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Probing the radiation-dominated regime of laser-plasma interaction in multibeam configurations of petawatt lasers

Physical Review E 2025年第4期111卷 045212-045212页

作者： T. V. Liseykina E. E. Peganov S. V. Popruzhenko Institute of Computational Mathematics and Mathematical Geophysics SB RAS Lavrentiev Ave. 6 Novosibirsk 630090 Russia and Institute of Applied Physics RAS Ul'yanov Street 46 Nizhny Novgorod 603950 Russia National Research Nuclear University MEPhI Kashirskoe shosse 31 Moscow 115409 Russia Prokhorov General Physics Institute RAS Vavilova 38 Moscow 119991 Russia and Institute of Applied Physics RAS Ul'yanov Street 46 Nizhny Novgorod 603950 Russia

We numerically model the ultrarelativistic dynamics of a dense plasma microtarget, in a focus of several intersecting femtosecond laser pulses of multipetawatt power each. The aim is to examine prospective experimental approaches to the search for the Inverse Faraday Effect induced by radiation friction. We show that multibeam configurations allow lowering the single beam peak laser power required to generate a detectable quasistatic longitudinal magnetic field excited due to the radiation reaction force. The effect is significant at angles around 10o between the beam propagation axes, almost vanishes when the angle exceeds 20o, and remains rather stable with respect to the variations of relative phases and amplitudes of the beams. Quantum recoil, accounted for semiclassically, is shown to considerably suppress the longitudinal magnetic field, which, however, remains sizable. We conclude that, by using four infrared femtosecond linearly polarized pulses of 15 petawatt power each, crossing at angles of ≈10o, the radiation-dominated regime of laser-plasma interaction can be experimentally demonstrated.

关键词： Beam plasma interactions

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ON A CLASS OF ANISOTROPIC MUCKENHOUPT WEIGHTS AND THEIR APPLICATIONS TO p-LAPLACE EQUATIONS

arXiv

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arXiv 2023年

作者： Miao, Changxing Zhao, Zhiwen Institute of Applied Physics and Computational Mathematics P.O. Box 8009 Beijing100088 China School of Mathematics and Physics University of Science and Technology Beijing Beijing100083 China Beijing Computational Science Research Center Beijing100193 China

In this paper, a class of anisotropic weights having the form of |x'|θ1 |x|θ2 |xn|θ3 in dimensions n ≥ 2 is considered, where x = (x', xn) and x' = (x1, ..., xn-1). We first find the optimal range of (θ1, θ2, θ3) such that this type of weights belongs to the Muckenhoupt class Ap. Then we further study its doubling property, which shows that it provides an example of a doubling measure but is not in Ap. As a consequence, we obtain anisotropic weighted Poincaré and Sobolev inequalities, which are used to study the local behavior for solutions to non-homogeneous weighted p-Laplace equations. Copyright © 2023, The Authors. All rights reserved.

关键词： Laplace equation

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Theoretical prediction of superconductivity in two-dimensional hydrogenated metal diboride: M2B2H(M=Al, Mg, Mo, W)

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Physical Review Materials 2023年第11期7卷 114802-114802页

作者： Yu-Lin Han Hao-Dong Liu Na Jiao Meng-Meng Zheng Hong-Yan Lu Bao-Tian Wang Ping Zhang School of Physics and Physical Engineering Qufu Normal University Qufu 273165 China Institute of High Energy Physics Chinese Academy of Sciences Beijing 100049 China Spallation Neutron Source Science Center Dongguan 523803 China Institute of Applied Physics and Computational Mathematics Beijing 100088 China

