First large capsule implosions in a frustum-shaped hohlraum

Baker, Kevin L.; Amendt, Peter A.; Ross, James Steven; Smalyuk, V. A.; Landen, Otto L.; Ho, Darwin D.; Khan, Shahab; Haan, Steven W.; Lindl, John D.; Mariscal, Derek; Milovich, Jose L.; MacLaren, Stephan; Ping, Yuan; Strozzi, David J.; Bionta, Richard M.; Casey, Daniel T.; Celliers, Peter M.; Fittinghoff, David N.; Geppert-Kleinrath, Hermann; Geppert-Kleinrath, Verena; Hahn, Kelly D.; Johnson, Maria Gatu; Kim, Yongho; Meaney, Kevin Daniel; Millot, Marius; Nora, Ryan; Volegov, Petr Lvovich; Wilde, Carl Huerstel

doi:10.1063/5.0163396

Title: First large capsule implosions in a frustum-shaped hohlraum

Journal Article · Thu Sep 28 00:00:00 EDT 2023 · Physics of Plasmas

DOI:https://doi.org/10.1063/5.0163396· OSTI ID:2222631

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Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)

Here, we report on the first indirect-drive implosions driven by a dual conical frustum-shaped hohlraum denoted “frustraum” and the experimental tuning campaigns leading up to two layered implosions. The campaign used 1.2 and 1.4 mm inner radius high density carbon (HDC) capsules and represented the largest HDC capsules to be imploded on the National Ignition Facility via indirect drive. Several techniques were successfully implemented to control the Legendre mode 2 capsule symmetry of the implosions, including changing the wall angle of the frustraum, which is not possible with cylindrical hohlraums. A mode 4 feature was observed and its implications for hotspot mix discussed. Two layered implosions were conducted with 1.2 mm inner radius capsules, the latter of which achieved the highest layered capsule absorbed energy on the National Ignition Facility using only 1.74 MJ of laser energy. The layered implosion results, along with generalized Lawson parameters, suggest that increasing the energy absorbed by the capsule at the expense of long coast times makes it more challenging to achieve ignition and that further reducing coast time (time between end of laser pulse and bang time) closer to the 1 ns level is warranted to improve the areal density and make it easier to achieve the hotspot temperature, alpha heating, and yield amplification required for ignition.

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

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA); General Atomics (GA)

Grant/Contract Number:: 89233218CNA000001; AC52-07NA27344; NA0001808

OSTI ID:: 2222631

Alternate ID(s):: OSTI ID: 2280489

Report Number(s):: LA-UR-23-30554; LLNL-JRNL-850432

Journal Information:: Physics of Plasmas, Vol. 30, Issue 9; ISSN 1070-664X

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

Country of Publication:: United States

Language:: English

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Title: First large capsule implosions in a frustum-shaped hohlraum

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