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Interface coupling effects of weakly nonlinear Rayleigh–Taylor instability with double interfaces

Chinese physics B 2020年第3期29卷 318-322页

作者： Zhiyuan Li Lifeng Wang Junfeng Wu Wenhua Ye Institute of Applied Physics and Computational Mathematics Beijing 100094China Center for Applied Physics and Technology HEDPSand College of EngineeringPeking UniversityBeijing 100871China

Taking the Rayleigh–Taylor instability with double interfaces as the research object,the interface coupling effects in the weakly nonlinear regime are studied *** variation of Atwood numbers on the two interfaces and the variation of the thickness between them are taken into *** is shown that,when the Atwood number on the lower interface is small,the amplitude of perturbation growth on the lower interface is positively related with the Atwood number on the upper ***,it is negatively related when the Atwood number on the lower interface is *** above phenomenon is quantitatively studied using an analytical formula and the underlying physical mechanism is presented.

关键词： Rayleigh–Taylor instability weakly nonlinear regime numerical simulation

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Vanishing Diffusivity Limit for the Boussinesq Equations with Dirichlet Boundary Conditions

SSRN

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SSRN 2025年

作者： Wang, Peixin Yin, Li Xu, Xiaojing School of Mathematics and Statistics Xidian University Shaanxi Xi’an710071 China School of Mathematical Sciences Beijing Normal University Laboratory of Mathematics and Complex Systems Ministry of Education Beijing100875 China Institute of Applied Physics and Computational Mathematics China

In the model of atmospheric and oceanic fluids, temperature plays an important role, where the Boussinesq equations is one of the most typical models describing such phenomena. This paper focuses on the temperature boundary layer phenomenon of the Boussinesq system in the upper half plane. By studying the vanishing diffusivity limit for the Dirichlet problem of the Boussinesq equations under fixed viscosity, we find the time dependence of temperature on the boundary directly leads to different temperature boundary layer phenomena. Strong temperature boundary layer ($O(\varepsilon^{0})$) occurs when temperature depends on time on the boundary, otherwise only weak temperature boundary layer ($O(\varepsilon^{\gamma}), \gamma>0$) appears. Both strong and weak temperature boundary layers only cause the weak velocity boundary layers. We also establish the convergence results for the solutions of the Boussinesq equations in $L^{\infty}_{t,x}$. © 2025, The Authors. All rights reserved.

关键词： Boundary conditions

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Distributed Multitarget Tracking Using Chernoff Fusion in SMC-CPHD Filtering

Distributed Multitarget Tracking Using Chernoff Fusion in SM...

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2022 Chinese Automation Congress, CAC 2022

作者： Ding, Changwen Zhou, Di Du, Runle Zou, Xinguang Harbin Institute of Technology School of Astronautics Harbin China State Key Laboratory of Experimental Physics and Computational Mathematics Beijing China Harbin Institute of Technology School of Electronics and Engineering Harbin China

ISBN: (纸本)9781665465335

The multisensor random finite set (RFS) based multitarget tracking filters like probability hypothesis density (PHD) filter have been widely developed. Many existing fusion algorithms are restricted to scalability or computational efficiency. In this paper, we develop a distributed sensor fusion algorithm for multitarget tracking using sequential Monte Carlo cardinalized probability hypothesis density (SMC-CPHD) filter with the Chernoff fusion method, which is quite suitable for nonlinear fusion process. We illustrate the CPHD filter at first, then we introduce the Chernoff fusion in log-linear form, which is a generalization of the Covariance Intersection scheme, and we provide a combination and implementation method for the Chernoff fusion and SMC-CPHD filter. The performance of the Chernoff fusion algorithm for SMC-CPHD filter is demonstrated through a simulation of multitarget tracking scenario. The results show that the proposed distributed multitarget tracking algorithm is efficient both in estimation accuracy and computational load. © 2022 IEEE.