In recent years, superconductivity in two-dimensional (2D) layered metal borides has aroused much interest. Here, based on first-principles calculations, we theoretically report four 2D hydrogenated metal diborides: M2B2H(M=Al, Mg, Mo, W), and investigate their geometrical structures, electronic structures, phonon dispersions, thermal stability, dynamic stability, electron-phonon coupling (EPC), superconducting properties, and so on. Results reveal that the introduction of hydrogen atoms expands the frequency range of the phonon spectrum of monolayer M2B2, and significantly increases the EPC. We systematically analyze the specific origins of superconductivity in these hydrogenated low-dimensional systems. The obtained EPC constants λ of M2B2H(M=Al, Mg, Mo, W) are 2.93, 0.86, 1.09, and 1.40, and the corresponding superconducting transition temperatures (Tc) are 52.6, 23.2, 21.5, and 18.6 K, respectively. By further applying electron/hole doping or biaxial tensile strain, the Tc can be further increased, with the highest Tc of 60.2 K in Al2B2H under 0.4% biaxial tensile strain. The predicted M2B2H provides a new platform for 2D superconductivity and may have potential applications in 2D nanodevices.

关键词： Electronic structure Phonons Superconductivity 2-dimensional systems High-temperature superconductors Superconductors BCS theory First-principles calculations

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INTERTWINING OPERATORS BEYOND THE STARK EFFECT

arXiv

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arXiv 2024年

作者： Fanelli, Luca Su, Xiaoyan Wang, Ying Zhang, Junyong Zheng, Jiqiang Ikerbasque Basque Foundation for Science Departamento de Matemáticas Universidad del País Vasco Euskal Herriko Unibertsitatea PV/EHU Leioa48940 Spain BCAM - Basque Center for Applied Mathematics Bilbao48009 Spain Loughborough University Loughborough United Kingdom Basque Center for Applied Mathematics Bilbao Spain Department of Mathematics Beijing Institute of Technology Beijing100081 China Institute of Applied Physics and Computational Mathematics National Key Laboratory of Computational Physics Beijing100088 China

The main mathematical manifestation of the Stark effect in quantum mechanics is the shift and the formation of clusters of eigenvalues when a spherical Hamiltonian is perturbed by lower order terms. Understanding this mechanism turned out to be fundamental in the description of the large-time asymptotics of the associated Schrödinger groups and can be responsible for the lack of dispersion [14, 16, 17]. Recently, Miao, Su, and Zheng introduced in [31] a family of spectrally projected intertwining operators, reminiscent of the Kato’s wave operators, in the case of constant perturbations on the sphere (inverse-square potential), and also proved their boundedness in Lp. Our aim is to establish a general framework in which some suitable intertwining operators can be defined also for non constant spherical perturbations in space dimensions 2 and higher. In addition, we investigate the mapping properties between Lp-spaces of these operators. In 2D, we prove a complete result, for the Schrödinger Hamiltonian with a (fixed) magnetic potential an electric potential, both scaling critical, allowing us to prove dispersive estimates, uniform resolvent estimates, and Lp-bounds of Bochner–Riesz means. In higher dimensions, apart from recovering the example of inverse-square potential, we can conjecture a complete result in presence of some symmetries (zonal potentials), and open some interesting spectral problems concerning the asymptotics of eigenfunctions. © 2024, CC BY.

关键词： Eigenvalues and eigenfunctions

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H"ormander oscillatory integral operators: a revisit

arXiv

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arXiv 2025年

作者： Gao, Chuanwei Gao, Zhong Miao, Changxing School of Mathematical Sciences Capital Normal University Beijing100048 China Institute of Applied Physics and Computational Mathematics P.O. Box 8009 Beijing100088 China

In this paper, we present new proofs for both the sharp Lp estimate and the decoupling theorem for the Hörmander oscillatory integral operator. The sharp Lp estimate was previously obtained by Stein [18] and Bourgain-Guth [5] via the T T ∗ and multilinear methods, respectively. We provide a unified proof based on the bilinear method for both odd and even dimensions. The strategy is inspired by Barron’s work [1] on the restriction problem. The decoupling theorem for the Hörmander oscillatory integral operator can be obtained by the approach in [2], where the key observation can be roughly formulated as follows: in a physical space of sufficiently small scale, the variable setting can be essentially viewed as translation-invariant. In contrast, we reprove the decoupling theorem for the Hörmander oscillatory integral operator through the Pramanik-Seeger approximation approach [17]. Both proofs rely on a scale-dependent induction argument, which can be used to deal with perturbation terms in the phase function. © 2025, CC BY.

