Hybrid PIC–fluid simulations for fast electron transport in a silicon target

Yang, X. H.; Chen, Z. H.; Xu, Han; Ma, Yunlong; Zhang, Guo-Bo; Zou, D. B.; Shao, F. Q.

doi:10.1063/5.0137973

Cited by 4 publications

(1 citation statement)

References 39 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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Rotation of self-generated electromagnetic fields by the Nernst effect and Righi–Leduc flux during an intense laser interaction with targets

Zhao,

Yang,

Chen

et al. 2024

New J. Phys.

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The effect of an external magnetic field on the evolution of the self-generated electromagnetic field during laser ablation is investigated by using the Vlasov-Fokker-Planck simulations. It is found that the self-generated field is rotated and distorted under an external magnetic field, and for highly magnetized plasma, the rotation of the electric field becomes stable after the laser ablation. The theoretical analysis indicates that the rotation and tortuosity are primarily attributed to the advection of the Nernst effect and the Righi-Leduc (RL) flux. The curl of the self-generated field increases with the Hall parameter χe and reaches a peak at χe = 0.075, then it decreases with the χe continuous increase. As the Hall parameter increases, the RL flux contributes more than 60% to the rotation of the electric field. Furthermore, the distortion of the electric field continues to rotate after the laser ablation due to the cross-gradient Nernst transport. These findings provide theoretical references for the evolution of the self-generated electromagnetic field in laser-driven magnetized plasmas.

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Role of nonlocal heat transport on the laser ablative Rayleigh-Taylor instability

Chen,

Yang,

Zhang

et al. 2024

Nucl. Fusion

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Ablative Rayleigh-Taylor instability (ARTI) and nonlocal heat transport are the critical problems in laser-driven inertial confinement fusion, while their coupling with each other is not completely understood yet. Here the ARTI in the presence of nonlocal heat transport is studied self-consistently for the first time theoretically and by using radiation hydrodynamic simulations. It is found that the nonlocal heat flux generated by the hot electron transport tends to attenuate the growth of instability, especially for short wavelength perturbations. A linear theory of the ARTI coupled with the nonlocal heat flux is developed, and a prominent stabilization of the ablation front via the nonlocal heat flux is found, in good agreement with numerical simulations. This effect becomes more significant as the laser intensity increases. Our results should have important references for the target designing for inertial confinement fusion.

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Hybrid PIC–fluid simulations for fast electron transport in a silicon target

Cited by 4 publications

References 39 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

Rotation of self-generated electromagnetic fields by the Nernst effect and Righi–Leduc flux during an intense laser interaction with targets

Role of nonlocal heat transport on the laser ablative Rayleigh-Taylor instability

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