☆ 4.4 Article

First results of radiation-driven, layered deuterium-tritium implosions with a 3-shock adiabat-shaped drive at the National Ignition Facility

PHYSICS OF PLASMAS (2015)

期刊

PHYSICS OF PLASMAS

卷 22, 期 8, 页码 -

出版社

AIP Publishing

DOI: 10.1063/1.4929912

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Physics, Fluids & Plasmas

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

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摘要

Radiation-driven, layered deuterium-tritium plastic capsule implosions were carried out using a new, 3-shock adiabat-shaped drive on the National Ignition Facility. The purpose of adiabat shaping is to use a stronger first shock, reducing hydrodynamic instability growth in the ablator. The shock can decay before reaching the deuterium-tritium fuel leaving it on a low adiabat and allowing higher fuel compression. The fuel areal density was improved by similar to 25% with this new drive compared to similar high-foot implosions, while neutron yield was improved by more than 4 times, compared to low-foot implosions driven at the same compression and implosion velocity. (C) 2015 AIP Publishing LLC.

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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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