Matter and Radiation at Extremes最新文献_第4页

Strong electron correlation-induced Mott-insulating electrides of Ae5X3 (Ae = Ca, Sr, and Ba; X = As and Sb) 强电子相关诱导的 Ae5X3（Ae = Ca、Sr 和 Ba；X = As 和 Sb）莫特绝缘电荷

IF 5.1 1区物理与天体物理

Matter and Radiation at Extremes Pub Date : 2024-03-18 DOI: 10.1063/5.0187372

Ya Xu, Lu Zheng, Yunkun Zhang, Zhuangfei Zhang, QianQian Wang, Yuewen Zhang, Liangchao Chen, Chao Fang, Biao Wan, Huiyang Gou

{"title":"Strong electron correlation-induced Mott-insulating electrides of Ae5X3 (Ae = Ca, Sr, and Ba; X = As and Sb)","authors":"Ya Xu, Lu Zheng, Yunkun Zhang, Zhuangfei Zhang, QianQian Wang, Yuewen Zhang, Liangchao Chen, Chao Fang, Biao Wan, Huiyang Gou","doi":"10.1063/5.0187372","DOIUrl":"https://doi.org/10.1063/5.0187372","url":null,"abstract":"The presence of interstitial electrons in electrides endows them with interesting attributes, such as low work function, high carrier concentration, and unique magnetic properties. Thorough knowledge and understanding of electrides are thus of both scientific and technological significance. Here, we employ first-principles calculations to investigate Mott-insulating Ae5X3 (Ae = Ca, Sr, and Ba; X = As and Sb) electrides with Mn5Si3-type structure, in which half-filled interstitial electrons serve as ions and are spin-polarized. The Mott-insulating property is induced by strong electron correlation between the nearest interstitial electrons, resulting in spin splitting and a separation between occupied and unoccupied states. The half-filled antiferromagnetic configuration and localization of the interstitial electrons are critical for the Mott-insulating properties of these materials. Compared with that in intermetallic electrides, the orbital hybridization between the half-filled interstitial electrons and the surrounding atoms is weak, leading to highly localized magnetic centers and pronounced correlation effects. Therefore, the Mott-insulating electrides Ae5X3 have very large indirect bandgaps (∼0.30 eV). In addition, high pressure is found to strengthen the strong correlation effects and enlarge the bandgap. The present results provide a deeper understanding of the formation mechanism of Mott-insulating electrides and provide guidance for the search for new strongly correlated electrides.","PeriodicalId":54221,"journal":{"name":"Matter and Radiation at Extremes","volume":"54 1","pages":""},"PeriodicalIF":5.1,"publicationDate":"2024-03-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140171198","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

Virtual source approach for maximizing resolution in high-penetration gamma-ray imaging 最大限度提高高穿透伽马射线成像分辨率的虚拟源方法

IF 5.1 1区物理与天体物理

Matter and Radiation at Extremes Pub Date : 2024-03-15 DOI: 10.1063/5.0179781

Yuchi Wu, Shaoyi Wang, Bin Zhu, Yonghong Yan, Minghai Yu, Gang Li, Xiaohui Zhang, Yue Yang, Fang Tan, Feng Lu, Bi Bi, Xiaoqin Mao, Zhonghai Wang, Zongqing Zhao, Jingqin Su, Weimin Zhou, Yuqiu Gu

{"title":"Virtual source approach for maximizing resolution in high-penetration gamma-ray imaging","authors":"Yuchi Wu, Shaoyi Wang, Bin Zhu, Yonghong Yan, Minghai Yu, Gang Li, Xiaohui Zhang, Yue Yang, Fang Tan, Feng Lu, Bi Bi, Xiaoqin Mao, Zhonghai Wang, Zongqing Zhao, Jingqin Su, Weimin Zhou, Yuqiu Gu","doi":"10.1063/5.0179781","DOIUrl":"https://doi.org/10.1063/5.0179781","url":null,"abstract":"High-energy gamma-ray radiography has exceptional penetration ability and has become an indispensable nondestructive testing (NDT) tool in various fields. For high-energy photons, point projection radiography is almost the only feasible imaging method, and its spatial resolution is primarily constrained by the size of the gamma-ray source. In conventional industrial applications, gamma-ray sources are commonly based on electron beams driven by accelerators, utilizing the process of bremsstrahlung radiation. The size of the gamma-ray source is dependent on the dimensional characteristics of the electron beam. Extensive research has been conducted on various advanced accelerator technologies that have the potential to greatly improve spatial resolution in NDT. In our investigation of laser-driven gamma-ray sources, a spatial resolution of about 90 µm is achieved when the areal density of the penetrated object is 120 g/cm2. A virtual source approach is proposed to optimize the size of the gamma-ray source used for imaging, with the aim of maximizing spatial resolution. In this virtual source approach, the gamma ray can be considered as being emitted from a virtual source within the convertor, where the equivalent gamma-ray source size in imaging is much smaller than the actual emission area. On the basis of Monte Carlo simulations, we derive a set of evaluation formulas for virtual source scale and gamma-ray emission angle. Under optimal conditions, the virtual source size can be as small as 15 µm, which can significantly improve the spatial resolution of high-penetration imaging to less than 50 µm.","PeriodicalId":54221,"journal":{"name":"Matter and Radiation at Extremes","volume":"47 1","pages":""},"PeriodicalIF":5.1,"publicationDate":"2024-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140149595","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

