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48th European Physical Society Conference on Plasma physics, EPS 2022

作者： Liu, Z.Y. Qiao, B. Center for Applied Physics and Technology HEDPS State Key Laboratory of Nuclear Physics and Technology School of Physics Peking University Beijing100871 China

In astrophysics, nuclear reactions take place mostly in the plasma environment, such as the primordial universe, stars and interstellar mediums. However, so far, most of our knowledge of nuclear reactions are from the experiments on conventional particle accelerators, with no plasma effects taken into account. With the rapid progresses of high-power laser facilities, laser-plasma has been regarded as a unique platform for researching nuclear reactions in plasmas. Some colliding laser-produced plasmas experiments have been performed on different laser facilities, and give us strong hints that nuclear reactions in plasmas can be modulated significantly by the self-generated electromagnetic fields and the collective motion of plasma. However, no self-consistent theory or simulation has been given to explain how the kinetic effects influence the nuclear reactions in plasmas. With the implement of nuclear reactions module in particle-in-cell code, we systematically show that, the kinetic Weibel instability occurring in colliding plasma results in significant enhancement of nuclear reactions. Specifically, the self-generated magnetic fields deflect ion motions to different angles, decreasing the relative velocity and converting plasma kinetic energy to thermal energy. For reactions with sharp resonance peak in the cross-section, like (Equation presented) the enhancement of reaction yield could reach up to several times even orders of magnitudes, which is a meaningful result and deserves more attention and further research. © 2022 48th EPS Conference on Plasma physics, EPS 2022. All rights reserved.

关键词： Kinetics

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Minimum model for the main feature of shock Hugoniot near its maximum compression ratio

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Physical Review B 2023年第3期107卷 035102-035102页

作者： Jingxiang Shen Wei Kang HEDPS Center for Applied Physics and Technology College of Engineering Peking University Beijing 100871 China

When being compressed by a single shock, most materials show a maximum compression ratio beyond the ideal-gas limit of four. In most cases, this phenomenon has long been conjectured to originate from the ionization of core electrons, but a clear physical picture is still lacking. Here we present a simple illustration from the energy-band picture of dense plasmas, where the total energy includes only the contributions from ionization of the bound electrons in addition to those from ideal-gas-like free particles. This additional energy term (ionization energy) directly leads to an additional term in the compression ratio η, which gives a peak on the Hugoniot adiabat. Furthermore, peaks given by different bound states are shown to add linearly (η≈4+∑iΔηi), yielding multipeaked Hugoniots. Quantitative predictions regarding those Hugoniot peaks can be provided systematically by using this minimum model, showing a good agreement with first-principles calculations and experimental data.

关键词： Equations of state Hot dense plasma Band structure methods

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Electron-proton relaxation in hot-dense plasmas with a screened quantum statistical potential

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Physical Review E 2024年第2期110卷 025202-025202页

作者： Zhengfeng Fan Chengxin Yu Cong-Zhang Gao Xuefeng Xu Cunbo Zhang Binbing Wu Jie Liu Pei Wang Shaoping Zhu Beijing 100088 China HEDPS Center for Applied Physics and Technology and College of Engineering Graduate School of China Academy of Engineering Physics Beijing 100193 China

Modeling the nonequilibrium process between ions and electrons is of great importance in laboratory fusion ignition, laser-plasma interaction, and astrophysics. For hot and dense plasmas, theoretical descriptions of Coulomb collisions remain complicated due to quantum effect at short distances and screening effect at long distances. In this paper, we propose an analytical screened quantum statistical potential that takes into account both the short-range quantum diffraction effect and the long-range screening effect. By implementing the newly developed potential into the binary scattering framework, the electron-proton temperature relaxation in hot-dense hydrogen plasmas is investigated. In both the classical and quantum limits, analytical expressions for the Coulomb logarithm have been obtained, which are generally embedded in an asymptotic matching formula. Quantitative comparisons with molecular dynamics simulations and recent OMEGA experiments demonstrate that the present modeling is well suited to describe the temperature relaxation process between electrons and ions in hot-dense plasmas.

