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

Miller, S. C.; Knauer, J. P.; Forrest, C. J.; Glebov, V. Yu.; Radha, P. B.; Goncharov, V. N.

doi:10.1063/1.5104338

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

Journal Article · 01 August 2019 · Physics of Plasmas

DOI: https://doi.org/10.1063/1.5104338 · OSTI ID:1567842

^[1]; Knauer, J. P. ^[2]; Forrest, C. J. ^[2]; Glebov, V. Yu. ^[2];

^[2]; Goncharov, V. N. ^[1]

Univ. of Rochester, NY (United States). Lab. for Laser Energetics, and Dept. of Mechanical Engineering
Univ. of Rochester, NY (United States). Lab. for Laser Energetics

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.

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Research Organization:: Univ. of Rochester, NY (United States). Lab. for Laser Energetics

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: NA0001944

OSTI ID:: 1567842

Report Number(s):: 2018-331, 2479, 1519; 2018-331, 2479, 1519; TRN: US2100262

Journal Information:: Physics of Plasmas, Vol. 26, Issue 8; ISSN 1070-664X

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

Country of Publication:: United States

Language:: English

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