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Plasma transport simulation under different conditions and optimization analysis of dual-stage grid ion thruster

Chinese Journal of Aeronautics 2023年第7期36卷 388-399页

作者： Yajie HAN Guangqing XIA Bin SUN Chang LU Junjun ZHANG vladimir a.saetchnikov State Key Laboratory of Structural Analysis Optimization and CAE Software for Industrial EquipmentDalian University of TechnologyDalian 116024China Key Laboratory of Advanced Technology for Aerospace Vehicles of Liaoning Province Dalian University of TechnologyDalian 116024China Collaborative Innovation Center of Micro&Nano Satellites of Hebei Province North China Institute of Aerospace EngineeringLangfang 065000China Physics and Aerospace Technology Department Belarusian State UniversityMinsk 220030Belarus

In order to study the extraction and acceleration mechanism of the dual-stage grid,a three-dimensional model based on the Particle-In-Cell/Monte Carlo Collision(PIC/MCC)method is ***-stage grid ion thruster is a new type of electrostatic ion thruster,which can break through the limitations of traditional gridded ion thrusters,and greatly improve the specific *** high performance also makes the grid sensitive to operating *** this paper,the influence of grid parameters on xenon ion thruster’s performance in a wide range is systematically simulated,and the optimal operating condition is *** the over-focusing of the plume,and the transparency of the screen grid are improved,and the grid corrosion is reduced through simulation *** specific impulse under the given working conditions is 9877.24 s and the thrust is 7.28 *** on the simulation optimization,the limitation of the dual-stage grid is *** grid performs well under high voltage conditions(>3000 V)but not well under low voltage conditions(<2000 V).Finally,since argon is cheaper and more advantageous in future engineering applications,the plasma distribution and grid extraction ability under xenon and argon are analyzed and compared to study the flexibility of the dual-stage grid ion *** simulation results show that a set of optimal parameters is only applicable to the corresponding propellant,which needs to be optimized for different propellant types.

关键词： 3D modeling Dual-stage grid Ion thruster PIC/MCC method Plasma simulation

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Ion thruster accelerator grid erosion mechanism under extreme conditions of cylindrical erosion and chamfer erosion

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Chinese Journal of Aeronautics 2023年第6期36卷 128-139页

作者： Guangqing XIA Jiahui LI Chang LU Hai GENG vladimir a.saetchnikov Juan LI Yanlong WANG State Key Laboratory of Structural Analysis Optimization and CAE Software for Industrial EquipmentDalian University of TechnologyDalian 116024China Key Laboratory of Advanced Technology for Aerospace Vehicles of Liaoning Province Dalian University of TechnologyDalian 116024China Collaborative Innovation Center of Micro&Nano Satellites of Hebei Province North China Institute of Aerospace EngineeringLangfang 065000China Science and Technology on Vacuum Technology and Physics Laboratory Lanzhou Institute of PhysicsLanzhou 73000China Physics and Aerospace Technology Department Belarusian State UniversityMinsk 220030Belarus

In this paper,the abnormal experimental phenomenon on barrel erosion under extreme working conditions in the ultra-long life experiment(>10000 h)of ion thruster ion optics is studied by the Immersed-Finite-Element Particle-In-Cell Monte-Carlo-Collision(IFE-PIC-MCC)method and the grid erosion evaluation *** transport process of beam ions and Charge Exchange(CEX)ions in the grid system,and the characteristics and mechanisms of the aperture barrel erosion under extreme erosion conditions(*** cylindrical erosion and chamfer erosion)were systematically *** to the advantage of the IFE method for dealing with complex boundaries in structured mesh,the aperture barrel erosion morphology of the accelerator grid is reconstructed accurately based on the experimental *** results show that,with the evolution of working conditions,the mechanism of the aperture barrel erosion changes significantly,which relies heavily on the accelerator grid *** change of the accelerator grid aperture barrel morphology has a significant effect on the behavior of CEX ions,and only affects the local electric field distribution,but has no effect on the upstream plasma *** the erosion progresses,the erosion position moves downstream along the grid aperture axis direction,and the erosion range becomes *** of the erosion phase,the erosion rate of the CEX ions located downstream of the decelerator grid is the *** erosion rate is related to the mean incident energy and angle,and their variation is closely related to the position and trajectory of CEXions.

关键词： Accelerator grid Charge Exchange(CEX)ions Erosion IFE-PIC-MCC Ion propulsion

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Detection of per-and polyfluoroalkyl water contaminants with a multiplexed 4D microcavities sensor

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Photonics Research 2023年第11期11卷 I0025-I0033页

作者： ANTON V.saetchnikov ELINA A.TCHERNIAVSKAIA vladimir a.saetchnikov ANDREAS OSTENDORF Chair of Applied Laser Technologies Ruhr University Bochum44801 BochumGermany Physics Department Belarusian State University220030 MinskBelarus Radio Physics Department Belarusian State University220064 MinskBelarus

The per-and polyfluoroalkyl substances(PFAS)are a group of organofluorine chemicals treated as the emerging pollutants that are currently of particularly acute *** compounds have been employed intensively as surfactants over multiple decades and are already to be found in surface and ground waters at amounts sufficient to have an effect on human health and *** of the carbon–fluorine bonds,the PFAS have an extreme environmental persistence and their negative impact accumulates with further production and penetration into the *** Germany alone,more than thousands of sites have been identified as contaminated with PFAS;thus,timely detection of PFAS residue is becoming a high *** this paper,we report on the high performance optical detection method based on whispering gallery mode(WGM)microcavities applied for the first time to detect PFAS contaminants in aqueous solutions.A self-sensing boosted 4D microcavity fabricated with two-photon polymerization is employed as an individual sensing *** an example of the multiplexed imaging sensor with multiple hundreds of simultaneously interrogated microcavities we demonstrate the possibility to detect the PFAS chemicals representatives at a level down to 1 ppb(parts per billion).

关键词： fluorine hundreds becoming

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Deep‐learning powered whispering gallery mode sensor based on multiplexed imaging at fixed frequency

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Opto-Electronic Advances 2020年第11期3卷 1-9页

作者： Anton V.saetchnikov Elina A.Tcherniavskaia vladimir a.saetchnikov Andreas Ostendorf Applied Laser Technologies Ruhr University BochumBochum 44801Germany Radio Physics Department Belarusian State UniversityMinsk 220064Belarus Physics Department Belarusian State UniversityMinsk 220030Belarus

During the last decades the whispering gallery mode based sensors have become a prominent solution for label-free sensing of various physical and chemical *** the same time,the widespread utilization of the approach is hindered by the restricted applicability of the known configurations for ambient variations quantification outside the laboratory conditions and their low affordability,where necessity on the spectrally-resolved data collection is among the main limiting *** this paper we demonstrate the first realization of an affordable whispering gallery mode sensor powered by deep learning and multi-resonator imaging at a fixed *** has been shown that the approach enables refractive index unit(RIU)prediction with an absolute error at 3×10^(-6) level for dynamic range of the RIU variations from 0 to 2×10^(-3) with temporal resolution of several milliseconds and instrument-driven detection limit of 3×10−*** sensing accuracy together with instrumental affordability and production simplicity places the reported detector among the most cost-effective realizations of the whispering gallery mode *** proposed solution is expected to have a great impact on the shift of the whole sensing paradigm away from the model-based and to the flexible self-learning solutions.

关键词： optical microresonator sensing machine learning whispering gallery mode multiplexing

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