1. Time-Resolved Fuel Density Profiles of the Stagnation Phase of Indirect-Drive Inertial Confinement Implosions
- Author
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Otto Landen, M. Hamamoto, T. Kohut, M. Schoff, W. W. Hsing, R. Sigurdsson, Jeremy Kroll, S. L. Ayers, R. J. Wallace, David N. Fittinghoff, Daniel H. Kalantar, S. Herriot, Gareth Hall, M. P. Mauldin, J. M. Di Nicola, Nobuhiko Izumi, Mark W. Bowers, D. K. Bradley, D. Homoelle, David Martinez, S. A. Vonhof, D. R. Hargrove, David Alessi, J. K. Okui, Riccardo Tommasini, Laurent Divol, T. Zobrist, A. Conder, Andreas Kemp, Matthew A. Prantil, K. Youngblood, John E. Heebner, Suhas Bhandarkar, Mark R. Hermann, P. Di Nicola, R. Lowe-Webb, J. Park, Jose Milovich, Janice K. Lawson, G. Gururangan, Paul J. Wegner, J. P. Holder, S. P. Hatchett, E. P. Hartouni, D. M. Holunga, K. N. LaFortune, M. J. Edwards, A. Nikroo, Mark Herrmann, C. F. Walters, N. D. Masters, Carlos A. Iglesias, L. Pelz, C. C. Widmayer, Wade H. Williams, L. F. Berzak Hopkins, Petr Volegov, and A. J. Mackinnon
- Subjects
Materials science ,Phase (waves) ,General Physics and Astronomy ,Implosion ,Hot spot (veterinary medicine) ,Mechanics ,Kinetic energy ,Residual ,01 natural sciences ,Sphericity ,Physics::Plasma Physics ,0103 physical sciences ,010306 general physics ,National Ignition Facility ,Inertial confinement fusion - Abstract
The implosion efficiency in inertial confinement fusion depends on the degree of stagnated fuel compression, density uniformity, sphericity, and minimum residual kinetic energy achieved. Compton scattering-mediated 50-200 keV x-ray radiographs of indirect-drive cryogenic implosions at the National Ignition Facility capture the dynamic evolution of the fuel as it goes through peak compression, revealing low-mode 3D nonuniformities and thicker fuel with lower peak density than simulated. By differencing two radiographs taken at different times during the same implosion, we also measure the residual kinetic energy not transferred to the hot spot and quantify its impact on the implosion performance.
- Published
- 2020