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24th International vacuum Electronics Conference, IVEC 2023

作者： Ren, Zhengyi Guo, Meiru Yang, Zhe Li, Gang Geng, Jian Cheng, Yongjun Lanzhou Institute of Physics Science and Technology on Vacuum Technology and Physics Laboratory Lanzhou China

ISBN: (纸本)9781665473217

In recent years, miniature mass spectrometer (MS) play an important role in the space exploration and environmental monitoring fields. In this paper, A miniature Mattauch-Herzog double focusing mass spectrometer is developed for mass analysis. The software SIMION8.1 is mainly used to study the fringing field of the magnetic analyzer where the magnetic flux density is 0.85T. From that, we know the distribution of the fringing field can be greatly compressed by adding ideal magnetic shielding material at the entrance of the magnetic analyzer. Besides, the experiment shows the instrument has a good performance and the mass resolution of He is 39.643. © 2023 IEEE.

关键词： Mass spectrometers

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Research on high-resolution displacement detection technology in space 24

Research on high-resolution displacement detection technolog...

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24th International vacuum Electronics Conference, IVEC 2023

作者： Xu, Hengtong Li, Detian Lei, Jungang Tao, Wenze Li, Yunpeng Lanzhou Institute of Physics Science and Technology on Vacuum Technology and Physics Laboratory Lanzhou China

ISBN: (纸本)9781665473217

In this paper, we introduce a developed high-precision displacement detector in space. It consists of two main parts, a capacitive type sensor and a displacement detection circuit system. Among them, the displacement detection circuit system consists of three main parts: the carrier signal source, the high-precision displacement detector, and the external power supply of the detector. The results show that the gain of the displacement detector is 7.129×105V/m, and the resolution of the displacement can reach 6.84×10-12m/Hz0.5 at low frequency and 2. 74 × 10-12m/Hz0.5at high frequency in the range of 5mHz∼ 1Hz. © 2023 IEEE.

关键词： Capacitive sensors

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A field emission performance testing device with adjustable electrode spacing 24

A field emission performance testing device with adjustable ...

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24th International vacuum Electronics Conference, IVEC 2023

作者： Pei, Xiaoqiang Cheng, Yongjun Sun, Wenjun Wu, Chengyao Ding, Dong Lanzhou Institute of Physics Science and Technology on Vacuum Technology and Physics Laboratory Lanzhou China

ISBN: (纸本)9781665473217

This work presents a device that can adjust electrode spacing inside a vacuum system to evaluate the field emission characteristics of the carbon nanotube array cathode grown on a stainless steel substrate. It was made by coaxial connection of the rear end of a screw micrometer, which acts as the anode, with a stepper motor. The distance between the anode and the cathode was controlled by altering the pitch of the stepper motor with an angle precision of 1 degree. Therefore, the electrode separation can be tuned in the range of 0∼15mm, at 1.388 μm incremental steps. Comparing with devices with a fixed electrode spacing, the advantage is that this device allows continuous regulation of the electrode spacing after it is placed in a vacuum system to test the emission properties under various electrical parameters in one process thus avoiding repeated breaking of the vacuum environment. Therefore, test efficiency is improved, hence saving manpower, material resources, testing time and greatly reducing the cost of experimentation. This device is simple in structure and relatively easy to prepare. © 2023 IEEE.

关键词： Anodes

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The development of a miniature double focusing mass spectrometer 24

The development of a miniature double focusing mass spectrom...

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24th International vacuum Electronics Conference, IVEC 2023

作者： Yang, Zhe Li, Detian Ren, Zhengyi Guo, Meiru Geng, Jian Cheng, Yongjun Lanzhou Institute of Physics Science and Technology on Vacuum Technology and Physics Laboratory Lanzhou China

ISBN: (纸本)9781665473217

In this paper, a developed miniature Mattauch-Herzog mass spectrometer for space exploration is introduced. The instrument is mainly composed of electron ionization source, electrostatic and magnetic analyzer, focal plane detector, which ionizes substances and measures the intensities of various ion spectral peaks. The 90 magnetic analyzer with asymmetric structure is employed where the magnetic flux density is 0.25T. According to the experiment, the width of H2 at 50% peak height (FWHM) is 0.0875amu which is less than 0.1amu, that is to say, the resolution capability of the instrument meets the design requirements. Besides, the sensitivity of H2 is 3.298× 105V}/Pa and the minimum detectable partial pressure of H2 is 3.153 × 10-7Pa. © 2023 IEEE.

