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Simulations of electron zebra stripes in the inner radiation belt using a composite empirical electric field model

science China Earth sciences 2025年第1期68卷 27-38页

作者： Ziyang WANG Ying LIU Qiugang ZONG Hong ZOU Yuguang YE Xuzhi ZHOU Chao YUE Shan WANG Institute of Space Physics and Applied Technology Peking UniversityBeijing100871China State Key Laboratory of Lunar and Planetary Science Macao University of Science and TechnologyMacao999078China

The phenomenon termed“zebra stripes”manifests as regular patterns in the energy-space(L shell)spectrum of energetic electrons(ranging from tens to hundreds ke V)within the inner radiation *** structures exhibit drift-periodic behavior and commonly arise from large-scale electric field perturbations near the substorm *** this study,we introduce a composite electric field model and replicate the formation,structure,and evolution of zebra stripes using a bounce-averaged test particle code under this electric field ***-resolution measurements of energetic electrons obtained from the Van Allen Probes and the recently launched Macao science Satellites-1 are used as initial conditions and served to validate our test particle *** analyses between observed data and simulations demonstrate our test particle method's efficacy in capturing zebra stripes'general ***,the composite model proves capable of reproducing realistic variations in the electric field within the inner radiation belt to a certain ***,subtle differences emerge in the flux strength and the positions of *** disparities primarily stem from limitations inherent in the electric field model and the initial conditions of the *** that the model represents an average case,it is conceivable that real-world scenarios may deviate from the average,thereby introducing variations in the observed phenomena.

关键词： Zebra stripes Inner radiation belt Large-scale electric fields Van Allen Probes Macao science Satellite

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Calibration of the Solar X-ray Detector on-board the Macao science Satellite-1B for Soft X-ray Detection

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science China Earth sciences 2025年第1期68卷 11-26页

作者： Man-Hei NG Xiaoping ZHANG Jianwu CHEN Yongqiang SHI Fuchang ZUO Wenxi PENG Weichun FU Liansheng LI Pengwei LUO Chi-Long TANG Guozheng ZHANG Zhiwu MEI Li WANG Cunhui LI Jiaming OU Yanyan Xu State Key Laboratory of Lunar and Planetary Sciences Macao University of Science and TechnologyMacao999078China Space Optoelectronic Measurement and Perception Laboratory Beijing Institute of Control EngineeringBeijing100190China Institute of High Energy Physics Chinese Academy of SciencesBeijing100049China Science and Technology on Vacuum Technology and Physics Laboratory Lanzhou Institute of PhysicsLanzhou730000China China National Space Administration(CNSA) Macao Center for Space Exploration and ScienceMacao999078China

The Solar X-ray Detector(SXD)on-board the Macao science Satellite-1B(MSS-1B)was successfully launched via the Chinese Long March-2C rocket on 21 May 2023,and commenced operations in early June of the same *** MSS-1B/Soft X-ray Detection Units(SXDUs)employ two silicon drift detectors(SDDs),providing a wide range of energy spectra spanning from 0.7 to 24 ***,the SXDUs deliver a high-resolution capability of 0.14 keV@5.9 keV and operate with a time cadence of 1 ***,we perform thorough calibrations of the MSS-1B/SXDUs,employing a combination of ground experiments and *** addition,quantitative analysis comparing the flux measurements obtained by the MSS-1B/SXDUs to the data collected by the Geostationary Operational Environmental Satellite(GOES),provides compelling evidence of their ***,the preliminary spectral analysis results showcase the robustness and expected performance of the MSS-1B/SXDUs,unlocking their potential for facilitating the study of dynamic evolution of solar ***,the innovative MSS-1B/Solar X-ray Detector facilitates concurrent observations of solar soft and hard X-rays,thereby making valuable contributions to the advancements in solar research.

关键词： Macao science Satellite-1B(MSS-1B) Calibration Solar X-Ray Detector Spectrometer Soft X-rays Solar flares Solar abundances

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Scanning tunneling microscopy study on symmetry breaking of charge density wave in FeGe

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Chinese physics B 2025年第4期34卷 55-61页

作者： Jiakang Zhang Ziyuan Chen Xueliang Wu Mingzhe Li Yuanji Li Ruotong Yin Jiashuo Gong Shiyuan Wang Aifeng Wang Dong-Lai Feng Ya-Jun Yan School of Emerging Technology and Department of Physics University of Science and Technology of ChinaHefei 230026China Low temperature Physics Laboratory College of Physics and Center of Quantum Materials and DevicesChongqing UniversityChongqing 401331China National Synchrotron Radiation Laboratory and School of Nuclear Science and Technology New Cornerstone Science LaboratoryUniversity of Science and Technology of ChinaHefei 230026China Hefei National Laboratory University of Science and Technology of ChinaHefei 230026China