关键词： computational efficiency

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Application of Eigenmode Theory to the Analysis of Low-frequency Problems 4

Application of Eigenmode Theory to the Analysis of Low-frequ...

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4th International applied computational Electromagnetics Society Symposium in China, ACES-China 2021

作者： Chen, Xiaojie CAEP Software Center for High Performance Numerical Simulation Institute of Applied Physics and Computational Mathematics Beijing China

ISBN: (纸本)9781733509619

In a previous paper, eigenmode theory was presented for the numerical analysis of electromagnetic radiation and scattering from perfectly electrically conducting (PEC) objects. In this method, the model currents solved from surface differential equations (SDEs) are considered as complete domain basis functions of moment method (MoM). Therefore, it can greatly reduce the computational cost of the analysis of electrically large objects. In this paper, we show that eigenmode theory is also available for the analysis of low-frequency problems. Numerical results demonstrate its effectiveness and accuracy. © 2021 applied computational Electromagnetics Society (ACES).

关键词： Differential equations

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Determination of laser entrance hole size for ignition-scale octahedral spherical hohlraums

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Matter and Radiation at Extremes 2022年第6期7卷 41-49页

作者： Yao-Hua Chen Zhichao Li Hui Cao Kaiqiang Pan Sanwei Li Xufei Xie Bo Deng Qiangqiang Wang Zhurong Cao Lifei Hou Xingsen Che Pin Yang Yingjie Li Xiaoan He Tao Xu Yonggang Liu Yulong Li Xiangming Liu Haijun Zhang Wei Zhang Baibin Jiang Jun Xie Wei Zhou Xiaoxia Huang Wen Yi Huo Guoli Ren Kai Li Xudeng Hang Shu Li Chuanlei Zhai Jie Liu Shiyang Zou Yongkun Ding Ke Lan Institute of Applied Physics and Computational Mathematics Beijing 100094China Research Center of Laser Fusion China Academy of Engineering PhysicsMianyang 621900China Graduate School China Academy of Engineering PhysicsBeijingChina HEDPS Center for Applied Physics and Technologyand College of EngineeringPeking UniversityBeijing 100871China

A recently proposed octahedral spherical hohlraum with six laser entrance holes(LEHs)is an attractive concept for an upgraded laser facility aiming at a predictable and reproducible fusion gain with a simple target ***,with the laser energies available at present,LEH size can be a critical *** to the uncertainties in simulation results,the LEH size should be determined on the basis of experimental ***,determination of LEH size of an ignition target at a small-scale laser facility poses *** this paper,we propose to use the prepulse of an ignition pulse to determine the LEH size for ignition-scale hohlraums via LEH closure behavior,and we present convincing evidence from multiple diagnostics at the SGIII facility with ignition-scale hohlraum,laser prepulse,and laser beam *** LEH closure observed in our experiment is in agreement with data from the National Ignition *** total LEH area of the octahedral hohlraum is found to be very close to that of a cylindrical hohlraum,thus successfully demonstrating the feasibility of the octahedral hohlraum in terms of laser energy,which is crucially important for sizing an ignition-scale octahedrally configured laser *** work provides a novel way to determine the LEH size of an ignition target at a small-scale laser facility,and it can be applied to other hohlraum configurations for the indirect drive approach.

关键词： laser size spherical

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The Cauchy problem for the stochastic generalized Benjamin-Ono equation

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Science China mathematics 2021年第2期64卷 331-350页

作者： Wei Yan Jianhua Huang Boling Guo College of Mathematics and Information Science Henan Normal UniversityXinxiang 453007China College of Liberal Arts and Sciences National University of Defense TechnologyChangsha 410073China Institute of Applied Physics and Computational Mathematics Beijing 100088China

The current paper is devoted to the Cauchy problem for the stochastic generalized Benjamin-Ono *** establishing the bilinear and trilinear estimates in some Bourgain spaces,we prove that the Cauchy problem for the stochastic generalized Benjamin-Ono equation is locally well-posed for the initial data u0(x,w)∈L^(2)(Ω;H^(s)(R))which is F0-measurable with s≥1/2-α/4 andΦ∈L20,*** particular,whenα=1,we prove that it is globally well-posed for the initial data u0(x,w)∈L2(Ω;H1(R))which is F0-measurable andΦ∈L20,*** key ingredients that we use in this paper are trilinear estimates,the Ito formula and the Burkholder-Davis-Gundy(BDG)inequality as well as the stopping time technique.

