Evidence of non-Maxwellian ion velocity distributions in spherical shock-driven implosions
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22ja046_full.pdf
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Author(s)
Mannion, O.
Taitano, W.T.
Appelbe, B.D.
Crilly, A.J.
Forrest, C.J.
Glebov, V. Yu.
Knauer, J.P.
McKenty, P.W.
Mohamed, Z.L.
Stoeckl, C.
Date Issued
February 2022
Journal
Physical Review. E, Statistical physics, plasmas, fluids, and related interdisciplinary topics
Publisher
APS
Abstract
The ion velocity distribution functions of thermonuclear plasmas generated by spherical laser direct drive implosions are studied using deuterium-tritium (DT) and deuterium-deuterium (DD) fusion neutron energy spectrum measurements. A hydrodynamic Maxwellian plasma model accurately describes measurements made from lower temperature (< 10 keV), hydrodynamic like plasmas, but is insufficient to describe measurements made from higher temperature more kinetic like plasmas. The high temperature measurements are more consistent with Vlasov-Fokker-Planck (VFP) simulation results which predict the presence of a bimodal plasma ion velocity distribution near peak neutron production. These measurements provide direct experimental evidence of non-Maxwellian ion velocity distributions in spherical shock driven implosions and provide useful data for benchmarking kinetic VFP simulations.
Description
Submitted for publication in Physical Review. E, Statistical physics, plasmas, fluids, and related interdisciplinary topics
MIT Department
Massachusetts Institute of Technology. Plasma Science and Fusion Center
Persistent DSpace Link
DOI of Published Version
https://doi.org/10.1103/physreve.108.035201