Self-consistent and precise measurement of time-dependent radiative albedo of gold based on specially symmetrical triple-cavity Hohlraum 基于特别对称的三腔光室，自洽而精确地测量随时间变化的金辐射反照率

IF 5.1 1区物理与天体物理

Matter and Radiation at Extremes Pub Date : 2024-02-29 DOI: 10.1063/5.0177038

Zhiyu Zhang, Yang Zhao, Xiaoying Han, Liling Li, Bo Qing, Lifei Hou, Yulong Li, YuXue Zhang, Huan Zhang, Xiangming Liu, Bo Deng, Gang Xiong, Min Lv, Tuo Zhu, Chengwu Huang, Tianming Song, Yan Zhao, Yingjie Li, Lu Zhang, Xufei Xie, Jiyan Zhang, Jiamin Yang

{"title":"Self-consistent and precise measurement of time-dependent radiative albedo of gold based on specially symmetrical triple-cavity Hohlraum","authors":"Zhiyu Zhang, Yang Zhao, Xiaoying Han, Liling Li, Bo Qing, Lifei Hou, Yulong Li, YuXue Zhang, Huan Zhang, Xiangming Liu, Bo Deng, Gang Xiong, Min Lv, Tuo Zhu, Chengwu Huang, Tianming Song, Yan Zhao, Yingjie Li, Lu Zhang, Xufei Xie, Jiyan Zhang, Jiamin Yang","doi":"10.1063/5.0177038","DOIUrl":"https://doi.org/10.1063/5.0177038","url":null,"abstract":"A self-consistent and precise method to determine the time-dependent radiative albedo, i.e., the ratio of the reemission flux to the incident flux, for an indirect-drive inertial confinement fusion Hohlraum wall material is proposed. A specially designed symmetrical triple-cavity gold Hohlraum is used to create approximately constant and near-equilibrium uniform radiation with a peak temperature of 160 eV. The incident flux at the secondary cavity waist is obtained from flux balance analysis and from the shock velocity of a standard sample. The results agree well owing to the symmetrical radiation in the secondary cavity. A self-consistent and precise time-dependent radiative albedo is deduced from the reliable reemission flux and the incident flux, and the result from the shock velocity is found to have a smaller uncertainty than that from the multi-angle flux balance analysis, and also to agree well with the result of a simulation using the HYADES opacity.","PeriodicalId":54221,"journal":{"name":"Matter and Radiation at Extremes","volume":"4 1","pages":""},"PeriodicalIF":5.1,"publicationDate":"2024-02-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140010304","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 rapid cooling assembly design in a high-pressure cubic press apparatus 高压立方体压机中的新型快速冷却组件设计

IF 5.1 1区物理与天体物理

Matter and Radiation at Extremes Pub Date : 2024-02-26 DOI: 10.1063/5.0176025

Peiyan Wu, Yongjiang Xu, Yanhao Lin

{"title":"A novel rapid cooling assembly design in a high-pressure cubic press apparatus","authors":"Peiyan Wu, Yongjiang Xu, Yanhao Lin","doi":"10.1063/5.0176025","DOIUrl":"https://doi.org/10.1063/5.0176025","url":null,"abstract":"In traditional high-pressure–temperature assembly design, priority has been given to temperature insulation and retention at high pressures. This limits the efficiency of cooling of samples at the end of experiments, with a negative impact on many studies in high-pressure Earth and planetary science. Inefficient cooling of experiments containing molten phases at high temperature leads to the formation of quench textures, which makes it impossible to quantify key compositional parameters of the original molten phase, such as their volatile contents. Here, we present a new low-cost experimental assembly for rapid cooling in a six-anvil cubic press. This assembly not only retains high heating efficiency and thermal insulation, but also enables a very high cooling rate (∼600 °C/s from 1900 °C to the glass transition temperature). Without using expensive materials or external modification of the press, the cooling rate in an assembly (∼600 °C/s) with cube lengths of 38.5 mm is about ten times faster than that in the traditional assembly (∼60 °C/s). Experiments yielding inhomogeneous quenched melt textures when the traditional assembly is used are shown to yield homogeneous silicate glass without quench textures when the rapid cooling assembly is used.","PeriodicalId":54221,"journal":{"name":"Matter and Radiation at Extremes","volume":"47 1","pages":""},"PeriodicalIF":5.1,"publicationDate":"2024-02-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139981291","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

