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

Xu, Binbin; Ma, Yunlong; Yang, X. H.; Tang, Wenhui; Ge, Z. Y.; Zhao, Yuan; Ke, Yanzhao; Kawata, S.

doi:10.1088/1361-6587/aa80b6

Cited by 4 publications

(1 citation statement)

References 51 publications

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“…Moreover, Fujioka et al [8,9] discovered that two ablation fronts form during the ablation of high-Z doped targets, a phenomenon referred to as the double-ablation front (DAF). Furthermore, it was discovered that the high-Z dopant has the potential to suppress the amplitude and the frequency of ablative Richter-Meyer-Meshkov instability (ARMI) [10,11], and it also improves the fast electron propagation in the fast ignition schemes within ICF [12,13]. It is worth noting that while high-Z dopant are both used in indirect-drive and direct-drive schemes, their specific purposes are different.…”

Section: Introductionmentioning

confidence: 99%

The effect of high-Z dopant on the ablation of carbon–hydrogen polymer target

Xiong,

Yang,

Zhang

et al. 2024

Plasma Phys. Control. Fusion

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High-Z dopants such as chlorine, bromine and silicon in carbon-hydrogen polymer (CH) targets play a crucial role during the ablation of inertial confinement fusion (ICF). These dopants can serve as diagnostic tools in experiments and mitigate hot electron preheating, but they also influence the laser ablation. In this paper, the process of high-power laser ablating doped CH targets has been studied through radiation hydrodynamic simulations. Our findings reveal that the laser absorption rate in the doped targets increase as a result of the increasing electron-ion collision frequency. This leads to the increase of the electron, ion and radiation temperatures. Furthermore, high-Z dopants contribute to a decrease in the ablation pressure, which tends to a constant. Moreover, the saturation phenomenon of the mass ablation rate has been found. For the targets with low doping ratios (e.g. 6.25\%-12.5\%), the mass ablation rate increases until reaching the saturation at a doping ratio of 18.75\%, after which it decreases. This indicates that an appropriate doping ratio can increase the laser absorption and ablation. The results are helpful to comprehensively understand the effects of high-Z dopant on all stages of ICF.

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Section: Introductionmentioning

confidence: 99%

The effect of high-Z dopant on the ablation of carbon–hydrogen polymer target

Xiong,

Yang,

Zhang

et al. 2024

Plasma Phys. Control. Fusion

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High-energy-density plasma jet generated by laser-cone interaction

Yang

et al. 2018

Physics of Plasmas

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The generation of high-energy-density (HED) plasma jet from a laser ablating thin cone target is studied theoretically and by numerical simulations. Theoretical analysis and 1D simulations show that a maximum kinetic energy conversion efficiency (CE) of 26% can be achieved when nearly 80% of the foil is ablated by laser. A HED plasma jet is generated when an intense laser (∼1015 W/cm2) irradiates the cone target, inducing a great enhancement of energy density compared to that of the planar target, which is attributed to the cumulative effect of the cone shape and the new generation mechanism of jet, i.e., laser directly accelerating the cone wall onto the axis. The characteristic of jet is influenced by the cone geometry, i.e., thickness and cone angle. It is found that a cone with a half opening angle around 70° and the optimized thickness (∼5 μm) can induce a jet with a high CE and long duration, whose peak energy density can reach 3.5 × 1015 erg/cm3. The results can be beneficial for laser-driven novel neutron sources and other fusion related experiments, where HED plasma jet can be applied.

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Stabilization of thin-shell implosions using a high-foot adiabat-shaped drive at the National Ignition Facility

Lafon

Bonnefille

2018

Physics of Plasmas

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The thin-shell adiabat-shaped implosions proposed in this paper are designed to combine the ablation front stability benefits of the High Foot (HF) pulses with the demonstrated high fuel compressibility of the low foot implosions to reach the alpha-heating regime. This is accomplished by both lowering the drive between the first and second shocks and tailoring the rise-to-peak drive. Two-dimensional radiation hydrodynamics simulations show that while weakening the growth of low-mode number perturbations at the ablation front, this approach also introduces negative lobes to the growth factor spectrum at high mode numbers. A very-high foot picketless drive, characterized by an intermediate fuel adiabat level, is proposed to suppress negative perturbation growth. Moreover, the picketless feature of this design and the shorter duration of the through reduce the hohlraum wall motion allowing us to keep the capsule implosion symmetry under control. Introducing an accurately tuned dopant fraction in the outer ablator suggests that the stabilization of the ablation front may be even further improved. This study has shown that the smaller oscillation amplitude and the frequency of ablative Richtmyer-Meshkov instability reduce the initial perturbation seed at the beginning of the acceleration phase. The combination of a thin-shell design and a very high-foot picketless radiation drive has enlightened the calculated benefits of this intermediate fuel adiabat design: high implosion performance, more predictive low-mode implosion symmetry, and a similar stability at the ablation front than that of HF designs.

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

Cited by 4 publications

References 51 publications

The effect of high-Z dopant on the ablation of carbon–hydrogen polymer target

The effect of high-Z dopant on the ablation of carbon–hydrogen polymer target

High-energy-density plasma jet generated by laser-cone interaction

Stabilization of thin-shell implosions using a high-foot adiabat-shaped drive at the National Ignition Facility

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