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

Abstract

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.

Authors:

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)

Publication Date:: 2018-07-30

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

Sponsoring Org.:: USDOE National Nuclear Security Administration (NNSA)

OSTI Identifier:: 1469454

Report Number(s):: LLNL-JRNL-738440
Journal ID: ISSN 1070-664X; 891669

Grant/Contract Number:: AC52-07NA27344

Resource Type:: Accepted Manuscript

Journal Name:: Physics of Plasmas

Additional Journal Information:: Journal Volume: 25; Journal Issue: 8; Journal ID: ISSN 1070-664X

Publisher:: American Institute of Physics (AIP)

Country of Publication:: United States

Language:: English

Subject:: 70 PLASMA PHYSICS AND FUSION TECHNOLOGY; electron density; plasmas; x-rays; tectonophysics; speed of sound; transition metals; chemical elements; hydrodynamics simulations; radiograph; nuclear fusion

Citation Formats


                    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., and Edwards, M. J. The influence of hohlraum dynamics on implosion symmetry in indirect drive inertial confinement fusion experiments.  United States: N. p., 2018. 
        Web.  doi:10.1063/1.5023008.

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                    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. The influence of hohlraum dynamics on implosion symmetry in indirect drive inertial confinement fusion experiments.  United States.  doi:https://doi.org/10.1063/1.5023008

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                    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., and Edwards, M. J. Mon .  
        "The influence of hohlraum dynamics on implosion symmetry in indirect drive inertial confinement fusion experiments".  United States.  doi:https://doi.org/10.1063/1.5023008.  https://www.osti.gov/servlets/purl/1469454.

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@article{osti_1469454,

  title        = {The influence of hohlraum dynamics on implosion symmetry in indirect drive inertial confinement fusion experiments},

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

  abstractNote = {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.},

  doi          = {10.1063/1.5023008},

  journal      = {Physics of Plasmas},

  number       = 8,

  volume       = 25,

  place        = {United States},

  year         = {2018},

  month        = {7}

}

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DOI: https://doi.org/10.1063/1.5023008

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Works referenced in this record:

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journal, September 2018

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

Abstract

Citation Formats

Development of Improved Radiation Drive Environment for High Foot Implosions at the National Ignition Facility journal, November 2016

2D X-Ray Radiography of Imploding Capsules at the National Ignition Facility journal, May 2014

Images of the laser entrance hole from the static x-ray imager at NIF journal, October 2010

Demonstration of High Performance in Layered Deuterium-Tritium Capsule Implosions in Uranium Hohlraums at the National Ignition Facility journal, July 2015

The physics basis for ignition using indirect-drive targets on the National Ignition Facility journal, February 2004

Experimental room temperature hohlraum performance study on the National Ignition Facility journal, December 2016

The National Ignition Facility: Ushering in a new age for high energy density science journal, April 2009

VISRAD—A 3-D view factor code and design tool for high-energy density physics experiments journal, September 2003

High-Adiabat High-Foot Inertial Confinement Fusion Implosion Experiments on the National Ignition Facility journal, February 2014

Design of a High-Foot High-Adiabat ICF Capsule for the National Ignition Facility journal, February 2014

The Physics of Inertial Fusion book, January 2004

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Laser Compression of Matter to Super-High Densities: Thermonuclear (CTR) Applications journal, September 1972

Precision Shock Tuning on the National Ignition Facility journal, May 2012

Three-dimensional HYDRA simulations of National Ignition Facility targets journal, May 2001

Approaching a burning plasma on the NIF journal, May 2019

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Energy transfer between lasers in low-gas-fill-density hohlraums journal, November 2018

High-Performance Indirect-Drive Cryogenic Implosions at High Adiabat on the National Ignition Facility journal, September 2018

Development of Improved Radiation Drive Environment for High Foot Implosions at the National Ignition Facility
journal, November 2016

2D X-Ray Radiography of Imploding Capsules at the National Ignition Facility
journal, May 2014

Images of the laser entrance hole from the static x-ray imager at NIF
journal, October 2010

Demonstration of High Performance in Layered Deuterium-Tritium Capsule Implosions in Uranium Hohlraums at the National Ignition Facility
journal, July 2015

The physics basis for ignition using indirect-drive targets on the National Ignition Facility
journal, February 2004

Experimental room temperature hohlraum performance study on the National Ignition Facility
journal, December 2016

The National Ignition Facility: Ushering in a new age for high energy density science
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VISRAD—A 3-D view factor code and design tool for high-energy density physics experiments
journal, September 2003

High-Adiabat High-Foot Inertial Confinement Fusion Implosion Experiments on the National Ignition Facility
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Design of a High-Foot High-Adiabat ICF Capsule for the National Ignition Facility
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Thin Shell, High Velocity Inertial Confinement Fusion Implosions on the National Ignition Facility
journal, April 2015

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Precision Shock Tuning on the National Ignition Facility
journal, May 2012

Three-dimensional HYDRA simulations of National Ignition Facility targets
journal, May 2001

Approaching a burning plasma on the NIF
journal, May 2019

Ultra-high (>30%) coupling efficiency designs for demonstrating central hot-spot ignition on the National Ignition Facility using a Frustraum
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Maintaining low-mode symmetry control with extended pulse shapes for lower-adiabat Bigfoot implosions on the National Ignition Facility
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