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Experimental and numerical simulation study of the effect for the anode positions on the discharge characteristics of 300W class low power Hall thrusters

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Plasma science and technology 2023年第1期25卷 100-110页

作者：陈新伟高俊杨三祥耿海郭宁顾左杨俊泰张宏 Science and Technology on Vacuum Technology and Physics Laboratory Lanzhou Institute of PhysicsLanzhou 730000People's Republic of China

Low-power Hall thruster(LHT) generally has poor discharge efficiency characteristics due to the large surface-to-volume *** to further refine and improve the performance of 300 W class LHT in terms of thrust and efficiency,and to obtain the most optimal operating point,the experimental study of the discharge characteristics for three different anode positions was conducted under the operation of various discharge voltages(100-400 V) and anode mass flow rates(0.65 mg·s-1and 0.95 mg·s-1).The experimental results indicated that the thruster has the most excellent performance in terms of thrust and efficiency etc at a channel length of 27 mm for identical operating *** addition,particle in cell simulations,employed to reveal the underlying physical mechanisms,show that the ionization and acceleration zone is pushed downwards towards the channel exit as the anode moves towards the *** the identical operating point,when the channel length is reduced from 32 to 27 mm,the ionization and acceleration zone moves towards the exit,and the parameters such as thrust and efficiency increase due to the high ionization rate,ion number density,and axial electric *** the channel length is further moved to 24 mm,the parameters in terms of thrust(F) and efficiency(ηa) are reduced as a result of the decreasing ionization efficiency(ηm) and the larger plume divergence angle(α).In this paper,the results indicated that an optimum anode position(ΔL=27 mm) exists for the optimum performance.

关键词： low-power Hall thruster discharge characteristics PIC-MCC simulation anode positions

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Study of beam divergence and thrust vector eccentricity characteristics of the Hall thruster based on dual Faraday probe array planes and its applications

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Plasma science and technology 2023年第5期25卷 104-115页

作者：陈新伟赵勇田恺高俊孙明明孙新锋郭宁张宏王尚民冯杰陈焘耿海杨俊泰史楷 Science and Technology on Vacuum Technology and Physics Laboratory Lanzhou Institute of PhysicsLanzhou 730000People’s Republic of China

The accurate knowledge of the thrust vector eccentricity and beam divergence characteristics of Hall thrusters are of significant engineering value for the beneficial integration and successful application of Hall thrusters on *** the characteristics of the plume bipolar diffusion due to the annular discharge channel of the Hall thruster,a Gaussian-fitted method for thrust vector deviation angle and beam divergence of Hall thrusters based on dual Faraday probe array planes was proposed in respect of the Hall thruster beam *** results show that the ratios of the deviation between the maximum and minimum values of the beam divergence angle and the thrust vector eccentricity angle using a Gaussian fit to the optimized Faraday probe dual plane to the mean value are 1.4%and 11.5%,*** optimized thrust vector eccentricity angle obtained has been substantially improved,by approximately 20%.The beam divergence angle calculated using a Gaussian fitting to the optimized Faraday probe dual plane is approximately identical to the non-optimized *** beam divergence and thrust vector eccentricity angles for different anode mass flow rates were obtained by averaging the beam divergence and thrust vector eccentricity angles calculated by the dual-plane,Gaussian-fitted ion current density method for different *** study not only allows for an immediate and effective tool for determining the design of thrust vector adjustment mechanisms of spacecraft with different power Hall thrusters but also for characterizing the 3D spatial distribution of the Hall thruster plume.

关键词： Hall thruster beam divergence thrust vector eccentricity dual Faraday probe array planes

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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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Analysis of the Laser Welding technology Scheme for the Lock Bottom Structure of a Titanium Alloy Aerospace Pressure Vessel

Analysis of the Laser Welding Technology Scheme for the Lock...

