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.; Haan, S. W.; Celliers, P. M.; Clark, D. S.; Hammel, B. A.; Kozioziemski, B.; Schneider, M. B.; Marinak, M. M.; Rinderknecht, H. G.; Robey, H. F.; Salmonson, J. D.; Patel, P. K.; Ma, T.; Edwards, M. J.; Stadermann, M.; Baxamusa, S.; Alford, C.; Wang, M.; Nikroo, A.; Rice, N.; Hoover, D.; Youngblood, K. P.; Xu, H.; Huang, H.; Sio, H.

doi:10.1063/1.4948277

Title: First beryllium capsule implosions on the National Ignition Facility

Journal Article · Tue May 10 00:00:00 EDT 2016 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.4948277· OSTI ID:1408832

Kline, J. L. ^[1]; Yi, S. A. ^[1]; Simakov, A. N. ^[1]; Olson, R. E. ^[1]; Wilson, D. C. ^[1]; Kyrala, G. A. ^[1];

^[1]; Batha, S. H. ^[1];

^[1]; Dewald, E. L. ^[2]; Tommasini, R. ^[2]; Ralph, J. E. ^[2];

^[2];

^[2]; Hinkel, D. E. ^[2]; Hurricane, O. A. ^[2]; Milovich, J. L. ^[2]; Rygg, J. R. ^[2]; Khan, S. F. ^[2] more »

Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
General Atomics, San Diego, CA (United States)
Massachusetts Inst. of Technology (MIT), Cambridge, MA (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.

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Research Organization:: Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC52-06NA25396; AC52-07NA27344

OSTI ID:: 1408832

Alternate ID(s):: OSTI ID: 1252335; OSTI ID: 1366913

Report Number(s):: LA-UR-15-29483; LLNL-JRNL-702977; TRN: US1703074

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

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 33 works

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Performance of beryllium targets with full-scale capsules in low-fill 6.72-mm hohlraums on the National Ignition Facility Simakov, A. N.; Wilson, D. C.; Yi, S. A. Physics of Plasmas, Vol. 24, Issue 5 https://doi.org/10.1063/1.4983141	journal	May 2017
Using time-resolved penumbral imaging to measure low hot spot x-ray emission signals from capsule implosions at the National Ignition Facility Bishel, D. T.; Bachmann, B.; Yi, A. Review of Scientific Instruments, Vol. 89, Issue 10 https://doi.org/10.1063/1.5037073	journal	October 2018
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Probing the seeding of hydrodynamic instabilities from nonuniformities in ablator materials using 2D velocimetry Ali, S. J.; Celliers, P. M.; Haan, S. Physics of Plasmas, Vol. 25, Issue 9 https://doi.org/10.1063/1.5047943	journal	September 2018
Modeling and projecting implosion performance for the National Ignition Facility Clark, D. S.; Weber, C. R.; Kritcher, A. L. Nuclear Fusion, Vol. 59, Issue 3 https://doi.org/10.1088/1741-4326/aabcf7	journal	December 2018

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