The complex symmetry breaking states in AV3Sb5 family have attracted extreme research attention,but controversy still exists,especially in the question of time reversal symmetry breaking of the charge density wave(CDW).Most recently,a chiral CDW has been suggested in kagome magnet FeGe,but the related study is very ***,we use a scanning tunneling microscope to study the symmetry breaking behavior of both the short-and long-range CDWs in *** from previous studies,our study reveals an isotropic long-range CDW without obvious symmetry breaking,while local rotational symmetry breaking appears in the short-range CDW,which may be related to the existence of strong structural ***,the charge distribution of the short-range CDW is inert to the applied external magnetic fields and the detailed spin arrangements of FeGe,inconsistent with the expectation of a chiral CDW associated with chiral *** results rule out the existence of spontaneous chiral and rotational symmetry breaking in the CDW state of FeGe,putting strong constraints on the further understanding of CDW mechanism.

关键词： symmetry breaking kagome magnet charge density wave

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Comprehensive analysis of noise in Macao science Satellite-1 vector magnetometer data

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Earth and Planetary physics 2025年第3期9卷 532-540页

作者： SiShan Song Fan Yin Qin Yan Hermann Lühr Chao Xiong Yi Jiang PengFei Liu Department of Space Physics School of Earth and Space Science and TechnologyHubei Luojia LaboratoryWuhan UniversityWuhan 430072China State Key Laboratory of Lunar and Planetary Sciences Macao University of Science and TechnologyMacao 999078China Macao Institute of Space Technology and Application Macao University of Science and TechnologyMacao 999078China GFZ Helmholtz Centre for Geosciences Section 2.3 GeomagnetismPotsdamGermany

The Macao science Satellite-1(known as MSS-1)is the first scientific exploration satellite that was designed to measure the Earth's low latitude magnetic field at high resolution and with high precision by collecting data in a near-equatorial *** field data from MSS-1's onboard Vector Fluxgate Magnetometer(VFM),collected at a sample rate of 50 Hz,allows us to detect and investigate sources of magnetic data contamination,from DC to relevant Nyquist *** we report two types of artificial disturbances in the VFM *** is V-shaped events concentrated at night,with frequencies sweeping from the Nyquist frequency down to zero and back *** other is 5-Hz events(ones that exhibit a distinct 5 Hz spectrum peak);these events are always accompanied by intervals of spiky signals,and are clearly related to the attitude control of the *** analyses show that VFM noise levels in daytime are systematically lower than in *** daily average noise levels exhibit a period of about 52 *** V-shaped events are strongly correlated with higher VFM noise levels.

关键词： Macao science Satellite-1 Vector Fluxgate Magnetometer artificial disturbances noise features

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GRB 201223A: Implication of Fallback Accretion onto the Newborn Black Hole from its Multiband Afterglow

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Research in Astronomy and Astrophysics 2025年第2期25卷 13-22页

作者： Tian-Hua Lu Dong Xu Wei-Hua Lei Shao-Yu Fu Shuai-Qing Jiang Zi-Pei Zhu Xing Liu Jie An Key Laboratory of Space Astronomy and Technology National Astronomical Observatories Chinese Academy of Sciences School of Astronomy and Space Science University of Chinese Academy of Sciences Chinese Academy of Sciences Department of Astronomy School of Physics Huazhong University of Science and Technology

Multiband afterglow observations of gamma-ray bursts（GRBs） are important for studying the central ***201223A is a GRB with prompt optical detection by GW *** we report on the early optical afterglow of GRB 201223A detected by NEXT（only 2.8 minutes after the Swift/BAT trigger）,which smoothly connects the prompt optical emission and the afterglow *** Amati diagrams and considering the detection of afterglow emission in the Swift u-band,we suggest a redshift range of *** on our optical data and combined with early optical observation from GW AC and early X-ray data from Swift/XRT,a multiband fitting is performed using PyFRS,and we obtain the best afterglow parameters（assuming a redshift of z=1.0）:EK,iso=5.01-1.70+1.91× 1054erg,Γ0=426.58-138.18+148.86,θj=25.98-10.54+9.67deg,n0=0.30-0.26+3.78cm-3,p=2.32-0.01+0.01,εe=3.31-0.86+1.59× 10-5,εB=3.47-2.62+4.12× *** late-time X-ray shows a re-brightening,indicating late-time central engine *** comparing the leading two central engine models,i.e.,magnetar model and hyperaccreting black hole model,we find that the fallback accretion onto a newborn black hole provides a better explanation for the X-ray re-brightening with fallback accretion rate Mp（■）2.76 × 10-9M⊙s-1and the total fallback accreted mass Mfb（■）1.41 × 10-6M⊙.