关键词： Perturbation techniques

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Investigating generalized minimal supergravity in the MSSM through the long-lived bino NLSP at the HL-LHC

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Physical Review D 2024年第5期110卷 055006页

作者： Wenxing Zhang Waqas Ahmed Imtiaz Khan Tianjun Li Shabbar Raza Department of Physics Hebei Key Laboratory of High-Precision Computation and Application of Quantum Field Theory Baoding 071002 China Hebei Research Center of the Basic Discipline for Computational Physics Baoding 071002 China Tsung-Dao Lee Institute and School of Physics and Astronomy Center for Fundamental Physics and School of Mathematics and Physics CAS Key Laboratory of Theoretical Physics School of Physical Sciences

The axino, the supersymmetric partner of the axion, is a well-motivated warm/hot dark/cold matter candidate and provides a natural solution to the relic density problem for the binolike neutralino if it is the lightest supersymmetric particle (LSP). With the generalized minimal supergravity, we study such kind of the viable parameter space where the binolike neutralino is the next-to-LSP (NLSP) and the axino is the LSP. In addition, we consider a scenario where the bino is a long-lived NLSP with the lifetime varying from 10−6 to 10−4 s and then propose a new signal searching scheme involving one displaced photon together with the large missing transverse momentum at the HL-LHC. The binolike lightest neutralino lies under or around 100 GeV and is produced as a decay product of the right-handed sleptons. The relevant axion coupling fa can be probed up to O(109) GeV at 2σ level for the right-handed slepton mass under 800 GeV.

关键词： Particle dark matter Particle decays Supersymmetric models

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Description of elastic scattering induced by the unstable nuclei^(9,10,11,13,14)C

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Chinese physics C 2021年第11期45卷 122-127页

作者： Yong-Li Xu Yin-Lu Han Xin-Wu Su Xiao-Jun Sun Hai-Ying Liang Hai-Rui Guo Chong-Hai Cai College of Physics and Electronic Science Shanxi Datong UniversityDatong 037009China Key Laboratory of Nuclear Data China Institute of Atomic EnergyP.O.BOX(275-41)Beijing 102413China College of Physics Guangxi Normal UniversityGuilin 541004China Guangxi Key Laboratory of Nuclear Physics and Nuclear Technology Guangxi Normal UniversityGuilin 541004China Institute of Applied Physics and Computational Mathematics Beijing 100094China Department of Physics Nankai UniversityTianjin 300071China

The elastic-scattering angular distributions and total reaction cross sections of ^(9,10,11,13,14)C projectiles were predicted using the obtained ^(12)C and ^(9)Be global optical model potentials,*** predictions were analyzed in detail by comparison with the available experimental *** results indicate that the ^(12)C and ^(9)Be global optical model potentials provide a satisfactory description of the elastic scattering data for the reactions induced by the ^(9,10,11,13)*** the neutron-rich carbon isotope ^(14)C,the elastic scattering can be well described by changing the real part radius parameter of the ^(12)C global optical model *** physical explanations for the observed differences are further discussed.

