hydrocarbons

D. Kraus, J. Vorberger, N. J. Hartley, J. Luetgert, M. Roedel, D. Chekrygina, T. Doppner, T. van Driel, R. W. Falcone, L. B. Fletcher, S. Frydrych, E. Galtier, D. O. Gericke, S. H. Glenzer, E. Granados, Y. Inubushi, N. Kamimura, K. Katagiri, M. J. MacDonald, A. J. MacKinnon, T. Matsuoka, K. Miyanishi, E. E. McBride, I. Nam, P. Neumayer, N. Ozaki, A. Pak, A. Ravasio, A. M. Saunders, A. K. Schuster, M. G. Stevenson, K. Sueda, P. Sun, T. Togashi, K. Voigt, M. Yabashi, T. Yabuuchi

Summary: We demonstrate a simplified experimental approach to investigate liquid metallic hydrogen, providing indirect evidence for its creation in shock-compressed plastics. This approach not only helps understand the internal structure and evolution of giant planets, but also offers a new benchmark for theoretical studies under extreme pressures and temperatures. Furthermore, it may lead to opportunities in probing the chemical behavior of metallic hydrogen in mixture with other elements and synthesizing new materials.

PHYSICAL REVIEW RESEARCH (2023)

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Article Physics, Fluids & Plasmas

Alpha heating of indirect-drive layered implosions on the National Ignition Facility

K. L. Baker, S. MacLaren, O. Jones, B. K. Spears, P. K. Patel, R. Nora, L. Divol, O. L. Landen, G. J. Anderson, J. Gaffney, M. Kruse, O. A. Hurricane, D. A. Callahan, A. R. Christopherson, J. Salmonson, E. P. Hartouni, T. Doppner, E. Dewald, R. Tommasini, C. A. Thomas, C. Weber, D. Clark, D. T. Casey, M. Hohenberger, S. Khan, T. Woods, J. L. Milovich, R. L. Berger, D. Strozzi, A. Kritcher, B. Bachmann, R. Benedetti, R. Bionta, P. M. Celliers, D. Fittinghoff, R. Hatarik, N. Izumi, M. Gatu Johnson, G. Kyrala, T. Ma, K. Meaney, M. Millot, S. R. Nagel, A. Pak, P. L. Volegov, C. Yeamans, C. Wilde

Summary: In order to understand the proximity to ignition of current layered implosions in indirect-drive inertial confinement fusion, the level of alpha heating present needs to be measured. Experimental validation of current simulation-based methods of determining yield amplification was conducted through paired experiments, consisting of low-yield tritium-hydrogen-deuterium (THD) layered implosion and high-yield deuterium-tritium (DT) layered implosion. The THD capsules were designed to reduce DT neutron yield (alpha heating) while maintaining hydrodynamic similarity with the higher yield DT capsules. The measured yield ratio in these experiments allowed the determination of the alpha heating level in the DT layered implosions.

PHYSICAL REVIEW E (2023)

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Article Physics, Fluids & Plasmas

Measurements of improved stability to achieve higher fuel compression in ICF

A. Do, D. T. Casey, D. S. Clark, B. Bachmann, K. L. Baker, T. Braun, T. M. Briggs, T. D. Chapman, P. M. Celliers, H. Chen, C. Choate, E. L. Dewald, L. Divol, G. Fathi, D. N. Fittinghoff, G. N. Hall, E. Hartouni, D. M. Holunga, S. F. Khan, A. L. Kritcher, O. L. Landen, A. G. Macphee, M. Millot, E. V. Marley, J. L. Milovich, A. Nikroo, A. E. Pak, D. J. Schlossberg, V. A. Smalyuk, M. Stadermann, D. J. Strozzi, R. Tommasini, C. R. Weber, B. N. Woodworth, D. K. Yanagisawa, N. W. Birge, C. R. Danly, M. Durocher, M. S. Freeman, H. Geppert-Kleinrath, V. Geppert-Kleinrath, Y. Kim, K. D. Meaney, C. H. Wilde, M. Gatu Johnson, A. Allen, M. Ratledge, C. Kong, T. Fehrenbach, C. Wild

Summary: This article examines the improvement of compression in high-density carbon-based ablators by reducing hydrodynamic growth of perturbations. Through experiments with different pulse shapes and ablators distribution, the study evaluates implosion symmetry, laser backscatter, stability, and compression. The research demonstrates improved compression has been achieved.

PHYSICS OF PLASMAS (2023)

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