Inferring thermal ion temperature and residual kinetic energy from nuclear measurements in inertial confinement fusion implosions

Woo, K. M.; Betti, R.; Mannion, O. M.; Forrest, C. J.; Knauer, J. P.; Goncharov, V. N.; Radha, P. B.; Patel, D.; Gopalaswamy, V.; Glebov, V. Yu.

doi:10.1063/1.5144460

Title: Inferring thermal ion temperature and residual kinetic energy from nuclear measurements in inertial confinement fusion implosions

Abstract

In inertial con finement fusion implosion experiments, the presence of residual anisotropic fluid motion within the stagnating hot spot leads to signifi cant variations in ion-temperature measurements using neutron time- of-flight detectors along different lines of sight. The minimum ion-temperature measurement is typically used as representative of the thermal temperature. In the presence of isotropic flows, however, even the minimum DT neutron-inferred ion temperature can be well above the plasma thermal temperature. Using both DD and DT neutron-inferred ion-temperature measurements, we show that it is possible to determine the contribution of isotropic flows and infer the DT burn-averaged thermal ion temperature. The contribution of large isotropic flows on driving the ratio of DD to DT neutron-inferred ion temperatures well below unity and approaching the lower bound of 0.8 is demonstrated in multimode simulations. The minimum DD neutron- inferred ion temperature is determined from the velocity variance analysis, accounting for the presence of isotropic flows. Being close to the DT burn-averaged thermal ion temperature, the inferred DD minimum ion temperatures demonstrate a strong correlation with the experimental yields in the OMEGA implosion database. An analytical expression is also derived to explain the effect of mode ℓ = 1 ion-temperature measurement asymmetrymore »« less

Authors:

^[1]; Betti, R. ^[1];

^[1]; Forrest, C. J. ^[1]; Knauer, J. P. ^[1]; Goncharov, V. N. ^[1];

^[1]; Patel, D. ^[1];

^[1];

^[1]

Univ. of Rochester, NY (United States). Lab. for Laser Energetics

Publication Date:: Mon Jun 01 00:00:00 EDT 2020

Research Org.:: Univ. of Rochester, NY (United States). Lab. for Laser Energetics

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

OSTI Identifier:: 1634008

Alternate Identifier(s):: OSTI ID: 1631390

Report Number(s):: 2019-218, 2524, 1568
Journal ID: ISSN 1070-664X; 2019-218, 2524, 1568; TRN: US2201285

Grant/Contract Number:: NA0003856

Resource Type:: Accepted Manuscript

Journal Name:: Physics of Plasmas

Additional Journal Information:: Journal Volume: 27; Journal Issue: 6; Conference: 61. Annual Meeting of the APS Division of Plasma Physics, Fort Lauderdale, FL (United states), 21-25 Oct 2019; 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


                    Woo, K. M., Betti, R., Mannion, O. M., Forrest, C. J., Knauer, J. P., Goncharov, V. N., Radha, P. B., Patel, D., Gopalaswamy, V., and Glebov, V. Yu. Inferring thermal ion temperature and residual kinetic energy from nuclear measurements in inertial confinement fusion implosions.  United States: N. p., 2020. 
Web.  doi:10.1063/1.5144460.

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                    Woo, K. M., Betti, R., Mannion, O. M., Forrest, C. J., Knauer, J. P., Goncharov, V. N., Radha, P. B., Patel, D., Gopalaswamy, V., & Glebov, V. Yu. Inferring thermal ion temperature and residual kinetic energy from nuclear measurements in inertial confinement fusion implosions.  United States.  https://doi.org/10.1063/1.5144460

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                    Woo, K. M., Betti, R., Mannion, O. M., Forrest, C. J., Knauer, J. P., Goncharov, V. N., Radha, P. B., Patel, D., Gopalaswamy, V., and Glebov, V. Yu. Mon .  
"Inferring thermal ion temperature and residual kinetic energy from nuclear measurements in inertial confinement fusion implosions".  United States.  https://doi.org/10.1063/1.5144460.  https://www.osti.gov/servlets/purl/1634008.

