Indirect-drive ablative Rayleigh-Taylor growth experiments on the Shenguang-II laser facility

Abstract

In this research, a series of single-mode, indirect-drive, ablative Rayleigh-Taylor (RT) instability experiments performed on the Shenguang-II laser facility [X. T. He and W. Y. Zhang, Eur. Phys. J. D 44, 227 (2007)] using planar target is reported. The simulation results from the one-dimensional hydrocode for the planar foil trajectory experiment indicate that the energy flux at the hohlraum wall is obviously less than that at the laser entrance hole. Furthermore, the non-Planckian spectra of x-ray source can strikingly affect the dynamics of the foil flight and the perturbation growth. Clear images recorded by an x-ray framing camera for the RT growth initiated by small- and large-amplitude perturbations are obtained. The observed onset of harmonic generation and transition from linear to nonlinear growth regime is well predicted by two-dimensional hydrocode simulations.

Intimate relationship between spectroscopy and collisions: a scenario to calculate relevant atomic data for astrophysics

“…For plasmas in astrophysical objects and controlled fusion facilities [1][2][3], data on atomic energy levels and the related collision processes are needed to simulate numerically the temporal-spatial motions of plasmas and to perform diagnostic analysis of plasmaconditions. Obviously, the task to compile such atomic data cannot be done by experimental measurements alone, even with the new telescopes operating over a wider range of wavelengths,the new generation satellite observatories with higher spectroscopic resolution and sensitivities [4], and various advanced facilities for fusion research [5][6][7]. Theoretical computations with sufficiently high precision that matchhigh instrumental resolutionalso play an indispensable role insatisfying such needs.…”

Effect of bromine-dopant on radiation-driven Rayleigh–Taylor instability in plastic foil

“…A single-mode sine perturbation is preset at the ablation front with a wavelength of λ=50 μm and an amplitude of η=0.5 μm. The detailed schematic of the experiment can be found in [38]. Eight laser beams (each beam having a 0.35 μm wavelength and 2 ns duration with an energy output of 0.3 kJ) are focused into an Au hohlraum and generate a ∼140 eV radiation drive, as shown in figure 1(b), to ablate the plastic foil which is mounted across a diagnostic hole on the wall of the Au hohlraum.…”

Progress of indirectly driven implosion experiments

“…1993年XG-I升级为 XG-II, 基频光输出250 J(脉宽1 ns), 增加了倍频晶体, 可以输出二倍频和三倍频激光. 同年, 我国ICF研究纳 图 1 (网络版彩图)中国和美国ICF研究发展简图 2000年SG-II基频出光, 2001年SG-II三倍频出光, 输出能量8×250 J/1ns, 成为我国ICF研究主力实验装 置 [8] , 开展了多轮黑腔 [9] 、流体力学不稳定性 [10] 以及内 爆实验, 并开展了诊断技术研发工作 [11] . 2007年SG-III 原型建成, 8路激光, 输出能量10 kJ(1 ns).…”