关键词： Space research

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Simulation and experimental study on secondary electron emission of magnesium oxide under electron incident 24

Simulation and experimental study on secondary electron emis...

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24th International vacuum Electronics Conference, IVEC 2023

作者： Guo, Lei Shi, Chunke He, Yilei Wang, Duoshu Lanzhou Institute of Physics Science and Technology on Vacuum Technology and Physics Laboratory Lanzhou730000 China

ISBN: (纸本)9781665473217

The trajectory of electrons in magnesium oxide was simulated based on Dekker model, and the calculation model of the SEY was established according to the motion law of electrons in magnesium oxide. The influence law of different film thickness on the SEY was calculated and analyzed. The simulation results show that the maximum SEY of magnesium oxide is between 12.0-12.5 at the incident electron energy between 800eV and 1000eV. The SEY reaches its maximum at the thickness of film about 70-90nm. The variation trend of the simulation results and the experimental data is basically the same. The experimental test results show that the maximum SEY is about 9.5-10.2 at the incident electron energy between 400eV and 600eV. The maximum SEY is obtained at the thickness of film about 55-70nm. The above results can provide guidance for the preparation of high SEY magnesium oxide film. © 2023 IEEE.

关键词： Magnesia

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Wide-range characteristics of beam perveance and saddle point potential of LIPS-200 ion thruster

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Plasma science and technology 2022年第11期24卷 85-92页

作者： Xueer ZHANG Tianping ZHANG Detian LI Juanjuan CHEN Yanhui JIA Science and Technology on Vacuum Technology and Physics Laboratory Key Laboratory of Space Electric Propulsion Technology of Gansu ProvinceLanzhou Institute of PhysicsLanzhou 730000People’s Republic of China

Both the long-life and multi-mode versions of LIPS-200 ion thruster are under investigation in LIP(Lanzhou Institute of physics).To confirm the feasible ranges of the beam current and accel(abbreviation for accelaration)grid potential to apply to the thruster,the wide-range beam perveance(the state of beam focus)and saddle point potential(the lowest potential along beamlet centerline)characteristics of LIPS-200 are studied with a test-verified PIC-MCC(Particle in Cell-Monte Carlo Collisions)*** characteristics are investigated with both the initial and the eroded states of the accel grid aperture *** results show that the feasible ranges of these parameters with respect to perveance/crossover(overfocused)limit extend as the operating time accumulates,while the feasible range of accel grid potential narrows due to a reduced EBSF(electron backstreaming failure)*** feasible ranges determined by the initial condition are:(i)the beam current up to 0.981 A,and(ii)the accel grid potential up to−85 V.A 23%enlargement of the aperture diameter would bring up to 48 V of EBSF margin loss.

关键词： ion thruster perveance limit crossover limit saddle point potential parameter range

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Future application and prospect of space electron beam processing technology 3

Future application and prospect of space electron beam proce...

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2023 3rd International Conference on Mechatronics technology and Aerospace Engineering, ICMTAE 2023

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

Technological advances in space electron beam processing could fundamentally alter how spacecraft and space stations are built. The primary topics covered in this essay are the application circumstances for electron beams in space, the research situations for electron beam welding, additive manufacturing, and surface modification, and an analysis of the potential future applications for this technology. It demonstrates the viability of space applications of electron beam processing technologies. © Published under licence by IOP Publishing Ltd.

