Inferring fuel areal density from secondary neutron yields in laser-driven magnetized liner inertial fusion

Davies, J. R.; Barnak, D. H.; Betti, R.; Campbell, E. M.; Glebov, V. Yu.; Hansen, E. C.; Knauer, J. P.; Peebles, J. L.; Sefkow, A. B.

doi:10.1063/1.5082960

Title: Inferring fuel areal density from secondary neutron yields in laser-driven magnetized liner inertial fusion

Abstract

A technique to infer the areal density ρR of compressed deuterium (D) in cylindrical implosions from the ratio of secondary D–T (deuterium–tritium) neutrons to primary D–D neutrons is described and evaluated. For ρR to be proportional to the ratio of D–T to D–D yield, the increase in the D–T fusion cross section with collisional slowing of the tritium must be small, requiring where TkeV is the electron temperature in keV. The technique is applied to results from laser-driven magnetized liner inertial fusion (MagLIF) targets on OMEGA, where ρR is certainly less than 4 mg/cm². OMEGA MagLIF targets do not achieve a sufficiently high, radially integrated, axial magnetic field BR to confine the tritium, as occurs in Z MagLIF targets, because they are ~10× smaller in radius. The inferred areal densities show that fuel convergence is reduced by preheating, by an applied axial magnetic field, and by increasing the initial fuel density, which are key features of the MagLIF scheme. The results are compared with 1-D and 2-D magnetohydrodynamic simulations for nominal laser and target parameters, which predict areal densities 2× to 3× higher than the measurements.

Authors:

Davies, J. R. ^[1];

^[1]; Betti, R. ^[1]; Campbell, E. M. ^[1]; Glebov, V. Yu. ^[1]; Hansen, E. C. ^[1]; Knauer, J. P. ^[1];

^[1]; Sefkow, A. B. ^[1]

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

Publication Date:: 2019-02-11

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

Sponsoring Org.:: USDOE Advanced Research Projects Agency - Energy (ARPA-E)

Contributing Org.:: Laboratory for Laser Energetics, University of Rochester

OSTI Identifier:: 1498079

Report Number(s):: 2018-304, 1490, 2429
Journal ID: ISSN 1070-664X; 2018-304, 1470, 2429

Grant/Contract Number:: NA0003856

Resource Type:: Accepted Manuscript

Journal Name:: Physics of Plasmas

Additional Journal Information:: Journal Volume: 26; Journal Issue: 2; Journal ID: ISSN 1070-664X

Publisher:: American Institute of Physics (AIP)

Country of Publication:: United States

Language:: English

Citation Formats


                    Davies, J. R., Barnak, D. H., Betti, R., Campbell, E. M., Glebov, V. Yu., Hansen, E. C., Knauer, J. P., Peebles, J. L., and Sefkow, A. B. Inferring fuel areal density from secondary neutron yields in laser-driven magnetized liner inertial fusion.  United States: N. p., 2019. 
Web.  doi:10.1063/1.5082960.

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                    Davies, J. R., Barnak, D. H., Betti, R., Campbell, E. M., Glebov, V. Yu., Hansen, E. C., Knauer, J. P., Peebles, J. L., & Sefkow, A. B. Inferring fuel areal density from secondary neutron yields in laser-driven magnetized liner inertial fusion.  United States.  https://doi.org/10.1063/1.5082960

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                    Davies, J. R., Barnak, D. H., Betti, R., Campbell, E. M., Glebov, V. Yu., Hansen, E. C., Knauer, J. P., Peebles, J. L., and Sefkow, A. B. Mon .  
"Inferring fuel areal density from secondary neutron yields in laser-driven magnetized liner inertial fusion".  United States.  https://doi.org/10.1063/1.5082960.  https://www.osti.gov/servlets/purl/1498079.