Unveiling a novel metal-to-metal transition in LuH2: Critically challenging superconductivity claims in lutetium hydrides 揭示 LuH2 中的新型金属-金属转变：对镥氢化物中的超导说法提出严峻挑战

IF 5.1 1区物理与天体物理

Matter and Radiation at Extremes Pub Date : 2024-02-22 DOI: 10.1063/5.0183701

Dong Wang, Ningning Wang, Caoshun Zhang, Chunsheng Xia, Weicheng Guo, Xia Yin, Kejun Bu, Takeshi Nakagawa, Jianbo Zhang, Federico Gorelli, Philip Dalladay-Simpson, Thomas Meier, Xujie Lü, Liling Sun, Jinguang Cheng, Qiaoshi Zeng, Yang Ding, Ho-kwang Mao

{"title":"Unveiling a novel metal-to-metal transition in LuH2: Critically challenging superconductivity claims in lutetium hydrides","authors":"Dong Wang, Ningning Wang, Caoshun Zhang, Chunsheng Xia, Weicheng Guo, Xia Yin, Kejun Bu, Takeshi Nakagawa, Jianbo Zhang, Federico Gorelli, Philip Dalladay-Simpson, Thomas Meier, Xujie Lü, Liling Sun, Jinguang Cheng, Qiaoshi Zeng, Yang Ding, Ho-kwang Mao","doi":"10.1063/5.0183701","DOIUrl":"https://doi.org/10.1063/5.0183701","url":null,"abstract":"Following the recent report by Dasenbrock-Gammon et al. [Nature 615, 244–250 (2023)] of near-ambient superconductivity in nitrogen-doped lutetium trihydride (LuH3−δNε), significant debate has emerged surrounding the composition and interpretation of the observed sharp resistance drop. Here, we meticulously revisit these claims through comprehensive characterization and investigations. We definitively identify the reported material as lutetium dihydride (LuH2), resolving the ambiguity surrounding its composition. Under similar conditions (270–295 K and 1–2 GPa), we replicate the reported sharp decrease in electrical resistance with a 30% success rate, aligning with the observations by Dasenbrock-Gammon et al. However, our extensive investigations reveal this phenomenon to be a novel pressure-induced metal-to-metal transition intrinsic to LuH2, distinct from superconductivity. Intriguingly, nitrogen doping exerts minimal impact on this transition. Our work not only elucidates the fundamental properties of LuH2 and LuH3, but also critically challenges the notion of superconductivity in these lutetium hydride systems. These findings pave the way for future research on lutetium hydride systems, while emphasizing the crucial importance of rigorous verification in claims of ambient-temperature superconductivity.","PeriodicalId":54221,"journal":{"name":"Matter and Radiation at Extremes","volume":"33 1","pages":""},"PeriodicalIF":5.1,"publicationDate":"2024-02-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139948430","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

Ultrahigh-brightness 50 MeV electron beam generation from laser wakefield acceleration in a weakly nonlinear regime 在弱非线性状态下通过激光汪场加速产生超高亮度 50 MeV 电子束

IF 5.1 1区物理与天体物理

Matter and Radiation at Extremes Pub Date : 2024-02-22 DOI: 10.1063/5.0189460

Zhongtao Xiang, Changhai Yu, Zhiyong Qin, Xuhui Jiao, Jiahui Cheng, Qiaoxuan Zhou, Gatie Axi, Jianghua Jie, Ya Huang, Jintan Cai, Jiansheng Liu