关键词： Electron beams

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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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Effects of the initiation position on the damage and fracture characteristics of linear-charge blasting in rock

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International Journal of Minerals,Metallurgy and Materials 2024年第3期31卷 443-451页

作者： Chenxi Ding Renshu Yang Xiao Guo Zhe Sui Chenglong Xiao Liyun Yang School of Civil and Resource Engineering University of Science and Technology BeijingBeijing 100083China School of Mechanics and Civil Engineering China University of Mining and Technology(Beijing)Beijing 100083China School of Mathematics and Physics University of Science and Technology BeijingBeijing 100083China State Key Lab of Explosion Science and Technology Beijing Institute of TechnologyBeijing 100081China

To study the effects of the initiation position on the damage and fracture characteristics of linear-charge blasting, blasting model experiments were conducted in this study using computed tomography scanning and three-dimensional reconstruction methods. The fractal damage theory was used to quantify the crack distribution and damage degree of sandstone specimens after blasting. The results showed that regardless of an inverse or top initiation, due to compression deformation and sliding frictional resistance, the plugging medium of the borehole is effective. The energy of the explosive gas near the top of the borehole is consumed. This affects the effective crushing of rocks near the top of the borehole, where the extent of damage to Sections Ⅰ and Ⅱ is less than that of Sections Ⅲ and Ⅳ. In addition, the analysis revealed that under conditions of top initiation, the reflected tensile damage of the rock at the free face of the top of the borehole and the compression deformation of the plug and friction consume more blasting energy, resulting in lower blasting energy efficiency for top initiation. As a result, the overall damage degree of the specimens in the top-initiation group was significantly smaller than that in the inverse-initiation group. Under conditions of inverse initiation, the blasting energy efficiency is greater, causing the specimen to experience greater damage. Therefore, in the engineering practice of rock tunnel cut blasting, to utilize blasting energy effectively and enhance the effects of rock fragmentation, using the inverse-initiation method is recommended. In addition, in three-dimensional(3D) rock blasting, the bottom of the borehole has obvious end effects under the conditions of inverse initiation, and the crack distribution at the bottom of the borehole is trumpet-shaped. The occurrence of an end effect in the 3D linear-charge blasting model experiment is related to the initiation position and the blocking condition.

关键词： blasting linear charge initiation position computed tomography three-dimensional reconstruction damage

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Heteronuclear Magnetisms with Ultracold Spinor Bosonic Gases in Optical Lattices

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Chinese physics Letters 2024年第2期41卷 69-82页

作者： Yongqiang Li Chengkun Xing Ming Gong Guangcan Guo Jianmin Yuan Department of Physics National University of Defense TechnologyChangsha 410073China Hunan Key Laboratory of Extreme Matter and Applications National University of Defense TechnologyChangsha 410073China Key Lab of Quantum Information(CAS) University of Science and Technology of ChinaHefei 230026China CAS Key Laboratory of Quantum Information University of Science and Technology of ChinaHefei 230026China Synergetic Innovation Center of Quantum Information and Quantum Physics University of Science and Technology of ChinaHefei 230026China Hefei National Laboratory University of Science and Technology of ChinaHefei 230088China Department of Physics Graduate School of China Academy of Engineering PhysicsBeijing 100193China

Motivated by recent realizations of spin-1 NaRb mixtures in the experiments[***.114,255301(2015);***.128,223201(2022)],we investigate heteronuclear magnetism in the Mott-insulating *** from the identical mixtures where the boson statistics only admits even parity states from angular momentum composition,for heteronuclear atoms in principle all angular momentum states are allowed,which can give rise to new magnetic *** various magnetic phases can be developed over these degenerate spaces,the concrete symmetry breaking phases depend on not only the degree of degeneracy but also the competitions from many-body *** unveil these rich phases using the bosonic dynamical mean-field theory *** phases are characterized by various orders,including spontaneous magnetization order,spin magnitude order,singlet pairing order,and nematic order,which may coexist specially in the regime with odd *** we address the possible parameter regimes for observing these spin-ordered Mott phases.

关键词： parity momentum allowed

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