关键词： High-energy-density plasmas Plasma thermodynamics Hot dense plasma Molecular dynamics

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Thermorelaxing multicomponent flows investigated with a Baer-Nunziato-type model

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Physical Review E 2023年第4期108卷 045108-045108页

作者： Chao Zhang Lifeng Wang Institute of Applied Physics and Computational Mathematics Beijing 100094 China Center for Applied Physics and Technology HEDPS Peking University Beijing 100871 China

In inertial confinement fusion (ICF) implosions, mixing the ablator into the fuel and the hot spot is one of the most adverse factors that lead to ignition degradation. Recent experiments in the Marble campaign at the Omega laser facility and the National Ignition Facility demonstrate the significance of the temperature separation in heterogeneous mixing flows [Haines et al., Nat. Commun. 11, 544 (2020)]. In the present work we provide an approach to deal with thermally disequilibrium multicomponent flows with the ultimate aim to investigate the temperature separation impact on mixing and fusion burn. The present work is twofold: (a) We derive a model governing the multicomponent flows in thermal disequilibrium with transport terms and (b) we use the derived model to study the Rayleigh-Taylor (RT) instability in thermally relaxing multicomponent systems. The model is reduced from the full disequilibrium multiphase Baer-Nunziato model in the limit of small Knudsen number Kn≪1. Velocity disequilibrium is closed with the diffusion laws and only one mass-weighted velocity is retained formally. Thus, the complex wave structure of the original Baer-Nunziato model is simplified to a large extent and the obtained model is much more computationally affordable. Moreover, the capability to deal with finite-temperature relaxation is kept. Efficient numerical methods for solving the proposed model are also presented. Equipped with the proposed model and numerical methods, we further investigate the impact of thermal relaxation on the RT instability development at the ICF deceleration stage. On the basis of numerical simulations, we have found that for the RT instability at an interface between the high-density low-temperature component and the low-density high-temperature component, the thermal relaxation significantly suppresses the development of the instability.

关键词： Flow instability Multiphase flows

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CBETor:a hybrid-kinetic particle-in-cell code for cross-beam energy transfer simulation

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Plasma Science and technology 2022年第10期24卷 37-44页

作者： Jinlong JIAO Hezi WANG Hongyu ZHOU Yan YIN Bin QIAO Hongbin ZHUO Department of Physics National University of Defense TechnologyChangsha 410073People's Republic of China Zhejiang Institution of Modern Physics Department of PhysicsZhejiang UniversityHangzhou 310027People's Republic of China Center for Applied Physics and Technology HEDPSSKLNPTand School of PhysicsPeking UniversityBeijing 100871People's Republic of China Center for Advanced Material Diagnostic Technology Shenzhen Technology UniversityShenzhen 518118People's Republic of China

The parametric instability related to ion motion and the resulting cross-beam energy transfer are important aspects in the physics of inertial confinement *** numerical simulation of the above physical problems still faces great technical *** paper introduces a 2D hybrid-kinetic particle-in-cell(PIC)code,*** this code,the motion of ions is described by the kinetic method,the motion of electrons is described by the simplified fluid method and the propagation of laser in plasma is described by solving the wave *** use CBETor and the popular fully kinetic PIC code EPOCH to simulate the stimulated Brillouin scattering and cross-beam energy transfer process,*** physical images are in good agreement,but CBETor can significantly reduce the amount of *** the premise of correctly simulating the ion dynamics,our hybrid-kinetic code can effectively suppress the noise of numerical simulation and significantly expand the simulation scale of physical *** is very suitable for simulating the physical process dominated by ion motion in the interaction of medium intensity laser and underdense plasma.

