Matter and Radiation at Extremes最新文献_第7页

Transition from backward to sideward stimulated Raman scattering with broadband lasers in plasmas 等离子体中宽带激光从向后到侧向受激拉曼散射的转变

1区物理与天体物理

Matter and Radiation at Extremes Pub Date : 2023-09-13 DOI: 10.1063/5.0152668

X. F. Li, S. M. Weng, P. Gibbon, H. H. Ma, S. H. Yew, Z. Liu, Y. Zhao, M. Chen, Z. M. Sheng, J. Zhang

{"title":"Transition from backward to sideward stimulated Raman scattering with broadband lasers in plasmas","authors":"X. F. Li, S. M. Weng, P. Gibbon, H. H. Ma, S. H. Yew, Z. Liu, Y. Zhao, M. Chen, Z. M. Sheng, J. Zhang","doi":"10.1063/5.0152668","DOIUrl":"https://doi.org/10.1063/5.0152668","url":null,"abstract":"Broadband lasers have been proposed as future drivers of inertial confined fusion (ICF) to enhance the laser–target coupling efficiency via the mitigation of various parametric instabilities. The physical mechanisms involved have been explored recently, but are not yet fully understood. Here, stimulated Raman scattering (SRS) as one of the key parametric instabilities is investigated theoretically and numerically for a broadband laser propagating in homogeneous plasma in multidimensional geometry. The linear SRS growth rate is derived as a function of scattering angles for two monochromatic laser beams with a fixed frequency difference δω. If δω/ω0 ∼ 1%, with ω0 the laser frequency, these two laser beams may be decoupled in stimulating backward SRS while remaining coupled for sideward SRS at the laser intensities typical for ICF. Consequently, side-scattering may dominate over backward SRS for two-color laser light. This finding of SRS transition from backward to sideward SRS is then generalized for a broadband laser with a few-percent bandwidth. Particle-in-cell simulations demonstrate that with increasing laser bandwidth, the sideward SRS gradually becomes dominant over the backward SRS. Since sideward SRS is very efficient in producing harmful hot electrons, attention needs to be paid on this effect if ultra-broadband lasers are considered as next-generation ICF drivers.","PeriodicalId":54221,"journal":{"name":"Matter and Radiation at Extremes","volume":"36 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135733687","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

Simulations of spin/polarization-resolved laser–plasma interactions in the nonlinear QED regime 非线性QED中自旋/偏振分辨激光-等离子体相互作用的模拟

1区物理与天体物理

Matter and Radiation at Extremes Pub Date : 2023-09-13 DOI: 10.1063/5.0163929

Feng Wan, Chong Lv, Kun Xue, Zhen-Ke Dou, Qian Zhao, Mamutjan Ababekri, Wen-Qing Wei, Zhong-Peng Li, Yong-Tao Zhao, Jian-Xing Li

引用次数: 3

Characterization of hot electrons generated by laser–plasma interaction at shock ignition intensities 激波点火强度下激光等离子体相互作用产生的热电子的表征

1区物理与天体物理

Matter and Radiation at Extremes Pub Date : 2023-09-13 DOI: 10.1063/5.0157168

E. D. Filippov, M. Khan, A. Tentori, P. Gajdos, A. S. Martynenko, R. Dudzak, P. Koester, G. Zeraouli, D. Mancelli, F. Baffigi, L. A. Gizzi, S. A. Pikuz, Ph.D. Nicolaï, N. C. Woolsey, R. Fedosejevs, M. Krus, L. Juha, D. Batani, O. Renner, G. Cristoforetti

{"title":"Characterization of hot electrons generated by laser–plasma interaction at shock ignition intensities","authors":"E. D. Filippov, M. Khan, A. Tentori, P. Gajdos, A. S. Martynenko, R. Dudzak, P. Koester, G. Zeraouli, D. Mancelli, F. Baffigi, L. A. Gizzi, S. A. Pikuz, Ph.D. Nicolaï, N. C. Woolsey, R. Fedosejevs, M. Krus, L. Juha, D. Batani, O. Renner, G. Cristoforetti","doi":"10.1063/5.0157168","DOIUrl":"https://doi.org/10.1063/5.0157168","url":null,"abstract":"In an experiment carried out at the Prague Asterix Laser System at laser intensities relevant to shock ignition conditions (I &gt; 1016 W/cm2), the heating and transport of hot electrons were studied by using several complementary diagnostics, i.e., Kα time-resolved imaging, hard x-ray filtering (a bremsstrahlung cannon), and electron spectroscopy. Ablators with differing composition from low Z (parylene N) to high Z (nickel) were used in multilayer planar targets to produce plasmas with different coronal temperature and collisionality and modify the conditions of hot-electron generation. The variety of available diagnostics allowed full characterization of the population of hot electrons, retrieving their conversion efficiency, time generation and duration, temperature, and angular divergence. The obtained results are shown to be consistent with those from detailed simulations and similar inertial confinement fusion experiments. Based on the measured data, the advantages, reliability, and complementarity of the experimental diagnostics are discussed.","PeriodicalId":54221,"journal":{"name":"Matter and Radiation at Extremes","volume":"38 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135734617","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: 1

A fresh class of superconducting and hard pentaborides 一类新的超导硬五硼化物

IF 5.1 1区物理与天体物理

Matter and Radiation at Extremes Pub Date : 2023-09-01 DOI: 10.1063/5.0157250

Hui Xie, Hong Wang, Fang Qin, Wei Han, Suxin Wang, Youchun Wang, F. Tian, D. Duan

