View factor estimation of hot spot velocities in inertial confinement fusion implosions at the National Ignition Facility

Young, C. V.; Masse, L.; Casey, D. T.; MacGowan, B. J.; Landen, O. L.; Callahan, D. A.; Meezan, N. B.; Nora, R.; Patel, P. K.

doi:10.1063/5.0009746

Title: View factor estimation of hot spot velocities in inertial confinement fusion implosions at the National Ignition Facility

Abstract

nertial confinement fusion (ICF) experiments at the National Ignition Facility (NIF) suffer from asymmetries in thex-ray drive that degrade capsule performance compared to expectations for a symmetric one-dimensional implosion.Mode 1, or pole-to-pole, drive asymmetry can reduce confinement and implosion efficiency, driving a bulk motion ofthe hot spot that is detectable with neutron diagnostics. Understanding and removing sources of mode 1 asymmetry inICF implosions is important for improving performance, and the three-dimensional nature of the problem makes high-resolution radiation-hydrodynamic modeling extremely computationally expensive. This work describes a reducedorder view factor model that calculates the drive asymmetry induced by beam-to-beam variations in laser delivery andhohlraum diagnostic windows along the equator. Capsule response is estimated by coupling to a Green’s function thatrelates final hot spot velocity to the applied time-varying mode 1 asymmetry. The model makes several predictionsabout the impact of mode 1 drivers such as laser delivery and target misalignment, and achieves good agreementin both magnitude and vector direction for several shots in three families of high-performance platforms. However,notable discrepancies suggest other potential sources of mode 1 asymmetry not captured by the model are also at play

Authors:

^[1];

^[1]; Casey, D. T. ^[1]; MacGowan, B. J. ^[1];

^[1];

^[1]

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

Publication Date:: Tue Aug 04 00:00:00 EDT 2020

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

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

OSTI Identifier:: 1650438

Alternate Identifier(s):: OSTI ID: 1644729

Report Number(s):: LLNL-JRNL-807170
Journal ID: ISSN 1070-664X; 1010495; TRN: US2202724

Grant/Contract Number:: AC52-07NA27344

Resource Type:: Accepted Manuscript

Journal Name:: Physics of Plasmas

Additional Journal Information:: Journal Volume: 27; 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

Citation Formats


                    Young, C. V., Masse, L., Casey, D. T., MacGowan, B. J., Landen, O. L., Callahan, D. A., Meezan, N. B., Nora, R., and Patel, P. K. View factor estimation of hot spot velocities in inertial confinement fusion implosions at the National Ignition Facility.  United States: N. p., 2020. 
Web.  doi:10.1063/5.0009746.

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                    Young, C. V., Masse, L., Casey, D. T., MacGowan, B. J., Landen, O. L., Callahan, D. A., Meezan, N. B., Nora, R., & Patel, P. K. View factor estimation of hot spot velocities in inertial confinement fusion implosions at the National Ignition Facility.  United States.  https://doi.org/10.1063/5.0009746

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                    Young, C. V., Masse, L., Casey, D. T., MacGowan, B. J., Landen, O. L., Callahan, D. A., Meezan, N. B., Nora, R., and Patel, P. K. Tue .  
"View factor estimation of hot spot velocities in inertial confinement fusion implosions at the National Ignition Facility".  United States.  https://doi.org/10.1063/5.0009746.  https://www.osti.gov/servlets/purl/1650438.

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@article{osti_1650438,

  title        = {View factor estimation of hot spot velocities in inertial confinement fusion implosions at the National Ignition Facility},

  author       = {Young, C. V. and Masse, L. and Casey, D. T. and MacGowan, B. J. and Landen, O. L. and Callahan, D. A. and Meezan, N. B. and Nora, R. and Patel, P. K.},

  abstractNote = {nertial confinement fusion (ICF) experiments at the National Ignition Facility (NIF) suffer from asymmetries in thex-ray drive that degrade capsule performance compared to expectations for a symmetric one-dimensional implosion.Mode 1, or pole-to-pole, drive asymmetry can reduce confinement and implosion efficiency, driving a bulk motion ofthe hot spot that is detectable with neutron diagnostics. Understanding and removing sources of mode 1 asymmetry inICF implosions is important for improving performance, and the three-dimensional nature of the problem makes high-resolution radiation-hydrodynamic modeling extremely computationally expensive. This work describes a reducedorder view factor model that calculates the drive asymmetry induced by beam-to-beam variations in laser delivery andhohlraum diagnostic windows along the equator. Capsule response is estimated by coupling to a Green’s function thatrelates final hot spot velocity to the applied time-varying mode 1 asymmetry. The model makes several predictionsabout the impact of mode 1 drivers such as laser delivery and target misalignment, and achieves good agreementin both magnitude and vector direction for several shots in three families of high-performance platforms. However,notable discrepancies suggest other potential sources of mode 1 asymmetry not captured by the model are also at play},

  doi          = {10.1063/5.0009746},

  journal      = {Physics of Plasmas},

  number       = 8,

  volume       = 27,

  place        = {United States},

  year         = {Tue Aug 04 00:00:00 EDT 2020},

  month        = {Tue Aug 04 00:00:00 EDT 2020}

}

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Works referenced in this record:

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Title: View factor estimation of hot spot velocities in inertial confinement fusion implosions at the National Ignition Facility

Abstract

Citation Formats

Using multiple neutron time of flight detectors to determine the hot spot velocity journal, October 2018

The influence of hohlraum dynamics on implosion symmetry in indirect drive inertial confinement fusion experiments journal, August 2018

Testing a new NIF neutron time-of-flight detector with a bibenzyl scintillator on OMEGA journal, October 2012

The impact of laser plasma interactions on three-dimensional drive symmetry in inertial confinement fusion implosions journal, July 2014

Modeling the 3-D structure of ignition experiments at the NIF journal, March 2020

Relativistic calculation of fusion product spectra for thermonuclear plasmas journal, November 1998

Fusion Energy Output Greater than the Kinetic Energy of an Imploding Shell at the National Ignition Facility journal, June 2018

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

Velocity correction for neutron activation diagnostics at the NIF journal, October 2018

A simulation-based model for understanding the time dependent x-ray drive asymmetries and error bars in indirectly driven implosions on the National Ignition Facility journal, June 2019

Acceleration and deceleration model of indirect drive ICF capsules journal, November 2006

Radiation transport between two concentric spheres journal, December 2000

Simultaneous visualization of wall motion, beam propagation, and implosion symmetry on the National Ignition Facility (invited) journal, October 2018

Impact of temperature-velocity distribution on fusion neutron peak shape journal, May 2017

Metrics for long wavelength asymmetries in inertial confinement fusion implosions on the National Ignition Facility journal, April 2014

Development of the indirect‐drive approach to inertial confinement fusion and the target physics basis for ignition and gain journal, November 1995

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

An analytic asymmetric-piston model for the impact of mode-1 shell asymmetry on ICF implosions journal, June 2020

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

Mode 1 drive asymmetry in inertial confinement fusion implosions on the National Ignition Facility journal, April 2014

The National Ignition Facility neutron time-of-flight system and its initial performance (invited) journal, October 2010

Three-dimensional modeling and hydrodynamic scaling of National Ignition Facility implosions journal, May 2019

Dynamic symmetry of indirectly driven inertial confinement fusion capsules on the National Ignition Facility journal, May 2014

Short-wavelength and three-dimensional instability evolution in National Ignition Facility ignition capsule designs journal, August 2011

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

Using multiple neutron time of flight detectors to determine the hot spot velocity
journal, October 2018

The influence of hohlraum dynamics on implosion symmetry in indirect drive inertial confinement fusion experiments
journal, August 2018

Testing a new NIF neutron time-of-flight detector with a bibenzyl scintillator on OMEGA
journal, October 2012

The impact of laser plasma interactions on three-dimensional drive symmetry in inertial confinement fusion implosions
journal, July 2014

Modeling the 3-D structure of ignition experiments at the NIF
journal, March 2020

Relativistic calculation of fusion product spectra for thermonuclear plasmas
journal, November 1998

Fusion Energy Output Greater than the Kinetic Energy of an Imploding Shell at the National Ignition Facility
journal, June 2018

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

Velocity correction for neutron activation diagnostics at the NIF
journal, October 2018

A simulation-based model for understanding the time dependent x-ray drive asymmetries and error bars in indirectly driven implosions on the National Ignition Facility
journal, June 2019

Acceleration and deceleration model of indirect drive ICF capsules
journal, November 2006

Radiation transport between two concentric spheres
journal, December 2000

Simultaneous visualization of wall motion, beam propagation, and implosion symmetry on the National Ignition Facility (invited)
journal, October 2018

Impact of temperature-velocity distribution on fusion neutron peak shape
journal, May 2017

Metrics for long wavelength asymmetries in inertial confinement fusion implosions on the National Ignition Facility
journal, April 2014

Development of the indirect‐drive approach to inertial confinement fusion and the target physics basis for ignition and gain
journal, November 1995

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

An analytic asymmetric-piston model for the impact of mode-1 shell asymmetry on ICF implosions
journal, June 2020

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

Mode 1 drive asymmetry in inertial confinement fusion implosions on the National Ignition Facility
journal, April 2014

The National Ignition Facility neutron time-of-flight system and its initial performance (invited)
journal, October 2010

Three-dimensional modeling and hydrodynamic scaling of National Ignition Facility implosions
journal, May 2019

Dynamic symmetry of indirectly driven inertial confinement fusion capsules on the National Ignition Facility
journal, May 2014

Short-wavelength and three-dimensional instability evolution in National Ignition Facility ignition capsule designs
journal, August 2011

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