Inferring fuel areal density from secondary neutron yields in laserdriven 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 laserdriven magnetized liner inertial fusion (MagLIF) targets on OMEGA, where ρR is certainly less than 4 mg/cm^{2}. 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 1D and 2D magnetohydrodynamic simulations for nominal laser and target parameters, which predict areal densities 2× to 3× higher than the measurements.
 Authors:

 Univ. of Rochester, NY (United States). Lab. for Laser Energetics
 Publication Date:
 Research Org.:
 Univ. of Rochester, NY (United States). Lab. for Laser Energetics
 Sponsoring Org.:
 USDOE Advanced Research Projects Agency  Energy (ARPAE)
 Contributing Org.:
 Laboratory for Laser Energetics, University of Rochester
 OSTI Identifier:
 1498079
 Report Number(s):
 2018304, 1490, 2429
Journal ID: ISSN 1070664X; 2018304, 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 1070664X
 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 laserdriven magnetized liner inertial fusion. United States: N. p., 2019.
Web. https://doi.org/10.1063/1.5082960.
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 laserdriven magnetized liner inertial fusion. United States. https://doi.org/10.1063/1.5082960
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 laserdriven magnetized liner inertial fusion". United States. https://doi.org/10.1063/1.5082960. https://www.osti.gov/servlets/purl/1498079.
@article{osti_1498079,
title = {Inferring fuel areal density from secondary neutron yields in laserdriven 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 laserdriven 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 1D and 2D 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}
}
Web of Science
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