The influence of hohlraum dynamics on implosion symmetry in indirect drive inertial confinement fusion experiments

Ralph, J. E.; Landen, O.; Divol, L.; Pak, A.; Ma, T.; Callahan, D. A.; Kritcher, A. L.; Döppner, T.; Hinkel, D. E.; Jarrott, C.; Moody, J. D.; Pollock, B. B.; Hurricane, O.; Edwards, M. J.

doi:10.1063/1.5023008

Title: The influence of hohlraum dynamics on implosion symmetry in indirect drive inertial confinement fusion experiments

Journal Article · Mon Jul 30 00:00:00 EDT 2018 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.5023008· OSTI ID:1469454

Ralph, J. E. ^[1];

^[1]; Divol, L. ^[1]; Pak, A. ^[1]; Ma, T. ^[1];

^[1]; Kritcher, A. L. ^[1]; Döppner, T. ^[1]; Hinkel, D. E. ^[1];

^[1]; Moody, J. D. ^[1]; Pollock, B. B. ^[1];

^[1]; Edwards, M. J. ^[1]

Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)

High laser energy (>1.2 MJ) implosion experiments on the National Ignition Facility show that low mode implosion symmetry is highly dependent on an expanding high-Z wall “bubble” plasma feature. The bubble is caused by the early time deposition of laser beams incident on the interior near the entrance of the cylindrical hohlraum (outer cone beams). It absorbs beams designated for the waist of the hohlraum (inner cone beams) causing a redistribution of x-ray flux on the capsule. From measurements, we are able to quantify the absorption and expansion of this bubble. Measurements show that the resulting hot spot is more oblate when there is more inner beam absorption in the bubble. We also find absorption in the bubble to be between 51 ± 3% and 62 ± 2%. This bubble absorption is found to evolve predictably as a function of the early time outer cone laser pulse fluence and the pulse length. From this, a phenomenological model of the effective drive symmetry and subsequent implosion shape is found indicating a very strong dependence of implosion shape on early time laser fluence and laser pulse duration.

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

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

Grant/Contract Number:: AC52-07NA27344

OSTI ID:: 1469454

Report Number(s):: LLNL-JRNL-738440; 891669

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

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Cited by: 30 works

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References (15)

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Approaching a burning plasma on the NIF Hurricane, O. A.; Springer, P. T.; Patel, P. K. Physics of Plasmas, Vol. 26, Issue 5 https://doi.org/10.1063/1.5087256	journal	May 2019
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Maintaining low-mode symmetry control with extended pulse shapes for lower-adiabat Bigfoot implosions on the National Ignition Facility Hohenberger, M.; Casey, D. T.; Thomas, C. A. Physics of Plasmas, Vol. 26, Issue 11 https://doi.org/10.1063/1.5121435	journal	November 2019
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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Title: The influence of hohlraum dynamics on implosion symmetry in indirect drive inertial confinement fusion experiments

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