Abstract
Shock-ignited inertial fusion targets are studied by one dimensional and two-dimensional numerical simulations. Most of the study refers to the simple all-DT HiPER baseline target (imploded mass of 0.29 mg); both the reference laser wavelength λ = 0.35 μm, and λ = 0.25 μm are considered. The target achieves 1D gain about 80 (120) with total laser energy of 260 kJ (180 kJ) at λ = 0.35 μm (0.25 μm). Operating windows for the parameters of the laser ignition spike are described. According to preliminary simulations, gain 80–100 is also obtained by a scaled target (imploded mass of 1.8 mg) driven by 1.5 MJ of green laser light (0.53 μm). Two dimensional simulations indicate robustness to irradiation nonuniformities, and high sensitivity to target mispositioning. This can however be reduced by increasing the power of the ignition spike.
Highlights
Shock ignition [1, 2] is a recently proposed inertial confinement fusion (ICF) scheme, in which distinct pulses are used to precompress the fuel and to generate the central ignition hot spot
We have studied simple shock ignition targets by means of 1D and 2D simulations
According to 1D simulations they can achieve high gain at laser energy of a few hundred kJ, and laser wavelengths of 0.35 or 0.25 m. 1D gain about 100 is computed for a target driven by 1.5 MJ of green light ( = 0.53 m)
Summary
Shock ignition [1, 2] is a recently proposed inertial confinement fusion (ICF) scheme, in which distinct pulses are used to precompress the fuel and to generate the central ignition hot spot. This shock wave eventually leads to multiplication of the central pressure by a factor 3–4, and to hot spot ignition. In a previous paper [9] we have analyzed a simple all-DT target, driven by pulses with = 0.35 m and total energy of 250–300 kJ.
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