关键词： Cauchy problem stochastic generalized Benjamin-Ono equation bilinear estimate trilinear estimate

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Complete Characterizations of Intermediate and Final State Wave Functions with Photoionization of Polarized Rb

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Physical Review Letters 2025年第12期134卷 123204-123204页

作者： Huanyu Ma Linxuan Zhang Xincheng Wang Zhihan Zou Rujin Lv Zhenjie Shen Ahai Chen Matthias Weidemüller Kiyoshi Ueda Center for Transformative Science and School of Physical Science and Technology ShanghaiTech University Shanghai 201210 China Shanghai Advanced Research Institute Chinese Academy of Sciences Shanghai 201210 China National Key Laboratory of Computational Physics Institute of Applied Physics and Computational Mathematics Beijing 100088 China Graduate School China Academy of Engineering Physics Beijing 100193 China Physikalisches Institut Universität Heidelberg Im Neuenheimer Feld 226 69120 Heidelberg Germany

The amplitude and phase of a photoionization channel provide deep insights into the nature of ionization dynamics. Here, we propose a novel experimental approach to retrieve these parameters from the photoelectron momentum distribution (PMD), where a 400 nm femtosecond laser is used to ionize polarized Rb atoms prepared in the 5p state. The magnetic quantum numbers of polarized atoms are well controlled by breaking down the symmetry of the cooling laser in a magneto-optical trap reaction microscope. From the tilt angle of the PMD and the interference structure of εs and εd ionization channels, we are able to extract their relative amplitude and phase shift, in good agreement with ab initio calculations. This exhibits a benchmark one-photon single ionization study of the hydrogen-like atom, providing a complete measurement with full characterizations of intermediate and final state wave functions.

关键词： Wave functions

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Polarization conversion in the caviton driven by linearly polarized lasers

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Physical Review E 2022年第2期105卷 L023202-L023202页

作者： S. T. Zhang T. Yang Y. Z. Zhou Y. Jiang R. Xie D. J. Liu X. M. Li B. Qiao Z. J. Liu L. H. Cao C. Y. Zheng X. T. He Center for Applied Physics and Technology HEDPS and State Key Laboratory of Nuclear Physics and Technology School of Physics Peking University Beijing 100871 People's Republic of China Institute of Applied Physics and Computational Mathematics Beijing 100088 People's Republic of China

In one-dimensional particle-in-cell simulations of a plasma irradiated by linearly polarized lasers from both sides of boundaries, it is found that there is an appreciable growth of the electromagnetic field in cavitons in the transverse direction perpendicular to the direction of polarization, which indicates the polarization conversion of the electromagnetic field in cavitons. This paper demonstrates the mechanism of this phenomenon based on parametric resonance induced by ponderomotive force with twice the frequency of the electromagnetic radiation in the caviton. We develop a theoretical model and verify it with simulation results. This phenomenon contributes to the heating and acceleration of particles and traps more EM energy in cavitons.

