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2024 International Conference Optoelectronic Information and Optical Engineering, OIOE 2024

作者： Ma, Yanlong Zhao, Jipeng Yang, Wenbo Ma, Tianju Gu, Sendong Li, Lifeng Yu, Bin Tang, Xiaoyan Science and Technology on Vacuum Technology and Physics Laboratory Lanzhou Institute of Physics Lanzhou730000 China

ISBN: (数字)9781510688209

ISBN: (纸本)9781510688193

The laser welding plan for a lock bottom construction is suggested in order to meet the development needs of high-quality, high-efficiency, and high-reliability aerospace pressure vessels. The weld porosity issue comes next. In this paper, by introducing the inhibition state of titanium alloy porosity, laser welding technology and the influence of process parameters on porosity, the laser welding scheme of lock bottom structure is compared and analyzed. © 2025 SPIE.

关键词： Titanium alloys

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Finite Element Analysis and Experimental Verification of Pure Titanium Spherical Metal Diaphragm

Finite Element Analysis and Experimental Verification of Pur...

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2024 International Conference Optoelectronic Information and Optical Engineering, OIOE 2024

作者： Li, Ganggang Ma, Yanlong Li, Lifeng Zhao, Jipeng Ma, Tianju Hou, Yanhui Li, Zheng Science and Technology on Vacuum Technology and Physics Laboratory Lanzhou Institute of Physics Lanzhou730000 China

ISBN: (数字)9781510688209

ISBN: (纸本)9781510688193

A vital component of a metal diaphragm tank is the metal diaphragm. Numerous elements, including the material's composition, exterior measurements, diaphragm thickness, and connection border, influence how well it emits emissions. Therefore, in order to examine the attitude and pressure difference during the diaphragm flipping process, a numerical simulation must be done at the beginning of the design. The flip test of the diaphragm shows that the test results are in good agreement with the simulation analysis. Therefore, the spherical metal diaphragm can be simulated instead of the flip test before being applied to the product. © 2025 SPIE.

关键词： Tanks (containers)

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Cracking Analysis of the TC4 Aerospace Pressure Vessel Electron Beam Weld

Cracking Analysis of the TC4 Aerospace Pressure Vessel Elect...

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2024 International Conference Optoelectronic Information and Optical Engineering, OIOE 2024

作者： Hou, Yanhui Ma, Yanlong Yang, Wenbo Gu, Sendong Zhao, Jipeng Ma, Tianju Li, Ganggang Li, Lifeng Wang, Yalong Science and Technology on Vacuum Technology and Physics Laboratory Lanzhou Institute of Physics Lanzhou730000 China

ISBN: (数字)9781510688209

ISBN: (纸本)9781510688193

The cracking problem of common electron beam welds in TC4 pressure vessels for satellites was analyzed. The metallographic structure and micro-fracture characteristics of the welds were studied. The microhardness, oxygen, and hydrogen contents of the welds were measured. The causes of the cracking of electron beam welds in TC4 pressure vessels were determined by comprehensive analysis. The results show that during the welding process, stainless steel spatters are integrated into the weld area, resulting in high hardness, brittleness, and poor deformation ability in the weld area. In addition, the loose defects in the weld area further reduce the bearing capacity of the weld, resulting in low-pressure brittle cracking in the middle of the weld during the gas cylinder blasting test. © 2025 SPIE.

关键词： Gas cylinders

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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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Experimental realization of Wheeler's delayed-choice experiment with dual selections

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science China(physics,Mechanics & Astronomy) 2025年第5期Mechanics & Astronomy) .卷 48-54页

作者： Xiaowan Yang Xinglei Yu Liangsheng Li Xinzhi Zhao Tianle Zheng Chengjie Zhang Chuan-Feng Li Guang-Can Guo School of Physical Science and Technology Ningbo University National Key Laboratory of Scattering and Radiation Hefei National Laboratory University of Science and Technology of China CAS Key Laboratory of Quantum Information University of Science and Technology of China CAS Center for Excellence in Quantum Information and Quantum Physics University of Science and Technology of China

Wheeler's delayed-choice experiment demonstrates wave-particle duality of particles using different experimental configurations of a Mach-Zehnder interferometer. In a quantum version of this experiment, the wave-particle behaviour of photons can be observed by controlling presence or absence of the second beam splitter. Here, we implement a delayed-choice experiment with dual selections based on entangled photons, experimentally controlling both of two beam splitters in the Mach-Zehnder interferometer, where the presence and absence of the second beam splitter are simultaneously controlled through path encoding. Our experiment reveals the wave-particle behavior of single photons under different configurations of two beam splitters. We further discuss the scenario when two beam splitters are in a quantum superposition of being present and absent, photons will be in a wave-particle quantum superposition state.