关键词： optical model potential elastic-scattering angular distribution reaction cross section

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Rescattering of stimulated Raman side scattering in nonuniform plasmas

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Matter and Radiation at Extremes 2024年第5期9卷 68-76页

作者： S.Tan Q.Wang Y.Chen W.B.Yao C.Z.Xiao J.F.Myatt School of Physics and Electronics Hunan UniversityChangsha 410082China Institute of Applied Physics and Computational Mathematics Beijing 100094China School of Electrical and Information Engineering Anhui University of Science and TechnologyHuainanAnhui 232001China Department of Electrical and Computer Engineering University of Alberta9211116 St.NWEdmontonAlberta T6G 1H9Canada

Rescattering of stimulated Raman side scattering(SRSS)is observed for the first time via two-dimensional(2D)particle-in-cell(PIC)*** construct a theoretical model for the rescattering process,which can predict the region of occurrence of mth-order SRSS and estimate its *** rescattering process is identified by the 2D PIC simulations under typical conditions of a direct-drive inertial confinement fusion *** electrons produced by second-order SRSS propagate nearly perpendicular to the density gradient and gain nearly the same energy as in first-order SRSS,but there is no cascade acceleration to produce superhot *** studies for a wide range of ignition conditions show that SRSS and associated rescatterings are robust and important processes in inertial confinement fusion.

关键词： nonuniform acceleration scattering

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Femtosecond Time-Resolved Neighbor Roles in the Fragmentation Dynamics of Molecules in a Dimer

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Physical Review Letters 2022年第2期129卷 023001-023001页

作者： Xitao Yu Xinyu Zhang Xiaoqing Hu Xinning Zhao Dianxiang Ren Xiaokai Li Pan Ma Chuncheng Wang Yong Wu Sizuo Luo Dajun Ding Institute of Atomic and Molecular Physics Jilin University Changchun 130012 China Jilin Provincial Key Laboratory of Applied Atomic and Molecular Spectroscopy Jilin University Changchun 130012 China Institute of Applied Physics and Computational Mathematics Beijing 100088 China

How the neighbor effect plays its role in the fragmentation of molecular clusters attracts great attention for physicists and chemists. Here, we study this effect in the fragmentation of N2O dimer by performing three-body coincidence measurements on the femtosecond timescale. Rotations of bound N2O+ triggered by neutral or ionic neighbors are tracked. The forbidden dissociation path between B2Π and Π4 is opened by the spin-exchange effect due to the existence of neighbor ions, leading to a new channel of N2O+→NO+N+ originating from BΠ2. The formation and dissociation of the metastable product N3O2+ from two ion-molecule reaction channels are tracked in real time, and the corresponding trajectories are captured. Our results demonstrate a significant and promising step towards the understanding of neighbor roles in the reactions within clusters.

关键词： Atomic & molecular clusters Collective effects in clusters Light-matter interaction Van der Waals interaction Clusters Photonic crystal lasers Photoionization

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Quench characteristics and mechanical responses during quench propagation in rare earth barium copper oxide pancake coils

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applied mathematics and Mechanics(English Edition) 2021年第2期42卷 235-250页

作者： Mengdie NIU Jing XIA Huadong YONG Youhe ZHOU Key Laboratory of Mechanics on Disaster and Environment in Western China The Ministry of Education of ChinaLanzhou UniversityLanzhou 730000China Department of Mechanics and Engineering Sciences College of Civil Engineering and MechanicsLanzhou UniversityLanzhou 730000China Institute of Applied Physics and Computational Mathematics Beijing 100094China

Quench and mechanical behaviors are critical issues in high temperature superconducting(HTS)*** this paper,the quench characteristics in the rare earth barium copper oxide(REBCO)pancake coil at 4.2K are analyzed,and a two-dimensional(2D)axisymmetric electro-magneto-thermal model is *** effects of the constituent materials,background field,and coil size are *** elastoplastic mechanical model is used to study the corresponding mechanical responses during the quench *** variations of the temperature and strain in superconducting layers are *** results indicate that the radial strain evolutions can reflect the transverse quench propagation and the tensile hoop and radial stresses in superconducting layers increase with the quench *** possible damages are discussed with the consideration of the effects of the background field and coil *** is concluded that the high background field significantly increases the maximum tensile hoop and radial stresses in quenching coils and local damage may be caused.

关键词： rare earth barium copper oxide(REBCO)pancake coil hoop stress quench characteristic mechanical response radial stress

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