A5039772879- Laser-Plasma Interactions and Diagnostics
- High-pressure geophysics and materials
- Laser-Matter Interactions and Applications
- Laser-induced spectroscopy and plasma
- Combustion and Detonation Processes
- Energetic Materials and Combustion
- Pulsed Power Technology Applications
- Nuclear Physics and Applications
- Computational Fluid Dynamics and Aerodynamics
- Particle Dynamics in Fluid Flows
- Plasma and Flow Control in Aerodynamics
- Traumatic Ocular and Foreign Body Injuries
- Tribology and Lubrication Engineering
- Crystallography and Radiation Phenomena
- Gas Dynamics and Kinetic Theory
- Atomic and Molecular Physics
- Fusion materials and technologies
- High-Velocity Impact and Material Behavior
- Lubricants and Their Additives
- Adhesion, Friction, and Surface Interactions
- Advanced Radiotherapy Techniques
Beihang University
2025
Institute of Applied Physics and Computational Mathematics
2012-2023
China Academy of Engineering Physics
2016
Peking University
2016
Shanghai Jiao Tong University
2016
A Lagrangian compatible radiation hydrodynamic algorithm and the nuclear dynamics computing module are developed implemented in LARED Integration code, which is a code based on 2-D cylindrical coordinates for numerical simulation of indirect-drive Inertial Confined Fusion. number 1-D ignition implosion simulations by using improved (ILARED) presented show that results consistent with those computed RDMG, while low-mode radiative asymmetry instability growth, according to physical analysis...
In the deuterium-tritium inertial confinement fusion implosion experiments on National Ignition Facility, measured neutron yield and hot spot pressure are significantly lower than simulations. Understanding underlying physics of deficit is essential to achieving ignition. This paper investigates low-mode areal density asymmetry in main fuel ignition capsule. It shown that breaks up compressed shell reduces conversion kinetic energy internal energy, leading calculated quite close experimental...
Weakly nonlinear (WN) Rayleigh-Taylor instability (RTI) initiated by single-mode cosinusoidal interface and velocity perturbations is investigated analytically up to the third order. Expressions of temporal evolutions amplitudes first three harmonics are derived. It shown that there coupling between perturbations, which plays a prominent role in WN growth. When “equivalent amplitude” initial perturbation, normalized its linear growth rate, compared amplitude them dominates RTI. Furthermore,...
X-ray drive asymmetry is one of the main seeds low-mode implosion that blocks further improvement nuclear performance “high-foot” experiments on National Ignition Facility [Miller et al., Nucl. Fusion 44, S228 (2004)]. More particularly, P2 Au's M-band flux can also severely influence ignition capsules [Li Phys. Plasmas 23, 072705 (2016)]. Here we study smoothing effect mid- and/or high-Z dopants in ablator asymmetries, by modeling and comparing processes a Ge-doped capsule Si-doped driven...
The paper investigates theoretically the sensitivities of ignition capsule implosion performance on hard x-ray spectral distribution hohlraum. In simulation, hohlraum radiation is represented by a Planckian spectrum for main drive plus gaussian bump centered at energy Ec preheating x-rays. Simulation results show that with increasing center Ec, Atwood number fuel-ablator interface increases rapidly due to and expanding inner undoped CH layer. growing indicates hydrodynamic instability (HI)...
In the deuterium-tritium inertial confinement fusion implosion experiments on National Ignition Facility, hot spot and surrounding main fuel layer show obvious P2 asymmetries. This may be caused by large positive radiation flux asymmetry during peak pulse resulting form poor propagation of inner laser beam in gas-filled hohlraum. The symmetry evolution ignition capsule implosions is investigated applying asymmetries different time intervals. A series two-dimensional simulation results that a...
The low-mode shell asymmetry and high-mode hot spot mixing appear to be the main reasons for performance degradation of National Ignition Facility (NIF) implosion experiments. effects mode coupling between P2 radiation flux intermediate-mode L = 24 capsule roughness on ignition are investigated by two-dimensional hydrodynamic simulations. It is shown that amplitudes new modes generated in good agreement with second-order equation during acceleration phase. later flow field not only shows...
The low-mode radiation flux asymmetry in the hohlraum is a main source of performance degradation National Ignition Facility (NIF) implosion experiments. To counteract deleterious effects large positive P2 during peak drive, this paper develops new tuning method called asymmetric-shell ignition capsule design which adopts intentionally asymmetric CH ablator layer or deuterium-tritium (DT) ice layer. A series two-dimensional simulations have been performed, and results show that DT can...
