First beryllium capsule implosions on the National Ignition Facility

Kline, J. L.; Yi, S. A.; Simakov, A. N.; Olson, R. E.; Wilson, D. C.; Kyrala, G. A.; Perry, T. S.; Batha, S. H.; Zylstra, A. B.; Dewald, E. L.; Tommasini, R.; Ralph, J. E.; Strozzi, D. J.; MacPhee, A. G.; Callahan, D. A.; Hinkel, D. E.; Hurricane, O. A.; Milovich, J. L.; Rygg, J. R.; Khan, S. F.; others, and

doi:10.1063/1.4948277

First beryllium capsule implosions on the National Ignition Facility

Journal Article · Sun May 15 04:00:00 EDT 2016 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.4948277· OSTI ID:22600249

Kline, J. L.; Yi, S. A.; Simakov, A. N.; Olson, R. E.; Wilson, D. C.; Kyrala, G. A.; Perry, T. S.; Batha, S. H.; Zylstra, A. B. ^[1]; Dewald, E. L.; Tommasini, R.; Ralph, J. E.; Strozzi, D. J.; MacPhee, A. G.; Callahan, D. A.; Hinkel, D. E.; Hurricane, O. A.; Milovich, J. L.; Rygg, J. R.; Khan, S. F. ^[2] more »

Los Alamos National Laboratory, Los Alamos, New Mexico 87544 (United States)
Lawrence Livermore National Laboratory, Livermore, California 94550 (United States)

The first indirect drive implosion experiments using Beryllium (Be) capsules at the National Ignition Facility confirm the superior ablation properties and elucidate possible Be-ablator issues such as hohlraum filling by ablator material. Since the 1990s, Be has been the preferred Inertial Confinement Fusion (ICF) ablator because of its higher mass ablation rate compared to that of carbon-based ablators. This enables ICF target designs with higher implosion velocities at lower radiation temperatures and improved hydrodynamic stability through greater ablative stabilization. Recent experiments to demonstrate the viability of Be ablator target designs measured the backscattered laser energy, capsule implosion velocity, core implosion shape from self-emission, and in-flight capsule shape from backlit imaging. The laser backscatter is similar to that from comparable plastic (CH) targets under the same hohlraum conditions. Implosion velocity measurements from backlit streaked radiography show that laser energy coupling to the hohlraum wall is comparable to plastic ablators. The measured implosion shape indicates no significant reduction of laser energy from the inner laser cone beams reaching the hohlraum wall as compared with plastic and high-density carbon ablators. These results indicate that the high mass ablation rate for beryllium capsules does not significantly alter hohlraum energetics. In addition, these data, together with data for low fill-density hohlraum performance, indicate that laser power multipliers, required to reconcile simulations with experimental observations, are likely due to our limited understanding of the hohlraum rather than the capsule physics since similar multipliers are needed for both Be and CH capsules as seen in experiments.

OSTI ID:: 22600249

Journal Information:: Physics of Plasmas, Journal Name: Physics of Plasmas Journal Issue: 5 Vol. 23; ISSN PHPAEN; ISSN 1070-664X

Country of Publication:: United States

Language:: English

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Implosion shape control of high-velocity, large case-to-capsule ratio beryllium ablators at the National Ignition Facility Loomis, E. N.; Yi, S. A.; Kyrala, G. A. Physics of Plasmas, Vol. 25, Issue 7 https://doi.org/10.1063/1.5040995	journal	July 2018
Octahedral spherical Hohlraum for Rev. 6 NIF beryllium capsule Ren, Guoli; Lan, Ke; Chen, Yao-Hua Physics of Plasmas, Vol. 25, Issue 10 https://doi.org/10.1063/1.5041026	journal	October 2018
Announcement: The 2018 Ronald C. Davidson Award for Plasma Physics Mauel, Michael E. Physics of Plasmas, Vol. 26, Issue 5 https://doi.org/10.1063/1.5109579	journal	May 2019
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The potential of imposed magnetic fields for enhancing ignition probability and fusion energy yield in indirect-drive inertial confinement fusion Perkins, L. J.; Ho, D. D. -M; Logan, B. G. Physics of Plasmas, Vol. 24, Issue 6 https://doi.org/10.1063/1.4985150	journal	June 2017
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Diffusion-dominated mixing in moderate convergence implosions Zylstra, A. B.; Hoffman, N. M.; Herrmann, H. W. Physical Review E, Vol. 97, Issue 6 https://doi.org/10.1103/PhysRevE.97.061201	journal	June 2018

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70 PLASMA PHYSICS AND FUSION TECHNOLOGY
ABLATION
BERYLLIUM
CAPSULES
CARBON
COMPARATIVE EVALUATIONS
DENSITY
ELECTRON BEAM TARGETS
IMPLOSIONS
INERTIAL CONFINEMENT
ION BEAM TARGETS
LASER TARGETS
LASERS
PLASTICS
SHAPE
SIMULATION
THERMONUCLEAR IGNITION
US NATIONAL IGNITION FACILITY
VELOCITY

First beryllium capsule implosions on the National Ignition Facility

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