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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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Numerical study on THz radiation of two-dimensional plasmon resonance of GaN HEMT array

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Chinese physics B 2023年第4期32卷 268-276页

作者：郭宏阳张平杨生鹏王少萌宫玉彬 National Key Laboratory of Science and Technology on Vacuum Electronics University of Electronic Science and Technology of ChinaChengdu 610031China

The Ga N high electron mobility transistor(HEMT)has been considered as a potential terahertz(THz)radiation source,yet the low radiation power level restricts their *** HEMT array is thought to improve the coupling efficiency between two-dimensional(2D)plasmons and THz *** this work,we investigate the plasma oscillation,electromagnetic radiation,and the integration characteristics of Ga N HEMT targeting at a high THz radiation power *** quantitative radiation power and directivity are obtained for integrated Ga N HEMT array with different array periods and element *** the same initial plasma oscillation phase among the HEMT units,the radiation power of the two-element HEMT array can achieve 4 times as the single HEMT radiation power when the array period is shorter than 1/8electromagnetic *** addition,the radiation power of the HEMT array varies almost linearly with the element number,the smaller array period can lead to the greater radiation *** shows that increasing the array period could narrow the main radiated lobe width while weaken the radiation *** the element number can improve both the radiation directivity and *** also synchronize the plasma wave phases in the HEMT array by adopting an external Gaussian plane wave with central frequency the same as the plasmon resonant frequency,which solves the problem of the radiation power reduction caused by the asynchronous plasma oscillation phases among the *** study of the radiation power amplification of the one-dimensional(1D)Ga N HEMT array provides useful guidance for the research of compact high-power solid-state terahertz sources.

关键词： GaN HEMT array two-dimensional(2D)plasmons THz emission

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Gas pressure measurement using spatial heterodyne spectroscopy 15

Gas pressure measurement using spatial heterodyne spectrosco...

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15th International Conference on Information Optics and Photonics, CIOP 2024

作者： Zhang, Yafei Dong, Meng Jia, Wenjie Cheng, Yongjun Science and Technology on Vacuum Technology and Physics Laboratory Lanzhou Institute of Physics Lanzhou730000 China

ISBN: (数字)9781510686175

ISBN: (纸本)9781510686168

With the quantization of traditional metrology standards, quantum vacuum metrology based on optical methods has been developed. In this paper, a new method of measuring gas pressure is proposed by combining quantum vacuum metrology technology based on optical interferometry and spatial heterodyne spectroscopy. The two arms of the SHS are closed as a gas chamber. In the chamber, refractivity change caused by gas pressure will change the OPD distribution on image plane. Through OPD analysis, the theoretical expression of interference fringes including the effect of refractive index was obtained. And then numerical simulations were performed, in which the changes of Littrow wavelength, fringe period and phase when the air pressure changed from 0 to 1 ATM were 0.17 nm, 6.21 periods and 19.50 rad. Subsequent ray tracing simulations further validated the measurement theory of this paper. © 2024 SPIE.

关键词： Velocity measurement

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Electromagnetic technology for vacuum Metrology in the Typical Development of a Metrological-Grade Spinning Rotor Gauge

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Electromagnetic science 2023年第3期1卷 88-99页

作者： Detian Li Meiru Guo Zhenhua Xi Huzhong Zhang Bowen Li Science and Technology on Vacuum Technology and Physics Laboratory Lanzhou Institute of PhysicsLanzhou 730000China

As the most precise viscous vacuum gauge,the spinning rotor gauge is widely used in the aerospace,nuclear,semiconductor,and other fields because of its excellent accuracy and chemical ***,a metrological-grade spinning rotor vacuum gauge is developed,and its performance is *** can be used for international comparison of vacuum standards and construction of national vacuum measurement traceability and transmission *** paper presents the design of a single-degree-of-freedom permanent magnet-biased rotor suspension system,a high-speed rotary stepper drive system,a rotational angular velocity determination system,a lateral damping system,and a transducer in *** change in residual drag is less than 0.49%after 50 minutes of *** is good consistency and linearity in the range of 9.1727×10^(−5)Pa to 1.2081 Pa.

关键词： Magnetically levitated rotor vacuum metrology Transfer standard Viscous vacuum gauge

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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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