关键词： delayed choice quantum entanglement wave-particle duality

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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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A 200 W 92-98 GHz Continuous Wave Traveling Wave Tube

IEEE Electron Device Letters

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IEEE Electron Device Letters 2025年第5期46卷 856-859页

作者： Yuan, Mengjie Wang, Xinyang Lai, Han Du, Hang Duan, Zhaoyun Lu, Zhigang Wang, Zhanliang Gong, Yubin Gong, Huarong University of Electronic Science and Technology of China National Key Laboratory of Science and Technology on Vacuum Electronics School of Electronic Science and Engineering Chengdu611731 China

In this letter, a 200 W 92-98 GHz continuous wave (CW) traveling wave tube (TWT) is designed. The electron gun generates a beam current of 173 mA at a beam voltage of 21.75 kV and the beam fill factor is 0.64. The fluctuation radius of the electron beam is less than 0.2 mm under the effect of a periodic permanent magnet (PPM) focusing system with a peak magnetic field of 0.51 T. The slow wave structure (SWS) uses a non-circular bent folded waveguide (FWG) structure with large beam tunnel to obtain high beam transmission rate. The high frequency system adopts a three-stage design to effectively suppress oscillations. Additionally, phase velocity tapering technology is integrated into the tube design to enhance electronic efficiency. The experimental results demonstrate that, at a transmission rate of 99.1%, the TWT achieves a maximum output power of 54.2 dBm at 94 GHz, with a corresponding gain of 42.4 dB. The proposed design significantly enhances electronic efficiency, suppresses oscillations, and considerably increases output power. © 1980-2012 IEEE.

关键词： Slow wave structures

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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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Electronic thermal conductivity of tungsten-based systems during collision cascade processes

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Nuclear science and Techniques 2025年第5期36卷 167-176页

作者： Jiong-Rong Wang Bi-Cai Pan Key Laboratory of Strongly-Coupled Quantum Matter Physics Department of PhysicsUniversity of Science and Technology of ChinaHefei 230026China Hefei National Laboratory for Physical Sciences at Microscale University of Science and Technology of ChinaHefei 230026China

The thermal conductivity of plasma-facing materials(PFM)exposed to intense radiation is a critical concern for the reliable usage of materials in fusion ***,limited research has been performed regarding the thermal conductivity of structures that rapidly change in a short time during collision cascade processes under *** this study,we employed the tight-binding(TB)method to investigate the electronic thermal conductivity(κ_(e))of tungsten-based systems during various cascading *** found thatκ_(e) values sharply decrease within the initial 0.3 picoseconds and then partially recover at a slow pace;this is closely linked to the evolution of defects and microstructural *** increase in the initial kinetic energy of the primary knock-on atom and the presence of a high concentration of hydrogen atoms further decrease theκ_(e) ***,higher temperatures have a significant positive effect onκ_(e).Furthermore,the presence of a grain boundary∑5[001](130)substantially reducesκ_(e),whereas the absorption effect of point defects by the grain boundary has little influence onκ_(e) during *** findings provide a theoretical basis for evaluating changes in the thermal conductivity performance of PFMs during their usage in nuclear fusion reactors.

关键词： Electronic thermal conductivity Collision cascade Tungsten Plasma-facing materials Tight-binding calculations

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Thermodynamic and experimental evaluation of the sustainable recycling of magnesium alloy scrap by vacuum distillation based on vapor-liquid equilibrium

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Journal of Magnesium and Alloys 2025年第1期13卷 283-295页

作者： Lipeng Wang Dong Liang Yang Tian Jianxue Chai Rui Li Shuji Wu Bin Yang Baoqiang Xu Yong Deng Key Laboratory for Nonferrous Vacuum Metallurgy of Yunnan Province Kunming University of Science and TechnologyKunmingChina State Key Laboratory of Complex Non-ferrous Metal Resources Clean Utilization Kunming University of Science and TechnologyKunmingChina Engineering Research Center of Aluminum Industry of Yunnan Province Kunming University of Science and TechnologyKunmingChina National Engineering Research Center of Vacuum Metallurgy Kunming University of Science and TechnologyKunmingChina Faculty of Metallurgical and Energy Engineering Kunming University of Science and TechnologyKunmingChina Shanxi Regal Advanced Material Co. Ltd.Yuncheng CityChina

Magnesium(Mg)alloys are widely used lightweight structural materials for automobiles and help reduce carbon ***,their use increases the production of Mg alloy scrap,which is recycled at a much lower rate than aluminum,and its greater complexity poses challenges to existing recycling *** vacuum distillation can be used to recycle Mg alloy scrap,this requires optimizing and maximizing metal recirculation,but there has been no thermodynamic analysis of this *** this study,the feasibility and controllability of separating inclusions and 23 metal impurities were evaluated,and their distribution and removal limits were *** analyses and experimental results showed that inclusions and impurity metals of separation coefficient lgβ_(i)≤-5,including Cu,Fe,Co,and Ni below 0.001 ppm,could be removed from the *** Zn entered the recycled Mg,while impurities with-1vacuum distillation recycling:lower temperatures and higher system pressures for Zn separation in the early stage,and the early termination of the recovery process in the later stage or a continuous supply of raw melt can also prevent contamination during *** alloying elements Al and Zn in Mg alloy scrap can be further recovered and purified by vacuum distillation when economically feasible,to maximize the recycling of metal resources.

关键词： Magnesium alloy Scrap recycling Thermodynamic analysis Impurity removal vacuum distillation

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