Matter and Radiation at Extremes最新文献_第2页

Ab initio density response and local field factor of warm dense hydrogen 暖致密氢的 Ab initio 密度响应和局部场因子

IF 5.1 1区物理与天体物理

Matter and Radiation at Extremes Pub Date : 2024-07-26 DOI: 10.1063/5.0211407

Tobias Dornheim, Sebastian Schwalbe, Panagiotis Tolias, Maximilian P. Böhme, Zhandos A. Moldabekov, Jan Vorberger

{"title":"Ab initio density response and local field factor of warm dense hydrogen","authors":"Tobias Dornheim, Sebastian Schwalbe, Panagiotis Tolias, Maximilian P. Böhme, Zhandos A. Moldabekov, Jan Vorberger","doi":"10.1063/5.0211407","DOIUrl":"https://doi.org/10.1063/5.0211407","url":null,"abstract":"We present quasi-exact ab initio path integral Monte Carlo (PIMC) results for the partial static density responses and local field factors of hydrogen in the warm dense matter regime, from solid density conditions to the strongly compressed case. The full dynamic treatment of electrons and protons on the same footing allows us to rigorously quantify both electronic and ionic exchange–correlation effects in the system, and to compare the results with those of earlier incomplete models such as the archetypal uniform electron gas or electrons in a fixed ion snapshot potential that do not take into account the interplay between the two constituents. The full electronic density response is highly sensitive to electronic localization around the ions, and our results constitute unambiguous predictions for upcoming X-ray Thomson scattering experiments with hydrogen jets and fusion plasmas. All PIMC results are made freely available and can be used directly for a gamut of applications, including inertial confinement fusion calculations and the modeling of dense astrophysical objects. Moreover, they constitute invaluable benchmark data for approximate but computationally less demanding approaches such as density functional theory or PIMC within the fixed-node approximation.","PeriodicalId":54221,"journal":{"name":"Matter and Radiation at Extremes","volume":"94 1","pages":""},"PeriodicalIF":5.1,"publicationDate":"2024-07-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141779515","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Direct visualization of laser-driven dynamic fragmentation in tin by in situ x-ray diffraction 通过原位 X 射线衍射直接观察锡中激光驱动的动态碎裂情况

IF 5.1 1区物理与天体物理

Matter and Radiation at Extremes Pub Date : 2024-07-25 DOI: 10.1063/5.0200242

Jing Yang, Xinxin Wang, Liang Xu, Qiannan Wang, Yi Sun, Jiangtao Li, Lin Zhang, Yinghua Li, Yuying Yu, Pei Wang, Qiang Wu, Jianbo Hu

引用次数: 0

Bunching enhancement for coherent harmonic generation by using phase merging effects 利用相位合并效应增强相干谐波生成的捆绑功能

IF 5.1 1区物理与天体物理

Matter and Radiation at Extremes Pub Date : 2024-07-08 DOI: 10.1063/5.0191508

Ke Feng, Kangnan Jiang, Runshu Hu, Shixia Luan, Wentao Wang, Ruxin Li

{"title":"Bunching enhancement for coherent harmonic generation by using phase merging effects","authors":"Ke Feng, Kangnan Jiang, Runshu Hu, Shixia Luan, Wentao Wang, Ruxin Li","doi":"10.1063/5.0191508","DOIUrl":"https://doi.org/10.1063/5.0191508","url":null,"abstract":"In this paper, promising but simple schemes are investigated to enhance the micro-bunching of relativistic electron beams for coherent harmonic generation (CHG) by using phase merging effects. In contrast to the standard CHG scheme, two specially designed dispersion sections (DSs) are adopted with the DS-modulator–DS configuration. The phase space of the e beam is appropriately coupled in the first DS, and the electrons within one seed wavelength can merge to the same phase with a matched second DS. Micro-bunching of the e beam can thus be enhanced by a large margin with much higher-harmonic components. Taking e beams from laser wakefield accelerators (LWFAs) as an example, start-to-end simulations are performed to show the effectiveness and robustness of the proposed schemes with several configurations. The beam current can be optimized to several tens to hundreds of kiloamperes, and the radiation power reaches hundreds of megawatts in the extreme ultraviolet regime within a 3.5 m-long beamline. The proposed schemes offer new opportunities for future compact free-electron lasers driven by LWFAs and provides prospects for truly compact and widely applicable systems.","PeriodicalId":54221,"journal":{"name":"Matter and Radiation at Extremes","volume":"14 1","pages":""},"PeriodicalIF":5.1,"publicationDate":"2024-07-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141570498","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Compact ultrafast neutron sources via bulk acceleration of deuteron ions in an optical trap 通过在光学陷阱中对氘核离子进行体加速实现紧凑型超快中子源

