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

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

Journal Article · Sun Feb 10 23:00:00 EST 2019 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.5082960· OSTI ID:1498079

Davies, J. R. ^[1]; ^[2]; Betti, R. ^[2]; Campbell, E. M. ^[2]; Glebov, V. Yu. ^[2]; Hansen, E. C. ^[2]; Knauer, J. P. ^[2]; ^[2]; Sefkow, A. B. ^[2]

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

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.

View Accepted Manuscript (DOE)

Research Organization:: Laboratory for Laser Energetics, University of Rochester

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

Contributing Organization:: Laboratory for Laser Energetics, University of Rochester

Grant/Contract Number:: NA0003856

OSTI ID:: 1498079

Report Number(s):: 2018-304, 1490, 2429; 2018-304, 1470, 2429

Journal Information:: Physics of Plasmas, Journal Name: Physics of Plasmas Journal Issue: 2 Vol. 26; ISSN 1070-664X

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited By (2)

Retrospective of the ARPA-E ALPHA Fusion Program Nehl, C. L.; Umstattd, R. J.; Regan, W. R. Journal of Fusion Energy, Vol. 38, Issue 5-6 https://doi.org/10.1007/s10894-019-00226-4	journal	October 2019
Retrospective of the ARPA-E ALPHA fusion program Nehl, C. L.; Umstattd, R. J.; Regan, W. R. arXiv https://doi.org/10.48550/arxiv.1907.09921	text	January 2019

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