关键词： GRB: central engine GRB: afterglow GRB: GRB 201223A

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Photoemission evidence of a novel charge order in kagome metal FeGe

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science China(physics,Mechanics & Astronomy) 2025年第6期Mechanics & Astronomy) .卷 176-182页

作者： Zhisheng Zhao Tongrui Li Peng Li Xueliang Wu Jianghao Yao Ziyuan Chen Yajun Yan Shengtao Cui Zhe Sun Yichen Yang Zhicheng Jiang Zhengtai Liu Alex Louat Timur Kim Cephise Cacho Aifeng Wang Yilin Wang Dawei Shen Juan Jiang Donglai Feng Department of Physics School of Emerging Technology University of Science and Technology of China Hefei National Laboratory University of Science and Technology of China National Synchrotron Radiation Laboratory School of Nuclear Science and Technology University of Science and Technology of China Low Temperature Physics Laboratory College of Physics and Center of Quantum Materials and Devices Chongqing University State Key Laboratory of Functional Materials for Informatics Shanghai Institute of Microsystem and Information Technology (SIMIT)Chinese Academy of Sciences Shanghai Synchrotron Radiation Facility Shanghai Advanced Research Institute Chinese Academy of Sciences Diamond Light Source Ltd. Harwell Science and Innovation Campus New Cornerstone Science Laboratory University of Science and Technology of China

The kagome metal Fe Ge provides a rich platform for understanding the mechanisms behind competing orders, as it exhibits charge order(CO) emerging deep within the antiferromagnetic phase. To investigate the intrinsic origin of this behavior, we examine the evolution of the low-energy electronic structure across the phase transition in annealed Fe Ge samples using angleresolved photoemission spectroscopy. We find no evidence supporting a conventional nesting mechanism, such as Fermi surface nesting or van Hove singularities. However, we observe two notable changes in the band structure: an electron-like band around the K point and another around the A point, both shifting upward in energy when CO forms. These findings are consistent with our density-functional theory calculations, which suggest that the charge order in Fe Ge is primarily driven by magnetic energy savings due to a lattice distortion involving Ge1-dimerization. Our results provide photoemission evidence supporting this novel mechanism for CO formation in Fe Ge, in contrast to the conventional nesting-driven mechanisms.

关键词： kagome metal charge order electronic structure angle-resolved photoemission spectroscopy

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Effect of copper/tungsten heterophase interface on radiation resistance: Insights from atomistic simulations

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Chinese physics B 2025年第4期34卷 501-508页

作者： Wen Chen Min Li Bao-Qin Fu Tun Chen Jie-Chao Cui Qing Hou Key Laboratory of Radiation Physics and Technology of the Ministry of Education Institute of Nuclear Science and TechnologySichuan UniversityChengdu 610064China

Nanostructured materials have demonstrated superior radiation-damage tolerance compared to their coarse-grained counterparts,contributing to the extended lifespan of nuclear ***,the mechanisms underlying this enhanced irradiation resistance remain *** this study,we present atomistic simulations to investigate the impact of Cu/W heterophase interface on the evolution of irradiation-induced *** simulation results reveal that the Cu/W interfaces can act as defect sinks,effectively trapping self-interstitial atoms(SIAs).Furthermore,the interface demonstrates both the interstitial emission and interstitial transfer mechanisms,wherein the trapped W SIAs facilitate the emission of Cu atoms from the interface to the Cu *** emitted Cu SIAs can promote defect recombination on the Cu side,leading to a reduced defect concentration in the Cu/W ***,these combined mechanisms contribute to a lower overall concentration of irradiation-induced defect,thereby enhancing the radiation resistance of Cu/W nanomultilayers.