IF 5.1 1区物理与天体物理

Matter and Radiation at Extremes Pub Date : 2024-07-08 DOI: 10.1063/5.0208901

Zhiyu Lei, Hanghang Ma, Xiaobo Zhang, Lin Yu, Yihang Zhang, Yutong Li, Suming Weng, Min Chen, Jie Zhang, Zhengming Sheng

{"title":"Compact ultrafast neutron sources via bulk acceleration of deuteron ions in an optical trap","authors":"Zhiyu Lei, Hanghang Ma, Xiaobo Zhang, Lin Yu, Yihang Zhang, Yutong Li, Suming Weng, Min Chen, Jie Zhang, Zhengming Sheng","doi":"10.1063/5.0208901","DOIUrl":"https://doi.org/10.1063/5.0208901","url":null,"abstract":"A scheme for a quasi-monoenergetic high-flux neutron source with femtosecond duration and highly anisotropic angular distribution is proposed. This scheme is based on bulk acceleration of deuteron ions in an optical trap or density grating formed by two counter-propagating laser pulses at an intensity of ∼1016W/cm2 in a near-critical-density plasma. The deuterons are first pre-accelerated to an energy of tens of keV in the ambipolar fields formed in the optical trap. Their energy is boosted to the MeV level by another one or two laser pulses at an intensity of ∼1020W/cm2, enabling fusion reactions to be triggered with high efficiency. In contrast to previously proposed pitcher–catcher configurations, our scheme can provide spatially periodic acceleration structures and effective collisions between deuterons inside the whole target volume. Subsequently, neutrons are generated directly inside the optical trap. Our simulations show that neutron pulses with energy 2–8 MeV, yield 1018–1019n/s, and total number 106–107 in a duration ∼400 fs can be obtained with a 25 μm target. Moreover, the neutron pulses exhibit unique angularly dependent energy spectra and flux distributions, predominantly along the axis of the energy-boosting lasers. Such microsize femtosecond neutron pulses may find many applications, such as high-resolution fast neutron imaging and nuclear physics research.","PeriodicalId":54221,"journal":{"name":"Matter and Radiation at Extremes","volume":"21 1","pages":""},"PeriodicalIF":5.1,"publicationDate":"2024-07-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141570499","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Mechanical responses and crystal plasticity model of CoCrNi medium-entropy alloy under ramp wave compression 斜波压缩下 CoCrNi 中熵合金的力学响应和晶体塑性模型

IF 5.1 1区物理与天体物理

Matter and Radiation at Extremes Pub Date : 2024-06-21 DOI: 10.1063/5.0206773

Jinlei Dong, Xuping Zhang, Guiji Wang, Xianqian Wu, Binqiang Luo, Xuemiao Chen, Fuli Tan, Jianheng Zhao, Chengwei Sun

{"title":"Mechanical responses and crystal plasticity model of CoCrNi medium-entropy alloy under ramp wave compression","authors":"Jinlei Dong, Xuping Zhang, Guiji Wang, Xianqian Wu, Binqiang Luo, Xuemiao Chen, Fuli Tan, Jianheng Zhao, Chengwei Sun","doi":"10.1063/5.0206773","DOIUrl":"https://doi.org/10.1063/5.0206773","url":null,"abstract":"It is of substantial scientific significance and practical value to reveal and understand the multiscale mechanical properties and intrinsic mechanisms of medium-entropy alloys (MEAs) under high strain rates and pressures. In this study, the mechanical responses and deformation mechanisms of an equiatomic CoCrNi MEA are investigated utilizing magnetically driven ramp wave compression (RWC) with a strain rate of 105 s−1. The CoCrNi MEA demonstrates excellent dynamic mechanical responses and yield strength under RWC compared with other advanced materials. Multiscale characterizations reveal that grain refinement and abundant micromechanisms, including dislocation slip, stacking faults, nanotwin network, and Lomer–Cottrell locks, collectively contribute to its excellent performance during RWC. Furthermore, dense deformation twins and shear bands intersect, forming a weave-like microstructure that can disperse deformation and enhance plasticity. On the basis of these observations, we develop a modified crystal plasticity model with coupled dislocation and twinning mechanisms, providing a relatively accurate quantitative description of the multiscale behavior under RWC. The results of simulations indicate that the activation of multilevel microstructures in CoCrNi MEA is primarily attributable to stress inhomogeneities and localized strain during RWC. Our research offers valuable insights into the dynamic mechanical responses of CoCrNi MEA, positioning it as a promising material for use under extreme dynamic conditions.","PeriodicalId":54221,"journal":{"name":"Matter and Radiation at Extremes","volume":"198 1","pages":""},"PeriodicalIF":5.1,"publicationDate":"2024-06-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141509764","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Driver at 10 MJ and 1 shot/30 min for inertial confinement fusion at high gain: Efficient, compact, low-cost, low laser–plasma instabilities, beam color selectable from 2ω/3ω/4ω, applicable to multiple laser fusion schemes 驱动器功率为 10 兆焦耳，1 次/30 分钟，用于高增益惯性约束聚变：高效、紧凑、低成本、低激光等离子体不稳定性、光束颜色可从 2ω/3ω/4ω 中选择、适用于多种激光聚变方案