In this paper, a six-cylinder-port hohlraum is proposed to provide high symmetry flux on capsule. It designed ignite capsule with 1.2-mm radius in indirect-drive inertial confinement fusion (ICF). Flux and laser energy are calculated by using three-dimensional view factor method balance hohlraum. Plasma conditions analyzed based the two-dimensional radiation-hydrodynamic simulations. There no Ylm (l ⩽ 4) asymmetry when influences of entrance holes (LEHs) spots cancel each other out suitable...
Low-mode asymmetries in the laser-indirect-drive inertial confinement fusion implosion experiments conducted on National Ignition Facility [G. H. Miller et al., Nucl. Fusion 44, S228 (2004)] are deemed main obstacles hindering further improvement of nuclear performance deuterium-tritium-layered capsules. The dominant seeds these include P2 and P4 x-ray drives asymmetry introduced by supporting “tent.” Here, we explore effects another possible seed that can lead to low-mode asymmetric...
Abstract To achieve ignition in a laboratory via inertial confinement fusion, spherical capsule containing frozen layer of deuterium and tritium (DT) fuel will be imploded on an MJ-class laser facility. However, if pure can used place DT for tuning shots, we may speed up the process experiments while maintaining surrogacy by significantly reducing level radioactivity. Unfortunately, it has long been assumed that neither approach symmetrical infrared irradiation Omega direct-drive nor method...
The first shaped-pulse inertial confinement fusion implosion experiments of the deuterium-deuterium (DD) gas-filled plastic (CH) capsules have been done at SG-III laser facility [He and Zhang, Eur. Phys. J. D 44, 227 (2007); Zheng et al., Matter Radiat. Extremes 2, 243 (2017)]. measured neutron yield is much lower than that predicted by one-dimensional (1D) simulations, as trough duration drive source increases, over clean decreases rapidly to less 1%. To understand primary reason for this...
With the development of surface precision machining technology and extensive studies on lubrication friction reduction, use texture to reduce has attracted widespread attention, but few have considered influence roughness characteristics. By employing computational fluid dynamics (CFD) simulation method, models with rectangular textures introduction rough asperity structures at same time are established. The effects corresponding structure parameters performance textured roughed surfaces...
Understanding and controlling time-dependent implosion asymmetry are essential requirements to achieve ignition. In a recent symmetry tuning experiment at the 100 kJ laser facility, an effective control was demonstrated by modifying ratio of inner beam power outer power. The hohlraum radiation P2 drive shot used measure backlit shell have been analyzed, sensitivity has illustrated using two-dimensional code LARED. variation in distortion, resulting from due three-dimensional perturbing...
The validity of single-fluid model in inertial confinement fusion simulations is studied by comparing the results multi- and models. multi-fluid includes effects collision interpenetration between fluid species. By simulating species, steady-state shock propagation into thin DT gas expansion hohlraum Au wall heated lasers, show that strongly dependent on ratio characteristic length simulated system to particle mean free path. When L one order larger than path λ, model's are found be good...
The paper investigates theoretically the optimization of doped ablator layers for plastic ignition capsule. high-resolved one-dimensional implosion simulations show that inner pure CH layer Si-doped design is excessively preheated by hard x-ray, leading to unstable ablator-fuel interface compared Ge-doped This because Si K-shell absorption edge (1.8 keV) higher than Ge L-edge (1.3 keV), and dopant makes more x-ray penetrate through preheat layer. So an (called "Si/Ge capsule") performed:...
In this paper, we give a review of three hohlraum geometries, including cylindrical, octahedral and six-cylinder-port hohlraums, in inertial confinement fusion (ICF) mainly from theoretical side. Every has its own strengths weaknesses. Although there is problem drive asymmetry the cylindrical hohlraums due to some non-ideal factors, success ignition still possible if more laser energy available beyond US National Ignition Facility (NIF) future. Octahedral can provide high symmetry flux on...
A novel capsule target design to improve the hot-spot pressure in high-adiabat implosion for inertial confinement fusion is proposed, where a layer of comparatively high-density material used as pusher between fuel and ablator. This based on our theoretical finding stagnation scaling laws, which indicates that hot spot can be improved by increasing kinetic energy density $\rho_d V_{imp}^2/2$ ($\rho_d$ shell when maximum velocity reached, $V_{imp}$ velocity.) shell. The proposed uses high...