Details

Autor(en) / Beteiligte

• Weber, C R
• Döppner, T
• Casey, D T
• Bunn, T L
• Carlson, L C
• Dylla-Spears, R J
• Kozioziemski, B J
• MacPhee, A G
• Nikroo, A
• Robey, H F
• Sater, J D
• Smalyuk, V A

Titel

First Measurements of Fuel-Ablator Interface Instability Growth in Inertial Confinement Fusion Implosions on the National Ignition Facility

Ist Teil von

• Physical review letters, 2016-08, Vol.117 (7), p.075002-075002, Article 075002

Ort / Verlag

United States: American Physical Society

Erscheinungsjahr

2016

Link zum Volltext

Quelle

American Physical Society

Beschreibungen/Notizen

• Direct measurements of hydrodynamic instability growth at the fuel-ablator interface in inertial confinement fusion (ICF) implosions are reported for the first time. These experiments investigate one of the degradation mechanisms behind the lower-than-expected performance of early ICF implosions on the National Ignition Facility. Face-on x-ray radiography is used to measure instability growth occurring between the deuterium-tritium fuel and the plastic ablator from well-characterized perturbations. This growth starts in two ways through separate experiments-either from a preimposed interface modulation or from ablation front feedthrough. These experiments are consistent with analytic modeling and radiation-hydrodynamic simulations, which say that a moderately unstable Atwood number and convergence effects are causing in-flight perturbation growth at the interface. The analysis suggests that feedthrough from outersurface perturbations dominates the interface perturbation growth at mode 60.