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@article{osti_1634008,

  title        = {Inferring thermal ion temperature and residual kinetic energy from nuclear measurements in inertial confinement fusion implosions},

  author       = {Woo, K. M. and Betti, R. and Mannion, O. M. and Forrest, C. J. and Knauer, J. P. and Goncharov, V. N. and Radha, P. B. and Patel, D. and Gopalaswamy, V. and Glebov, V. Yu.},

  abstractNote = {In inertial con finement fusion implosion experiments, the presence of residual anisotropic fluid motion within the stagnating hot spot leads to signifi cant variations in ion-temperature measurements using neutron time- of-flight detectors along different lines of sight. The minimum ion-temperature measurement is typically used as representative of the thermal temperature. In the presence of isotropic flows, however, even the minimum DT neutron-inferred ion temperature can be well above the plasma thermal temperature. Using both DD and DT neutron-inferred ion-temperature measurements, we show that it is possible to determine the contribution of isotropic flows and infer the DT burn-averaged thermal ion temperature. The contribution of large isotropic flows on driving the ratio of DD to DT neutron-inferred ion temperatures well below unity and approaching the lower bound of 0.8 is demonstrated in multimode simulations. The minimum DD neutron- inferred ion temperature is determined from the velocity variance analysis, accounting for the presence of isotropic flows. Being close to the DT burn-averaged thermal ion temperature, the inferred DD minimum ion temperatures demonstrate a strong correlation with the experimental yields in the OMEGA implosion database. An analytical expression is also derived to explain the effect of mode ℓ = 1 ion-temperature measurement asymmetry on yield degradations caused by the anisotropic flows.},

  doi          = {10.1063/1.5144460},

  journal      = {Physics of Plasmas},

  number       = 6,

  volume       = 27,

  place        = {United States},

  year         = {Mon Jun 01 00:00:00 EDT 2020},

  month        = {Mon Jun 01 00:00:00 EDT 2020}

}

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Similar Records

Title: Inferring thermal ion temperature and residual kinetic energy from nuclear measurements in inertial confinement fusion implosions

Abstract

Citation Formats

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

The effect of turbulent kinetic energy on inferred ion temperature from neutron spectra journal, July 2014

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

Impact of three-dimensional hot-spot flow asymmetry on ion-temperature measurements in inertial confinement fusion experiments journal, October 2018

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Effect of laser illumination nonuniformity on the analysis of time-resolved x-ray measurements in uv spherical transport experiments journal, October 1987

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Interpreting inertial fusion neutron spectra journal, February 2016

Neutron spectrometry—An essential tool for diagnosing implosions at the National Ignition Facility (invited) journal, October 2012

Knudsen Layer Reduction of Fusion Reactivity journal, August 2012

Indications of flow near maximum compression in layered deuterium-tritium implosions at the National Ignition Facility journal, August 2016

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

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

A suite of neutron time-of-flight detectors to measure hot-spot motion in direct-drive inertial confinement fusion experiments on OMEGA journal, June 2020

Three-dimensional modeling of the neutron spectrum to infer plasma conditions in cryogenic inertial confinement fusion implosions journal, April 2018

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Effects of residual kinetic energy on yield degradation and ion temperature asymmetries in inertial confinement fusion implosions journal, May 2018

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The production spectrum in fusion plasmas journal, February 2011

Impact of temperature-velocity distribution on fusion neutron peak shape
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The effect of turbulent kinetic energy on inferred ion temperature from neutron spectra
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Impact of three-dimensional hot-spot flow asymmetry on ion-temperature measurements in inertial confinement fusion experiments
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journal, April 1992

Performance metrics for inertial confinement fusion implosions: Aspects of the technical framework for measuring progress in the National Ignition Campaign
journal, May 2012

Effect of laser illumination nonuniformity on the analysis of time-resolved x-ray measurements in uv spherical transport experiments
journal, October 1987

Integrated modeling of cryogenic layered highfoot experiments at the NIF
journal, May 2016

Interpreting inertial fusion neutron spectra
journal, February 2016

Neutron spectrometry—An essential tool for diagnosing implosions at the National Ignition Facility (invited)
journal, October 2012

Knudsen Layer Reduction of Fusion Reactivity
journal, August 2012

Indications of flow near maximum compression in layered deuterium-tritium implosions at the National Ignition Facility
journal, August 2016

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

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

A suite of neutron time-of-flight detectors to measure hot-spot motion in direct-drive inertial confinement fusion experiments on OMEGA
journal, June 2020

Three-dimensional modeling of the neutron spectrum to infer plasma conditions in cryogenic inertial confinement fusion implosions
journal, April 2018

Improving the hot-spot pressure and demonstrating ignition hydrodynamic equivalence in cryogenic deuterium–tritium implosions on OMEGA
journal, May 2014

Effects of residual kinetic energy on yield degradation and ion temperature asymmetries in inertial confinement fusion implosions
journal, May 2018

Signatures of asymmetry in neutron spectra and images predicted by three-dimensional radiation hydrodynamics simulations of indirect drive implosions
journal, May 2016

Fusion neutron energies and spectra
journal, July 1973

The production spectrum in fusion plasmas
journal, February 2011