关键词： High intensity laser-plasma interactions High-energy-density plasmas Plasma instabilities Particle-in-cell methods

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Magnetic-field-induced effect on linear polarization of the 2p53sP23→2p6S01 line in Ne-like ions excited by electron impact

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Physical Review A 2024年第6期110卷 062803-062803页

作者： Ziqiang Tian Zhiming Tang Yi Li Shihan Huang Yang Yang Zhongwen Wu Jiguang Li Wenxian Li Xiaobin Ding Shanghai EBIT Laboratory Key Laboratory of Nuclear Physics and Ion-Beam Application (MOE) Institute of Modern Physics Fudan University Shanghai 200433 People's Republic of China Key Laboratory of Atomic and Molecular Physics and Functional Materials of Gansu Province College of Physics and Electronic Engineering Northwest Normal University Lanzhou 730070 People's Republic of China Institute of Applied Physics and Computational Mathematics Beijing 100088 People's Republic of China National Astronomical Observatories Chinese Academy of Sciences Beijing 100012 People's Republic of China

We study the effect of the magnetic-field-induced transition (MIT) from the magnetic sublevels 2p53sP23, M=0,±1 on linear polarization of the entire 2p53sP23→2p6S01 emission line following the electron-impact excitation of Ne-like ions based on the density-matrix method for describing polarized radiative emission in an external magnetic field. It is found that the MIT has a significant effect on the polarization properties of the line, which is more prominent at stronger magnetic-field strengths and higher impact electron energies. In addition, such an effect is particularly remarkable for light ions due to the fact that the MIT channel dominates in competition with the intrinsic magnetic-quadrupole channel. These findings highlight the potential of polarization measurements for diagnosing magnetic fields in astrophysical and laboratory plasmas.

关键词： Atomic & molecular collisions Atomic & molecular processes in external fields Atomic & molecular structure Atomic spectra Electronic excitation & ionization X-ray generation in plasmas Ions Polarization

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MRCI+Q calculations on electronic structure and spectroscopy of low-lying electronic states of silicon monobromide including spin-orbit coupling effect

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Journal of Quantitative Spectroscopy and Radiative Transfer 2024年 329卷

作者： Li, Rui Gu, Xinyu Lin, Xiaohe Wu, Yong Department of Physics College of Science Qiqihar University Qiqihar161006 China College of Teacher Education Qiqihar University Qiqihar161006 China Faculty of Foundation Space Engineering University Beijing 101416 China National Key Laboratory of Computational Physics Institute of Applied Physics and Computational Mathematics P. O. Box 8009 Beijing 100088 China HEDPS Center for Applied Physics and Technology Peking University Beijing 100084 China School of Physics and Information Technology Shaanxi Normal University Xi'an710119 China

The electronic structures of silicon monobromide (SiBr) correlating with the lowest three dissociation channels are studied using high-level configuration interaction method. The spin-orbit coupling (SOC) effect and core-valence (CV) correlations effect are taken into account to improve the accuracy of electronic structures. Based on the calculated electronic structures of the lowest three dissociation channels of SiBr, the spectroscopic constants of quasibound and bound electronic states are fitted, which are coincided with the results of experiment. The dipole moment curves (DMs) of the lowest three dissociation channels of SiBr are obtained, and the abrupt change of DMs nearby the avoided crossing point are explained by the variation of electronic configurations of the corresponding states. With the help of the calculated SOC matrix elements, the predissociation channels of the low-lying vibrational states of 2Δ(Ⅱ) and 2Π(Ⅲ) sates are analyzed. The complicated interaction between crossing states is investigated. The ν'≥0 vibrational states of 2Δ(Ⅱ) and ν′≥2 vibrational states of 2Π(Ⅲ) would predissociate rapidly through predissociation channels of 2Δ(Ⅱ)-2Π(Ⅱ) and 2Π(Ⅲ)-2Σ+(Ⅱ). Finally, the transition properties of A2Σ+-X2Π, 2∆(Ⅱ)-X2Π, 2Σ+(Ⅱ)-X2Π, 2Π(Ⅲ)-X2Π, 1/2(Ⅱ)-X2Π1/2, 1/2(Ⅲ)-X2Π1/2 and 3/2(Ⅱ)-X2Π1/2 transitions are investigated, and radiative lifetime of bound states are evaluated. © 2024 Elsevier Ltd

关键词： Spin orbit coupling

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