关键词： cross-beam energy transfer hybrid-PIC simulation stimulated Brillouin scattering

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The effects of incident light wavelength difference on the collective stimulated Brillouin scattering in plasmas

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Matter and Radiation at Extremes 2023年第5期8卷 42-49页

作者： Qiang Wang Zhichao Li Zhanjun Liu Tao Gong Wenshuai Zhang Tao Xu Bin Li Ping Li Xin Li Chunyang Zheng Lihua Cao Xincheng Liu Kaiqiang Pan Hang Zhao Yonggang Liu Bo Deng Lifei Hou Yingjie Li Xiangming Liu Yulong Li Xiaoshi Peng Zanyang Guan Qiangqiang Wang Xingsen Che Sanwei Li Qiang Yin Wei Zhang Liqiong Xia Peng Wang Xiaohua Jiang Liang Guo Qi Li Minqing He Liang Hao Hongbo Cai Wudi Zheng Shiyang Zou Dong Yang Feng Wang Jiamin Yang Baohan Zhang Yongkun Ding Xiantu He Institute of Applied Physics and Computational Mathematics Beijing 100094China Laser Fusion Research Center China Academy of Engineering PhysicsMianyangSichuan 621900China HEDPS Center for Applied Physics and Technologyand College of EngineeringPeking UniversityBeijing 100871China

The first laser–plasma interaction experiment using lasers of eight beams grouped into one octad has been conducted on the Shenguang Octopus *** each beam intensity is below its individual threshold for stimulated Brillouin backscattering(SBS),collective behaviors are excited to enhance the octad *** particular,when two-color/cone lasers with wavelength separation 0.3 nm are used,the backward SBS reflectivities show novel behavior in which beams of longer wavelength achieve higher SBS *** property of SBS can be attributed to the rotation of the wave vectors of common ion acoustic waves due to the competition of detunings between geometrical angle and wavelength *** mechanism is confirmed using massively parallel supercomputer simulations with the three-dimensional laser–plasma interaction code LAP3D.

关键词： scattering tuning collective

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Equation of state for boron nitride along the principal Hugoniot to 16 Mbar

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Matter and Radiation at Extremes 2024年第5期9卷 77-86页

作者： Huan Zhang Yutong Yang Weimin Yang Zanyang Guan Xiaoxi Duan Mengsheng Yang Yonggang Liu Jingxiang Shen Katarzyna Batani Diluka Singappuli Ke Lan Yongsheng Li Wenyi Huo Hao Liu Yulong Li Dong Yang Sanwei Li Zhebin Wang Jiamin Yang Zongqing Zhao Weiyan Zhang Liang Sun Wei Kang Dimitri Batani National Key Laboratory of Plasma Physics Laser Fusion Research CenterChina Academy of Engineering PhysicsMianyang 621900China HEDPS Center for Applied Physics and Technologyand College of PhysicsPeking UniversityBeijing 100871China HEDPS Center for Applied Physics and Technologyand School of EngineeringPeking UniversityBeijing 100871China Institute of Plasma Physics and Laser Microfusion Hery 2301-497 WarszawaPoland Universitéde Bordeaux CNRSCEACELIA(Centre Lasers Intenses et Applications)UMR 5107F-33405 TalenceFrance Institute of Applied Physics and Computational Mathematics Beijing 100094China

The thermodynamic properties of boron nitride under extreme pressures and temperatures are of great interest and importance for materials science and inertial confinement fusion physics,but they are poorly understood owing to the challenges of performing experiments and realizing ab initio ***,we report the first shock Hugoniot data on hexagonal boron nitride at pressures of 5–16 Mbar,using hohlraum-driven shock waves at the SGIII-p laser facility in *** density functional theory molecular dynamics calculations closely match experimental data,validating the equations of state for modeling the shock response of boron nitride and filling a crucial gap in the knowledge of boron nitride properties in the region of multi-Mbar pressures and eV *** results presented here provide fundamental insights into boron nitride under the extreme conditions relevant to inertial confinement fusion,hydrogen–boron fusion,and high-energy-density physics.

