Development of new platforms for hydrodynamic instability and asymmetry measurements in deceleration phase of indirectly driven implosions on NIF

Pickworth, L. A.; Hammel, B. A.; Smalyuk, V. A.; Robey, H. F.; Tommasini, R.; Benedetti, L. R.; Berzak Hopkins, L.; Bradley, D. K.; Dayton, M.; Felker, S.; Field, J. E.; Haan, S. W.; Haid, B.; Hatarik, R.; Hartouni, E.; Holunga, D.; Hoppe, M.; Izumi, N.; Johnson, S.; Khan, S.; Kohut, T.; Lahmann, B.; Landen, O. L.; LePape, S.; MacPhee, A. G.; Marley, E.; Meezan, N. B.; Milovich, J.; Nagel, S. R.; Nikroo, A.; Pak, A. E.; Petrasso, R.; Remington, B. A.; Rice, N. G.; Scott, H. A.; Springer, P. T.; Stadermann, M.; Walters, C.; Widmann, K.; Hsing, W. W.

doi:10.1063/1.5039744

Title: Development of new platforms for hydrodynamic instability and asymmetry measurements in deceleration phase of indirectly driven implosions on NIF

Journal Article · Tue Aug 14 00:00:00 EDT 2018 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.5039744· OSTI ID:1512596

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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)
Lawrence Livermore National Laboratory, Livermore, California 94550, USA

Hydrodynamic instabilities and asymmetries are a major obstacle in the quest to achieve ignition at the National Ignition Facility (NIF) as they cause pre-existing capsule perturbations to grow and ultimately quench the fusion burn in experiments. This paper reviews the development of two new experimental techniques to measure high-mode instabilities and low-mode asymmetries in the deceleration phase of indirect drive inertial confinement fusion implosions. In the first innovative technique, self-emission from the hot spot was enhanced with an argon dopant to “self-backlight” the shell in-flight, imaging the perturbations in the shell near peak velocity. Experiments with pre-imposed two-dimensional perturbations showed hydrodynamic instability growth of up to 7000× in areal density. These experiments discovered unexpected three-dimensional structures originating from the capsule support structures. These new 3-D structures became one of the primary concerns for the indirect drive ICF program that requires their origin to be understood and their impact mitigated. In a second complementary technique, the inner surface of the decelerating shell was visualized in implosions using x-ray emission of a high-Z dopant added to the inner surface of the capsule. With this technique, low mode asymmetry and high mode perturbations, including perturbations seeded by the gas fill tube and capsule support structure, were quantified near peak compression. Using this doping method, the role of perturbations and radiative losses from high atomic number materials on neutron yield was quantified.

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

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

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

OSTI ID:: 1512596

Alternate ID(s):: OSTI ID: 1464586

Report Number(s):: LLNL-JRNL-750655; 935989

Journal Information:: Physics of Plasmas, Vol. 25, Issue 8; ISSN 1070-664X

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

Country of Publication:: United States

Language:: English

Citation Metrics:

Cited by: 18 works

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