关键词： molecular dynamics Cu/W nano-multilayers interstitial transfer mechanism radiation resistance

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Design and experimental study of a field-reversed configuration plasma thruster prototype

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Plasma science and technology 2025年第3期27卷 118-126页

作者： Yuxuan HUANG Ming ZHANG Yong YANG Fangwei LYU Xiaopeng YI Chaofan LYU Yisong ZHANG Bo RAO State Key Laboratory of Advanced Electromagnetic Technology International Joint Research Laboratory of Magnetic Confinement Fusion and Plasma PhysicsSchool of Electrical and Electronic EngineeringHuazhong University of Science and TechnologyWuhan 430074People’s Republic of China National Key Laboratory of Science and Technology on Vacuum Technology and Physics Lanzhou Institute of PhysicsLanzhou 730000People’s Republic of China

The field-reversed configuration(FRC)plasma thruster driven by rotating magnetic field(RMF),abbreviated as the RMF-FRC thruster,is a new type of electric propulsion technology that is expected to accelerate the deep space *** experimental prototype,including diagnostic devices,was designed and constructed based on the principles of the RMF-FRC thruster,with an RMF frequency of 210 kHz and a maximum peak current of 2 *** the rated operating conditions,the initial plasma density was measured to be 5×10^(17)m^(-3),and increased to 2.2×10^(19)m^(-3)after the action of *** coupling efficiency of RMF was about 53%,and the plasma current reached 1.9 *** axial magnetic field changed in reverse by 155 Gauss,successfully reversing the bias magnetic field of 60 Gauss,which verifies the formation of FRC *** optimization research,it was found that when the bias magnetic field is 100 Gauss,the axial magnetic field reverse variation caused by FRC is the highest at 164 *** experimental results are discussed and strategies are proposed to improve the performance of the prototype.

关键词： rotating magnetic field(RMF) field-reversed configuration(FRC) plasma thrusters plasma current

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Interface compatibility between sulfide solid electrolytes and Ni-rich oxide cathode materials:Factors,modification,perspectives

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Journal of Energy Chemistry 2025年第2期101卷 233-262,I0006页

作者： Tianwen Yang Haijuan Pei Haijian Lv Shijie Lu Qi Liu Daobin Mu Beijing Key Laboratory of Environmental Science and Engineering School of Materials Science an EngineeringBeijing Institute of TechnologyBeijing 100081China State Key Laboratory of Space Power-Sources Technology Shanghai Institute of Space Power-SourcesShanghai 200245China

All-solid-state batteries(ASSBs)assembled with sulfide solid electrolytes(SSEs)and nickel(Ni)-rich oxide cathode materials are expected to achieve high energy density and safety,representing potential candidates for the next-generation energy storage ***,interfacial issues between SSEs and Nirich oxide cathode materials,attributed to space charge layer,interfacial side reactions,and mechanical contact failure,significantly restrict the performances of *** interface degradation is closely related to the components of the composite cathode and the process of electrode *** on the influencing factors of interface compatibility between SSEs and Ni-rich oxide cathode,this article systematically discusses how cathode active materials(CAMs),electrolytes,conductive additives,binders,and electrode fabrication impact the interface *** addition,the strategies for the compatibility modification are ***,the challenges and prospects of intensive research on the degradation and modification of the SSE/Ni-rich cathode material interface are *** review is intended to inspire the development of high-energy-density and high-safety all-solid-state batteries.

关键词： Sulfide solid electrolyte Ni-rich oxide cathode Interface compatibility Influencing factors All-solid-state batteries

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A Multi-faceted View of the X-Ray Spectral Variability in Seyfert Galaxy Ark 120

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Research in Astronomy and Astrophysics 2025年第1期25卷 228-239页

作者： Lu-Xin Ren Jun-Xian Wang Jia-Lai Kang CAS Key Laboratory for Research in Galaxies and Cosmology Department of AstronomyUniversity of Science and Technology of China School of Astronomy and Space Science University of Science and Technology of China

Utilizing a range of techniques including multi-band light curves,softness ratio analysis,structure functions,rms spectra,cross-correlation functions,and ratios of spectra from different intervals,we present a comprehensive study of the complex X-ray spectral variability in Seyfert 1 galaxy Ark 120,through re-analyzing its six XMM-Newton observations taken between 2003 and *** find a clear“softer-when-brighter”trend in the 2–10 ke V power-law component over long timescales,with this trend being timescale dependent,as it is much weaker on shorter timescales,similar to that previously detected in NGC ***,a rare“harder-when-brighter”trend is observed during one exposure,indicating dynamic changes in the spectral variability behavior of the power-law *** exceptional exposure,with the spectral variability indeed marked by a power-law pivoting at an unusually low energy of～2 ke V,suggests intricate variations in the thermal Comptonization processes within the ***,when the data below 2 ke V are included,we identify that the soft excess component adds significant complexity to the spectral variability,such as evidenced by a transition from“harder-when-brighter”to“softer-when-brighter”during another single *** extra complexity arises because the variability of the soft excess sometimes follows and sometimes does not follow the changes in the power-law *** findings underscore the necessity of applying multiple analytic techniques to fully capture the multifaceted spectral variability of AGNs.

关键词： galaxies:active galaxies:Seyfert X-rays:galaxies

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