{"title":"Ultrahigh-brightness 50 MeV electron beam generation from laser wakefield acceleration in a weakly nonlinear regime","authors":"Zhongtao Xiang, Changhai Yu, Zhiyong Qin, Xuhui Jiao, Jiahui Cheng, Qiaoxuan Zhou, Gatie Axi, Jianghua Jie, Ya Huang, Jintan Cai, Jiansheng Liu","doi":"10.1063/5.0189460","DOIUrl":"https://doi.org/10.1063/5.0189460","url":null,"abstract":"We propose an efficient scheme to produce ultrahigh-brightness tens of MeV electron beams by designing a density-tailored plasma to induce a wakefield in the weakly nonlinear regime with a moderate laser energy of 120 mJ. In this scheme, the second bucket of the wakefield can have a much lower phase velocity at the steep plasma density down-ramp than the first bucket and can be exploited to implement longitudinal electron injection at a lower laser intensity, leading to the generation of bright electron beams with ultralow emittance together with low energy spread. Three-dimensional particle-in-cell simulations are carried out and demonstrate that high-quality electron beams with a peak energy of 50 MeV, ultralow emittance of ∼28 nm rad, energy spread of 1%, charge of 4.4 pC, and short duration less than 5 fs can be obtained within a 1-mm-long tailored plasma density, resulting in an ultrahigh six-dimensional brightness B6D,n of ∼2 × 1017 A/m2/0.1%. By changing the density parameters, tunable bright electron beams with peak energies ranging from 5 to 70 MeV, a small emittance of ≤0.1 mm mrad, and a low energy spread at a few-percent level can be obtained. These bright MeV-class electron beams have a variety of potential applications, for example, as ultrafast electron probes for diffraction and imaging, in laboratory astrophysics, in coherent radiation source generation, and as injectors for GeV particle accelerators.","PeriodicalId":54221,"journal":{"name":"Matter and Radiation at Extremes","volume":"205 1","pages":""},"PeriodicalIF":5.1,"publicationDate":"2024-02-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139948739","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

Fast efficient photon deceleration in plasmas by using two laser pulses at different frequencies 利用两个不同频率的激光脉冲在等离子体中实现快速高效的光子减速

IF 5.1 1区物理与天体物理

Matter and Radiation at Extremes Pub Date : 2024-02-22 DOI: 10.1063/5.0189638

Y. X. Wang, X. L. Zhu, S. M. Weng, P. Li, X. F. Li, H. Ai, H. R. Pan, Z. M. Sheng

{"title":"Fast efficient photon deceleration in plasmas by using two laser pulses at different frequencies","authors":"Y. X. Wang, X. L. Zhu, S. M. Weng, P. Li, X. F. Li, H. Ai, H. R. Pan, Z. M. Sheng","doi":"10.1063/5.0189638","DOIUrl":"https://doi.org/10.1063/5.0189638","url":null,"abstract":"The generation of ultrashort high-power light sources in the mid-infrared (mid-IR) to terahertz (THz) range is of interest for applications in a number of fields, from fundamental research to biology and medicine. Besides conventional laser technology, photon deceleration in plasma wakes provides an alternative approach to the generation of ultrashort mid-IR or THz pulses. Here, we present a photon deceleration scheme for the efficient generation of ultrashort mid-IR or THz pulses by using an intense driver laser pulse with a relatively short wavelength and a signal laser pulse with a relatively long wavelength. The signal pulse trails the driver pulse with an appropriate time delay such that it sits at the front of the second wake bubble that is driven by the driver pulse. Owing to its relatively long wavelength, the signal pulse will be subjected to a large gradient of the refractive index in the plasma wake bubble. Consequently, the photon deceleration in the plasma wake becomes faster and more efficient for signal pulses with longer wavelengths. This greatly enhances the capacity and efficiency of photon deceleration in the generation of ultrashort high-power light sources in the long-wavelength IR and THz spectral ranges.","PeriodicalId":54221,"journal":{"name":"Matter and Radiation at Extremes","volume":"31 1","pages":""},"PeriodicalIF":5.1,"publicationDate":"2024-02-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139948429","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

Collective coherent emission of electrons in strong laser fields and perspective for hard x-ray lasers 强激光场中电子的集体相干发射和硬 X 射线激光器的前景

IF 5.1 1区物理与天体物理

Matter and Radiation at Extremes Pub Date : 2024-02-16 DOI: 10.1063/5.0174508

E. G. Gelfer, A. M. Fedotov, O. Klimo, S. Weber

引用次数: 0

High-pressure minerals and new lunar mineral changesite-(Y) in Chang’e-5 regolith 嫦娥五号留下的高压矿物和新的月球矿物变化石-(Y)