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@article{osti_1498079,

  title        = {Inferring fuel areal density from secondary neutron yields in laser-driven magnetized liner inertial fusion},

  author       = {Davies, J. R. and Barnak, D. H. and Betti, R. and Campbell, E. M. and Glebov, V. Yu. and Hansen, E. C. and Knauer, J. P. and Peebles, J. L. and Sefkow, A. B.},

  abstractNote = {A technique to infer the areal density ρR of compressed deuterium (D) in cylindrical implosions from the ratio of secondary D–T (deuterium–tritium) neutrons to primary D–D neutrons is described and evaluated. For ρR to be proportional to the ratio of D–T to D–D yield, the increase in the D–T fusion cross section with collisional slowing of the tritium must be small, requiring where TkeV is the electron temperature in keV. The technique is applied to results from laser-driven magnetized liner inertial fusion (MagLIF) targets on OMEGA, where ρR is certainly less than 4 mg/cm2. OMEGA MagLIF targets do not achieve a sufficiently high, radially integrated, axial magnetic field BR to confine the tritium, as occurs in Z MagLIF targets, because they are ~10× smaller in radius. The inferred areal densities show that fuel convergence is reduced by preheating, by an applied axial magnetic field, and by increasing the initial fuel density, which are key features of the MagLIF scheme. The results are compared with 1-D and 2-D magnetohydrodynamic simulations for nominal laser and target parameters, which predict areal densities 2× to 3× higher than the measurements.},

  doi          = {10.1063/1.5082960},

  journal      = {Physics of Plasmas},

  number       = 2,

  volume       = 26,

  place        = {United States},

  year         = {2019},

  month        = {2}

}

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Works referenced in this record:

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Experimental Demonstration of Fusion-Relevant Conditions in Magnetized Liner Inertial Fusion
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journal, May 2017

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Works referencing / citing this record:

Retrospective of the ARPA-E ALPHA Fusion Program
journal, October 2019

Nehl, C. L.; Umstattd, R. J.; Regan, W. R.
Journal of Fusion Energy, Vol. 38, Issue 5-6
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text, January 2019

Nehl, C. L.; Umstattd, R. J.; Regan, W. R.
arXiv
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Similar Records

Title: Inferring fuel areal density from secondary neutron yields in laser-driven magnetized liner inertial fusion

Abstract

Citation Formats

Using nuclear data and Monte Carlo techniques to study areal density and mix in D2 implosions journal, March 2005

Design of magnetized liner inertial fusion experiments using the Z facility journal, July 2014

Improved formulas for fusion cross-sections and thermal reactivities journal, April 1992

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Understanding Fuel Magnetization and Mix Using Secondary Nuclear Reactions in Magneto-Inertial Fusion journal, October 2014

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Experimental Demonstration of Fusion-Relevant Conditions in Magnetized Liner Inertial Fusion journal, October 2014

The importance of electrothermal terms in Ohm's law for magnetized spherical implosions journal, November 2015

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Using nuclear data and Monte Carlo techniques to study areal density and mix in D2 implosions
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Understanding Fuel Magnetization and Mix Using Secondary Nuclear Reactions in Magneto-Inertial Fusion
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Laser entrance window transmission and reflection measurements for preheating in magnetized liner inertial fusion
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Experimental Demonstration of Fusion-Relevant Conditions in Magnetized Liner Inertial Fusion
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The importance of electrothermal terms in Ohm's law for magnetized spherical implosions
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Neutron spectra from inertial confinement fusion targets for measurement of fuel areal density and charged particle stopping powers
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A new simple formula for fusion cross-sections of light nuclei
journal, November 2008

Measuring implosion velocities in experiments and simulations of laser-driven cylindrical implosions on the OMEGA laser
journal, April 2018

Three‐dimensional simulations of Nova high growth factor capsule implosion experiments
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Improved formulas for fusion cross-sections and thermal reactivities
journal, December 1993

Laser-driven magnetized liner inertial fusion on OMEGA
journal, May 2017

Experimental determination of fuel density‐radius product of inertial confinement fusion targets using secondary nuclear fusion reactions
journal, September 1986

Optimization of laser-driven cylindrical implosions on the OMEGA laser
journal, December 2018

Laser-driven magnetized liner inertial fusion
journal, June 2017

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