{"title":"A fresh class of superconducting and hard pentaborides","authors":"Hui Xie, Hong Wang, Fang Qin, Wei Han, Suxin Wang, Youchun Wang, F. Tian, D. Duan","doi":"10.1063/5.0157250","DOIUrl":"https://doi.org/10.1063/5.0157250","url":null,"abstract":"On the basis of the current theoretical understanding of boron-based hard superconductors under ambient conditions, numerous studies have been conducted with the aim of developing superconducting materials with favorable mechanical properties using boron-rich compounds. In this paper, first-principles calculations reveal the existence of an unprecedented family of tetragonal pentaborides MB5 (M = Na, K, Rb, Ca, Sr, Ba, Sc, and Y), comprising B20 cages and centered metal atoms acting as stabilizers and electron donors to the boron sublattice. These compounds exhibit both superconductivity and high hardness, with the maximum superconducting transition temperature Tc of 18.6 K being achieved in RbB5 and the peak Vickers hardness Hv of 35.1 GPa being achieved in KB5 at 1 atm. The combination of these properties is particularly evident in KB5, RbB5, and BaB5, with Tc values of ∼14.7, 18.6, and 16.3 K and Hv values of ∼35.1, 32.4, and 33.8 GPa, respectively. The results presented here reveal that pentaborides can provide a framework for exploring and designing novel superconducting materials with favorable hardness at achievable pressures and even under ambient conditions.","PeriodicalId":54221,"journal":{"name":"Matter and Radiation at Extremes","volume":"8 1","pages":""},"PeriodicalIF":5.1,"publicationDate":"2023-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82308141","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

Quantum splitting of electron peaks in ultra-strong fields 超强场中电子峰的量子分裂

IF 5.1 1区物理与天体物理

Matter and Radiation at Extremes Pub Date : 2023-09-01 DOI: 10.1063/5.0157663

Bo Zhang, Zhi-Meng Zhang, Wei-Min Zhou

引用次数: 0

Discovery of the Baijifeng impact structure in Tonghua, Jilin, China 吉林通化白芨峰冲击构造的发现

IF 5.1 1区物理与天体物理

Matter and Radiation at Extremes Pub Date : 2023-09-01 DOI: 10.1063/5.0172186

Ming Chen, Yang Lu, Jiahao Ning, Wenge Yang, J. Shu, Ho-Kwang Mao

引用次数: 0

Laser-driven electrodynamic implosion of fast ions in a thin shell 薄壳中快离子的激光驱动电动力学内爆

IF 5.1 1区物理与天体物理

Matter and Radiation at Extremes Pub Date : 2023-08-11 DOI: 10.1063/5.0156113

S. Gus’kov, P. Korneev, M. Murakami

引用次数: 1

Suppressing stimulated Raman side-scattering with vector light 用矢量光抑制受激拉曼侧散射

IF 5.1 1区物理与天体物理

Matter and Radiation at Extremes Pub Date : 2023-08-11 DOI: 10.1063/5.0157811

Xiaobao Jia, Q. Jia, R. Yan, Jian Zheng

{"title":"Suppressing stimulated Raman side-scattering with vector light","authors":"Xiaobao Jia, Q. Jia, R. Yan, Jian Zheng","doi":"10.1063/5.0157811","DOIUrl":"https://doi.org/10.1063/5.0157811","url":null,"abstract":"Recent observations of stimulated Raman side-scattering (SRSS) in different laser inertial confinement fusion ignition schemes have revealed that there is an underlying risk of SRSS on ignition. In this paper, we propose a method that uses the nonuniform nature of the polarization of vector light to suppress SRSS, and we give an additional threshold condition determined by the parameters of the vector light. For SRSS at 90°, where the scattered electromagnetic wave travels perpendicular to the density profile, the variation in polarization of the pump will change the wave vector of the scattered light, thereby reducing the growth length and preventing the scattered electromagnetic wave from growing. This suppression scheme is verified through three-dimensional particle-in-cell simulations. Our illustrative simulation results demonstrate that for linearly polarized Gaussian light, there is a strong SRSS signal in the 90° direction, whereas for vector light, there is very little SRSS signal, even when the conditions significantly exceed the threshold for SRSS. We also discuss the impact of vector light on stimulated Raman backscattering, collective stimulated Brillouin scattering and two-plasmon decay.","PeriodicalId":54221,"journal":{"name":"Matter and Radiation at Extremes","volume":"35 1","pages":""},"PeriodicalIF":5.1,"publicationDate":"2023-08-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75768114","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

Triggering dynamics of acetylene topochemical polymerization 乙炔拓扑化学聚合的触发动力学

IF 5.1 1区物理与天体物理

Matter and Radiation at Extremes Pub Date : 2023-08-04 DOI: 10.1063/5.0151609

Xingyu Tang, Xiao Dong, Chunfang Zhang, Kuo Li, Haiyan Zheng, H. Mao

引用次数: 0

The near-room-temperature upsurge of electrical resistivity in Lu-H-N is not superconductivity, but a metal-to-poor-conductor transition Lu-H-N中接近室温的电阻率上升不是超导性，而是金属到不良导体的转变

1区物理与天体物理

Matter and Radiation at Extremes Pub Date : 2023-07-28 DOI: 10.1063/5.0166430

Di Peng, Qiaoshi Zeng, Fujun Lan, Zhenfang Xing, Yang Ding, Ho-kwang Mao

引用次数: 2