Open AccessMeasurements of the Conduction-Zone Length and Mass Ablation Rate in Cryogenic Direct-Drive Implosions on OMEGA
Author(s) -
D. T. Michel,
A. K. Davis,
V. N. Goncharov,
T. C. Sangster,
S. X. Hu,
I. V. Igumenshchev,
D. D. Meyerhofer,
W. Seka,
D. H. Froula
Publication year - 2015
Publication title -
physical review letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.688
H-Index - 673
eISSN - 1079-7114
pISSN - 0031-9007
DOI - 10.1103/physrevlett.114.155002
Subject(s) - thermal conduction , ablation , materials science , absorption (acoustics) , laser ablation , atomic physics , laser , electron , omega , physics , nuclear physics , optics , thermodynamics , quantum mechanics , engineering , aerospace engineering
Measurements of the conduction-zone length (110±20 μm at t=2.8 ns), the averaged mass ablation rate of the deuterated plastic (7.95±0.3 μg/ns), shell trajectory, and laser absorption are made in direct-drive cryogenic implosions and are used to quantify the electron thermal transport through the conduction zone. Hydrodynamic simulations that use nonlocal thermal transport and cross-beam energy transfer models reproduce these experimental observables. Hydrodynamic simulations that use a time-dependent flux-limited model reproduce the measured shell trajectory and the laser absorption but underestimate the mass ablation rate by ∼10% and the length of the conduction zone by nearly a factor of 2.
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