A comparison of three-dimensional multimode hydrodynamic instability growth on various National Ignition Facility capsule designs with HYDRA simulations

Journal Article · Wed Apr 01 04:00:00 EST 1998 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.872643· OSTI ID:599129

Marinak, M M; Haan, S W; Dittrich, T R; Tipton, R E; Zimmerman, G B ^[1]

---

1. Lawrence Livermore National Laboratory, Livermore, California 94551 (United States)

Three similar cryogenic ignition capsule designs for the National Ignition Facility [J. Lindl, Phys. Plasmas {bold 2}, 3933 (1995)] are analyzed to determine surface roughness specifications required to mitigate the growth of hydrodynamic instabilities. These capsule utilize brominated plastic, polyimid and copper-doped beryllium ablator materials respectively. Direct three-dimensional numerical simulations with the HYDRA radiation hydrodynamic code [M. M. Marinak {ital et al.}, Phys. Plasmas {bold 3}, 2070 (1996)] examine the growth of multimode perturbations seeded by roughness on the outer ablator and inner ice surfaces. The simulations, which showed weakly nonlinear behavior for optimized surfaces, were carried through ignition and burn. A three-dimensional multimode perturbation achieves somewhat larger amplitudes in the nonlinear regime than a corresponding two-dimensional simulation of the same rms amplitude. The beryllium and polyimid capsules exhibit enhanced tolerance of roughness on both the ice and ablator surfaces. {copyright} {ital 1998 American Institute of Physics.}

• OSTI ID: 599129
• Journal Information: Physics of Plasmas, Journal Name: Physics of Plasmas Journal Issue: 4 Vol. 5; ISSN PHPAEN; ISSN 1070-664X
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
ABLATION
BERYLLIUM
HYDRODYNAMICS
IMPLOSIONS
INERTIAL CONFINEMENT
LASER-PRODUCED PLASMA
PLASMA INSTABILITY
PLASMA SIMULATION
THREE-DIMENSIONAL CALCULATIONS