Achieving 280 Gbar hot spot pressure in DT-layered CH capsule implosions at the National Ignition Facility

Doeppner, T; Hinkel, D E; Jarrott, L J; Masse, L; Ralph, J E; Benedetti, L R; Bachmann, B; Celliers, P; Casey, D T; Divol, L; Field, J; Goyon, C; Hatarik, R; Hohenberger, M; Izumi, N; Khan, S; Kritcher, A L; Ma, T; MacGowan, B J; Millot, M; Milovich, J; Nagel, S; Pak, A; Park, J; Patel, P; Tommasini, R; Volegov, P; Weber, C; Landen, O L; Callahan, D A; Hurricane, O A; Edwards, J

doi:10.1063/1.5135921

Achieving 280 Gbar hot spot pressure in DT-layered CH capsule implosions at the National Ignition Facility

Journal Article · Wed Apr 01 00:00:00 EDT 2020 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.5135921· OSTI ID:1635085

Doeppner, T ^[1]; Hinkel, D E ^[1]; Jarrott, L J ^[1]; Masse, L ^[1]; Ralph, J E ^[1]; Benedetti, L R ^[1]; Bachmann, B ^[1]; Celliers, P ^[1]; Casey, D T ^[1]; Divol, L ^[1]; Field, J ^[1]; Goyon, C ^[1]; Hatarik, R ^[1]; Hohenberger, M ^[1]; Izumi, N ^[1]; Khan, S ^[1]; Kritcher, A L ^[1]; Ma, T ^[1]; MacGowan, B J ^[1]; Millot, M ^[1] more »

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

We are reporting on a series of indirect-drive 0.9-scale CH capsule implosions (inner radius = 840 μm) fielded in low gas-fill (0.6 mg/cm³) hohlraums of 6.72 mm diameter at the National Ignition Facility. Thanks to the 11%-reduction of the capsule size at a given hohlraum diameter compared to previously tested full-scale capsules, we achieved good hot spot symmetry control near 33% cone-fraction and without the need to invoke cross beam energy transfer. As a result, we achieved a hot spot pressure of 280 ± 40 Gbar, which is the highest pressure demonstrated in layered DT implosions with CH capsules to date. Pushing this design to higher velocity resulted in a reduction of neutron yield. Highly resolved capsule simulations suggest that higher Au M-shell preheat resulted in an increase in Atwood number at the ablator–ice interface, which leads to increased fuel-ablator instability and mixing. The results reported here provide important scaling information for next-generation CH designs.

View Accepted Manuscript (DOE)

Research Organization:: Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: AC52-07NA27344

OSTI ID:: 1635085

Alternate ID(s):: OSTI ID: 1607945

Report Number(s):: LLNL-JRNL--789238; 985745

Journal Information:: Physics of Plasmas, Journal Name: Physics of Plasmas Journal Issue: 4 Vol. 27; ISSN 1070-664X

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

Country of Publication:: United States

Language:: English

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Achieving 280 Gbar hot spot pressure in DT-layered CH capsule implosions at the National Ignition Facility

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