研究目的
Investigating the scale invariance of Rayleigh-Taylor instability growth in laser-driven cylindrical implosion experiments.
研究成果
The experiments demonstrated that Rayleigh-Taylor instability growth is hydrodynamically scale invariant in convergent cylindrical implosions over a factor of 3 increase in radial dimension and implosion timescale. The platform enables detailed cross comparisons between small targets fielded at OMEGA and larger targets fielded at the NIF, facilitating large statistically significant datasets for hydrodynamics studies in convergent geometry.
研究不足
The experiments were limited by the differences in laser drive conditions between the OMEGA and NIF facilities, and the targets were not exactly hydroscaled due to fabrication constraints. The simulations included an ad hoc laser power multiplier to account for unmodeled laser plasma instabilities.
1：Experimental Design and Method Selection:
The experiment involved cylindrical implosions driven by laser irradiation, with targets varying in radial dimension and implosion timescale by a factor of 3. The instability growth at an embedded aluminum interface was observed as it converged radially inward and decelerated on a central foam core.
2：The instability growth at an embedded aluminum interface was observed as it converged radially inward and decelerated on a central foam core.
Sample Selection and Data Sources:
2. Sample Selection and Data Sources: Targets included an epoxy (CH) ablator with an embedded aluminum marker band and a central CH foam. The initial perturbation on the inner surface of the aluminum marker was a single-mode m = 20 azimuthal perturbation.
3：List of Experimental Equipment and Materials:
The OMEGA laser facility and the National Ignition Facility (NIF) were used to drive the implosions. The targets were imaged using backlighter x rays produced by illuminating a backlighter foil attached to one end of the cylindrical target.
4：Experimental Procedures and Operational Workflow:
The targets were driven with laser beams in a Gaussian square pulse, and the instability growth was measured using radiographic data from time-gated framing cameras.
5：Data Analysis Methods:
The growth factors were inferred from the radiographic data, and the results were compared with predictions from radiation-hydrodynamics simulations.
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