Implosion shape control of high-velocity, large case-to-capsule ratio beryllium ablators at the National Ignition Facility

Loomis, E. N.; Yi, Sunghwan A.; Kyrala, George Amine; Kline, John L.; Simakov, Andrei N.; Ralph, Joseph; Millot, Marius; Dewald, Edouard; Zylstra, Alex; Rygg, J. R.; Celliers, P.; Goyon, C.; Lahmann, B.; Sio, H.; MacLaren, Stephen; Masse, Laurent; Callahan, Debra; Hurricane, Omar; Wilson, Douglas Carl; Rice, Neal; Huang, Haibo; Kong, C.; Bae, J.; Nikroo, Abbas; Batha, Steven H.

doi:10.1063/1.5040995

Title: Implosion shape control of high-velocity, large case-to-capsule ratio beryllium ablators at the National Ignition Facility

Journal Article · Sun Jul 01 00:00:00 EDT 2018 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.5040995· OSTI ID:1463550

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

Experiments at the National Ignition Facility (NIF) show that the implosion shape of inertial confinement fusion ablators is a key factor limiting performance. To achieve more predictable, shape tunable implosions, we have designed and fielded a large 4.2 case-to-capsule ratio target at the NIF using 6.72 mm diameter Au hohlraums and 1.6 mm diameter Cu-doped Be capsules. Simulations show that at these dimensions during a 10 ns 3-shock laser pulse reaching 275 eV hohlraum temperatures, the plasma flow from the hohlraum wall and ablator is not significant enough to impede beam propagation. Experiments measuring the shock symmetry and in-flight shell symmetry closely matched the simulations. Most notably, in two experiments, we demonstrated symmetry control from negative to positive Legendre P2 space by varying the inner to total laser power cone fraction by 5% below and above the predicted symmetric value. In conclusion, some discrepancies found in 1st shock arrival times that could affect agreement in late time implosion symmetry suggest hohlraum and capsule modeling uncertainties do remain, but this target design reduces sensitivities to them.

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Research Organization:: Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC52-06NA25396

OSTI ID:: 1463550

Alternate ID(s):: OSTI ID: 1461928

Report Number(s):: LA-UR-17-29075; TRN: US1902315

Journal Information:: Physics of Plasmas, Vol. 25, Issue 7; ISSN 1070-664X

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

Country of Publication:: United States

Language:: English

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Cited by: 13 works

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Cited By (5)

Beryllium capsule implosions at a case-to-capsule ratio of 3.7 on the National Ignition Facility Zylstra, A. B.; Yi, S. A.; MacLaren, S. Physics of Plasmas, Vol. 25, Issue 10 https://doi.org/10.1063/1.5041285	journal	October 2018
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Progress of indirect drive inertial confinement fusion in the United States Kline, J. L.; Batha, S. H.; Benedetti, L. R. Nuclear Fusion, Vol. 59, Issue 11 https://doi.org/10.1088/1741-4326/ab1ecf	journal	July 2019

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