IF 5.1 1区物理与天体物理

Matter and Radiation at Extremes Pub Date : 2024-02-11 DOI: 10.1063/5.0148784

Jing Yang, Wei Du

{"title":"High-pressure minerals and new lunar mineral changesite-(Y) in Chang’e-5 regolith","authors":"Jing Yang, Wei Du","doi":"10.1063/5.0148784","DOIUrl":"https://doi.org/10.1063/5.0148784","url":null,"abstract":"Forty-five years after the Apollo and Luna missions, China’s Chang’e-5 (CE-5) mission collected ∼1.73 kg of new lunar materials from one of the youngest basalt units on the Moon. The CE-5 lunar samples provide opportunities to address some key scientific questions related to the Moon, including the discovery of high-pressure silica polymorphs (seifertite and stishovite) and a new lunar mineral, changesite-(Y). Seifertite was found to be coexist with stishovite in a silica fragment from CE-5 lunar regolith. This is the first confirmed seifertite in returned lunar samples. Seifertite has two space group symmetries (Pnc2 and Pbcn) and formed from an α-cristobalite-like phase during “cold” compression during a shock event. The aftershock heating process changes some seifertite to stishovite. Thus, this silica fragment records different stages of an impact process, and the peak shock pressure is estimated to be ∼11 to 40 GPa, which is much lower than the pressure condition for coexistence of seifertite and stishovite on the phase diagram. Changesite-(Y), with ideal formula (Ca8Y)□Fe2+(PO4)7 (where □ denotes a vacancy) is the first new lunar mineral to be discovered in CE-5 regolith samples. This newly identified phosphate mineral is in the form of columnar crystals and was found in CE-5 basalt fragments. It contains high concentrations of Y and rare earth elements (REE), reaching up to ∼14 wt. % (Y,REE)2O3. The occurrence of changesite-(Y) marks the late-stage fractional crystallization processes of CE-5 basalts combined with silicate liquid immiscibility. These new findings demonstrate the significance of studies on high-pressure minerals in lunar materials and the special nature of lunar magmatic evolution.","PeriodicalId":54221,"journal":{"name":"Matter and Radiation at Extremes","volume":"91 1","pages":""},"PeriodicalIF":5.1,"publicationDate":"2024-02-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139768094","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

Characterization of bright betatron radiation generated by direct laser acceleration of electrons in plasma of near critical density 近临界密度等离子体中电子直接激光加速产生的明亮贝塔电子辐射的特征

IF 5.1 1区物理与天体物理

Matter and Radiation at Extremes Pub Date : 2024-02-11 DOI: 10.1063/5.0181119

J. Cikhardt, M. Gyrdymov, S. Zähter, P. Tavana, M. M. Günther, N. Bukharskii, N. Borisenko, J. Jacoby, X. F. Shen, A. Pukhov, N. E. Andreev, O. N. Rosmej

{"title":"Characterization of bright betatron radiation generated by direct laser acceleration of electrons in plasma of near critical density","authors":"J. Cikhardt, M. Gyrdymov, S. Zähter, P. Tavana, M. M. Günther, N. Bukharskii, N. Borisenko, J. Jacoby, X. F. Shen, A. Pukhov, N. E. Andreev, O. N. Rosmej","doi":"10.1063/5.0181119","DOIUrl":"https://doi.org/10.1063/5.0181119","url":null,"abstract":"Directed x-rays produced in the interaction of sub-picosecond laser pulses of moderate relativistic intensity with plasma of near-critical density are investigated. Synchrotron-like (betatron) radiation occurs in the process of direct laser acceleration (DLA) of electrons in a relativistic laser channel when the electrons undergo transverse betatron oscillations in self-generated quasi-static electric and magnetic fields. In an experiment at the PHELIX laser system, high-current directed beams of DLA electrons with a mean energy ten times higher than the ponderomotive potential and maximum energy up to 100 MeV were measured at 1019 W/cm2 laser intensity. The spectrum of directed x-rays in the range of 5–60 keV was evaluated using two sets of Ross filters placed at 0° and 10° to the laser pulse propagation axis. The differential x-ray absorption method allowed for absolute measurements of the angular-dependent photon fluence. We report 1013 photons/sr with energies &gt;5 keV measured at 0° to the laser axis and a brilliance of 1021 photons s−1 mm−2 mrad−2 (0.1%BW)−1. The angular distribution of the emission has an FWHM of 14°–16°. Thanks to the ultra-high photon fluence, point-like radiation source, and ultra-short emission time, DLA-based keV backlighters are promising for various applications in high-energy-density research with kilojoule petawatt-class laser facilities.","PeriodicalId":54221,"journal":{"name":"Matter and Radiation at Extremes","volume":"308 1","pages":""},"PeriodicalIF":5.1,"publicationDate":"2024-02-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139767978","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