关键词： boron Hugoniot extreme

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Extremum-Preserving Correction of the Nine-Point Scheme for Diffusion Equation on Distorted Meshes

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Advances in applied Mathematics and Mechanics 2023年第2期15卷 402-427页

作者： Wang Kong Zhenying Hong Guangwei Yuan Zhiqiang Sheng Department of Mathematics Nanjing University of Aeronautics and AstronauticsNanjingJiangsu 211106China Key Laboratory of Mathematical Modelling and High Performance Computing of Air Vehicles(NUAA) MIITNanjingJiangsu 211106China Laboratory of Computational Physics Institute of Applied Physics and Computational MathematicsBeijing 100088China HEDPS Center for Applied Physics and TechnologyPeking UniversityBeijing 100871China

In this paper,we construct a new cell-centered nonlinear finite volume scheme that preserves the extremum principle for heterogeneous anisotropic diffusion equation on distorted *** introduce a new nonlinear approach to construct the conservative flux,that is,a linear second order flux is firstly given and a nonlinear conservative flux is then constructed by using an adaptive method and a nonlinear weighted *** new scheme does not need to use the convex combination of the cell-center unknowns to approximate the auxiliary unknowns,so it can deal with the problem with general discontinuous *** results show that our new scheme performs more robust than some existing schemes on highly distorted meshes.

关键词： Extremum-preserving correction diffusion equation distorted mesh nine-point scheme

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Advances in the kinetics of heat and mass transfer in near-continuous complex flows

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Frontiers of physics 2024年第4期19卷 187-234页

作者：许爱国张德佳甘延标 National Key Laboratory of Computational Physics Institute of Applied Physics and Computational MathematicsP.O.Box 8009-26Beijing 100088China State Key Laboratory of Explosion Science and Technology Beijing Institute of TechnologyBeijing 100081China HEDPS Center for Applied Physics and Technologyand College of EngineeringPeking UniversityBeijing 100871China State Key Laboratory for GeoMechanics and Deep Underground Engineering China University of Mining and TechnologyBeijing 100083China National Key Laboratory of Shock Wave and Detonation Physics Mianyang 621999China Hebei Key Laboratory of Trans-Media Aerial Underwater Vehicle School of Liberal Arts and SciencesNorth China Institute of Aerospace EngineeringLangfang 065000China

The study of macro continuous flow has a long ***,the exploration of heat and mass transfer in small systems with a particle number of several hundred or less has gained significant interest in the fields of statistical physics and nonlinear ***,due to absence of suitable methods,the understanding of mesoscale behavior situated between the aforementioned two scenarios,which challenges the physical function of traditional continuous fluid theory and exceeds the simulation capability of microscopic molecular dynamics method,remains considerably *** greatly restricts the evaluation of effects of mesoscale behavior and impedes the development of corresponding regulation *** access the mesoscale behaviors,there are two ways:from large to small and from small to *** the necessity to interface with the prevailing macroscopic continuous modeling currently used in the mechanical engineering community,our study of mesoscale behavior begins from the side closer to the macroscopic continuum,that is from large to *** on some fundamental challenges encountered in modeling and analysis of near-continuous flows,we review the research progress of discrete Boltzmann method(DBM).The ideas and schemes of DBM in coarse-grained modeling and complex physical field analysis are *** relationships,particularly the differences,between DBM and traditional fluid modeling as well as other kinetic methods are *** verification and validation of the method,some applied researches including the development of various physical functions associated with discrete and non-equilibrium effects are *** directions of DBM related studies are indicated.

关键词： near-continuous flow non-equilibrium kinetics discrete Boltzmann method complex physical field analysis

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Dream fusion in octahedral spherical hohlraum

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Matter and Radiation at Extremes 2022年第5期7卷 29-38页

作者： Ke Lan Institute of Applied Physics and Computational Mathematics Beijing 100094China HEDPS Center for Applied Physics and Technologyand College of EngineeringPeking UniversityBeijing 100871China

The octahedral spherical hohlraum provides an ideal and practical approach for indirect-drive toward a dream fusion with predictable andreproducible gain and opens a route to the development of a laser drive system for multiple laser fusion schemes. This paper addressesa number of issues that have arisen with regard to octahedral spherical hohlraums, such as how to naturally generate a highly symmetricradiation drive at all times and for all spectra without the use of symmetry tuning technology, how to determine the three-dimensional,temporal, and spectral characteristics of the real radiation drive on a capsule in experiments, and the relative energy efficiency of an octahedralspherical hohlraum compared with a cylindrical hohlraum. A design island for an octahedral spherical hohlraum is presented. Finally, thechallenges and future tasks for the path forward are presented.

关键词： spherical island cylindrical

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