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Title: Fuel-shell interface instability growth effects on the performance of room temperature direct-drive implosions

Abstract

Performance degradation in direct-drive inertial confinement fusion implosions is caused by several effects, one of which is Rayleigh-Taylor (RT) instability growth during the deceleration phase. In room-temperature plastic target implosions, deceleration-phase RT growth is enhanced by the density discontinuity and finite Atwood number at the fuel-shell interface. In this paper, the Atwood number of the interface is systematically varied by altering the ratio of deuterium to tritium (D:T) within the DT gas fill. It is shown that the stability of the interface is best characterized by the effective Atwood number, which is primarily determined by radiation heating of the shell and not by the composition of the fuel. Both simulation and experimental data show that yield performance scales with the fraction of D and T present in the fuel and that the observed inferred ion temperature asymmetry $$(ΔT_i = T_i^{max} - T_i^{min})$$, which indicates the presence of long-wavelength modes, has a small sensitivity to the different D:T ratios.

Authors:
ORCiD logo [1];  [2];  [2];  [2]; ORCiD logo [2];  [1]
  1. Univ. of Rochester, NY (United States). Lab. for Laser Energetics, and Dept. of Mechanical Engineering
  2. 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 National Nuclear Security Administration (NNSA)
OSTI Identifier:
1567842
Report Number(s):
2018-331, 2479, 1519
Journal ID: ISSN 1070-664X; 2018-331, 2479, 1519
Grant/Contract Number:  
NA0001944
Resource Type:
Accepted Manuscript
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 26; Journal Issue: 8; Journal ID: ISSN 1070-664X
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY

Citation Formats

Miller, S. C., Knauer, J. P., Forrest, C. J., Glebov, V. Yu., Radha, P. B., and Goncharov, V. N. Fuel-shell interface instability growth effects on the performance of room temperature direct-drive implosions. United States: N. p., 2019. Web. doi:10.1063/1.5104338.
Miller, S. C., Knauer, J. P., Forrest, C. J., Glebov, V. Yu., Radha, P. B., & Goncharov, V. N. Fuel-shell interface instability growth effects on the performance of room temperature direct-drive implosions. United States. doi:10.1063/1.5104338.
Miller, S. C., Knauer, J. P., Forrest, C. J., Glebov, V. Yu., Radha, P. B., and Goncharov, V. N. Thu . "Fuel-shell interface instability growth effects on the performance of room temperature direct-drive implosions". United States. doi:10.1063/1.5104338. https://www.osti.gov/servlets/purl/1567842.
@article{osti_1567842,
title = {Fuel-shell interface instability growth effects on the performance of room temperature direct-drive implosions},
author = {Miller, S. C. and Knauer, J. P. and Forrest, C. J. and Glebov, V. Yu. and Radha, P. B. and Goncharov, V. N.},
abstractNote = {Performance degradation in direct-drive inertial confinement fusion implosions is caused by several effects, one of which is Rayleigh-Taylor (RT) instability growth during the deceleration phase. In room-temperature plastic target implosions, deceleration-phase RT growth is enhanced by the density discontinuity and finite Atwood number at the fuel-shell interface. In this paper, the Atwood number of the interface is systematically varied by altering the ratio of deuterium to tritium (D:T) within the DT gas fill. It is shown that the stability of the interface is best characterized by the effective Atwood number, which is primarily determined by radiation heating of the shell and not by the composition of the fuel. Both simulation and experimental data show that yield performance scales with the fraction of D and T present in the fuel and that the observed inferred ion temperature asymmetry $(ΔT_i = T_i^{max} - T_i^{min})$, which indicates the presence of long-wavelength modes, has a small sensitivity to the different D:T ratios.},
doi = {10.1063/1.5104338},
journal = {Physics of Plasmas},
number = 8,
volume = 26,
place = {United States},
year = {2019},
month = {8}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record

Figures / Tables:

FIG. 1 FIG. 1: The fuel-shell interface of room temperature targets during the deceleration phase is classically unstable due to the jump in density. The hydrodynamic profile above is shown during the deceleration phase at the time of peak compression.

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