IF 5.1 1区物理与天体物理

Matter and Radiation at Extremes Pub Date : 2024-06-20 DOI: 10.1063/5.0216435

Zhan Sui, Ke Lan

引用次数: 0

Demonstrating grating-based phase-contrast imaging of laser-driven shock waves 基于光栅的激光驱动冲击波相位对比成像演示

IF 5.1 1区物理与天体物理

Matter and Radiation at Extremes Pub Date : 2024-06-20 DOI: 10.1063/5.0200440

Leonard Wegert, Stephan Schreiner, Constantin Rauch, Bruno Albertazzi, Paulina Bleuel, Eric Fröjdh, Michel Koenig, Veronika Ludwig, Artem S. Martynenko, Pascal Meyer, Aldo Mozzanica, Michael Müller, Paul Neumayer, Markus Schneider, Angelos Triantafyllidis, Bernhard Zielbauer, Gisela Anton, Thilo Michel, Stefan Funk

引用次数: 0

Electron kinetic effects in back-stimulated Raman scattering bursts driven by broadband laser pulses 宽带激光脉冲驱动的反向激励拉曼散射脉冲串中的电子动力学效应

IF 5.1 1区物理与天体物理

Matter and Radiation at Extremes Pub Date : 2024-05-13 DOI: 10.1063/5.0189529

Q. K. Liu, L. Deng, Q. Wang, X. Zhang, F. Q. Meng, Y. P. Wang, Y. Q. Gao, H. B. Cai, S. P. Zhu

{"title":"Electron kinetic effects in back-stimulated Raman scattering bursts driven by broadband laser pulses","authors":"Q. K. Liu, L. Deng, Q. Wang, X. Zhang, F. Q. Meng, Y. P. Wang, Y. Q. Gao, H. B. Cai, S. P. Zhu","doi":"10.1063/5.0189529","DOIUrl":"https://doi.org/10.1063/5.0189529","url":null,"abstract":"We examine electron kinetic effects in broadband-laser-driven back-stimulated Raman scattering (BSRS) bursts using particle-in-cell simulations. These bursts occur during the nonlinear stage, causing reflectivity spikes and generating large numbers of hot electrons. Long-duration simulations are performed to observe burst events, and a simplified model is developed to eliminate the interference of the broadband laser’s random intensity fluctuations. Using the simplified model, we isolate and characterize the spectrum of electron plasma waves. The spectrum changes from a sideband structure to a turbulence-like structure during the burst. A significant asymmetry in the spectrum is observed. This asymmetry is amplified and transferred to electron phase space by high-intensity broadband laser pulses, leading to violent vortex-merging and generation of hot electrons. The proportion of hot electrons increases from 6.76% to 14.7% during a single violent burst event. We demonstrate that kinetic effects profoundly influence the BSRS evolution driven by broadband lasers.","PeriodicalId":54221,"journal":{"name":"Matter and Radiation at Extremes","volume":"87 1","pages":""},"PeriodicalIF":5.1,"publicationDate":"2024-05-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140927080","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A novel method for determining the resistivity of compressed superconducting materials 测定压缩超导材料电阻率的新方法

IF 5.1 1区物理与天体物理

Matter and Radiation at Extremes Pub Date : 2024-05-08 DOI: 10.1063/5.0206375

Liling Sun, Qi Wu, Shu Cai, Yang Ding, Ho-kwang Mao

引用次数: 0

Efficient guiding and focusing of intense laser pulse using periodic thin slits 利用周期性细缝高效引导和聚焦强激光脉冲

IF 5.1 1区物理与天体物理

Matter and Radiation at Extremes Pub Date : 2024-05-07 DOI: 10.1063/5.0192396

L. Xu, T. W. Huang, K. Jiang, C. N. Wu, H. Peng, P. Chen, R. Li, H. B. Zhuo, C. T. Zhou

引用次数: 0