☆ 4.8 Article

2D X-Ray Radiography of Imploding Capsules at the National Ignition Facility

PHYSICAL REVIEW LETTERS (2014)

期刊

PHYSICAL REVIEW LETTERS

卷 112, 期 19, 页码 -

出版社

AMER PHYSICAL SOC

DOI: 10.1103/PhysRevLett.112.195001

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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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摘要

First measurements of the in-flight shape of imploding inertial confinement fusion (ICF) capsules at the National Ignition Facility (NIF) were obtained by using two-dimensional x-ray radiography. The sequence of area-backlit, time-gated pinhole images is analyzed for implosion velocity, low-mode shape and density asymmetries, and the absolute offset and center-of-mass velocity of the capsule shell. The in-flight shell is often observed to be asymmetric even when the concomitant core self-emission is round. A similar to 15 mu m shell asymmetry amplitude of the Y-40 spherical harmonic mode was observed for standard NIF ICF hohlraums at a shell radius of similar to 200 mu m (capsule at similar to 5x radial compression). This asymmetry is mitigated by a similar to 10% increase in the hohlraum length.

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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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