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Conceptual design of Dipole Research Experiment(DREX)

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Plasma Science and Technology 2017年第3期19卷 62-68页

作者： Qingmei xiao Zhibin WANG xiaogang WANG chijie xiao XiaQyi YANG Jinxing ZHENG Laboratory for Space Environment and Physical Sciences Harbin Institute of Technology Harbin 150001 People's Republic of China Department of Physics Harbin Institute of Technology Harbin 150001 People's Republic of China State Key Lab of Nuclear Physics & Technology and School of Physics Peking University Beijing 100871 People's Republic of China Institute of Plasma Physics Chinese Academy of Sciences Hefei 230031 People's Republic of China

A new terrella-like device for laboratory simulation of inner magnetosphere plasmas,Dipole Research Experiment,is scheduled to be built at the Harbin Institute of Technology（HIT）,China,as a major state scientific research facility for space physics *** is designed to provide a ground experimental platform to reproduce the inner magnetosphere to simulate the processes of trapping,acceleration,and transport of energetic charged particles restrained in a dipole magnetic field *** scaling relation of hydromagnetism between the laboratory plasma of the device and the geomagnetosphere plasma is applied to resemble geospace processes in the Dipole Research Experiment *** plasma sources,different kinds of coils with specific functions,and advanced diagnostics are designed to be equipped in the facility for *** motivation,design criteria for the Dipole Research Experiment experiments and the means applied to generate the plasma of desired parameters in the laboratory are also described.

关键词： DREX SPERF dipole magnetosphere radiation belt

Effects of magnetic field on electron power absorption in helicon fluid simulation

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Plasma Science and Technology 2021年第8期23卷 29-37页

作者： Mingyang WU chijie xiao Yue LIU xiaoyi YANG xiaogang WANG Chang TAN Qi SUN State Key Laboratory of Nuclear Physics and Technology School of PhysicsFusion Simulation CenterPeking UniversityBeijing 100871People's Republic of China Key Laboratory of Materials Modification by Laser Ion and Electron Beams(Ministry of Education)School of PhysicsDalian University of TechnologyDalian 116024People's Republic of China Harbin Institute of Technology Harbin 150001People's Republic of China Shaanxi Key Laboratory of Plasma Physics and Applied Technology Xi'an 710100People's Republic of China Xi'an Aerospace Propulsion Institute Xi'an 710100People's Republic of China School of Physics Beijing Institute of TechnologyBeijing 100081People's Republic of China

In this study,a code,named Peking University Helicon Discharge(PHD),which can simulate helicon discharge processes under both a background magnetic field greater than 500 G and a pressure less than 1 Pa,is *** the code,two fluid equations are *** PHD simulations led to two important findings:(1)the temporal evolution of plasma density with the background magnetic field exhibits a second rapid increase(termed as the second density jump),similar to the transition of modes in helicon plasmas;(2)in the presence of a magnetic field,the peak positions of electron power absorption appeared near the central axis,unlike in the case of no magnetic *** results may lead to an enhanced understanding of the discharge mechanism.

关键词： helicon plasma discharge process numerical simulation

In-flight vector magnetometer calibration for FY-3E satellite

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Science China(Technological Sciences) 2023年第6期66卷 1867-1868页

作者： WANG YongFu YU XiangQian ZONG QiuGang xiao chijie LIU Si CHEN HongFei ZOU Hong SHI WeiHong School of Earth and Space Sciences Peking UniversityBeijing 100871China School of Physics Peking UniversityBeijing 100871China School of Physics and Electronic Science Changsha University of Science&TechnologyChangsha 410114China

The FY-3E meteorological satellite was launched by China on July 5,*** orbit of the satellite is sun-synchronous with an orbit altitude 836 km and orbit period 102 *** satellite is equipped with a triaxial anisotropic magnetore-sistance magnetometer to detect ultra-low frequency waves in the *** magnetometer sensor is situated on the satellite *** is approximately 1 m away from the satellite body to reduce the effect of spacecraft fields.

关键词： magnetometer satellite equipped

Recent studies in satellite observations of three-dimensional magnetic reconnection

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Science China(Technological Sciences) 2007年第3期50卷 380-384页

作者： xiao chijie WANG xiaoGang PU ZuYin MA ZhiWei ZHAO Hui ZHOU GuiPing WANG JingXiu LIU ZhenXing National Astronomical Observatories Chinese Academy of SciencesBeijing 100012China School of Physics Peking UniversityBeijing 100871China School of Earth and Space Sciences Peking UniversityBeijing 100871China Institute for Fusion Theory and Simulation Zhejiang UniversityHangzhou 310027China Center for Space Science and Applied Research Chinese Academy of SciencesBeijing 100080China

Magnetic reconnection is a main process converting the magnetic energy into thermal and kinetic energy in plasmas. It is one of the fundamental problems of crucial importance not only to space plasmas physics and space weather studies,such as the solar flare,coronal mass ejections and magnetospheric substorms,but also to the stability analysis in magnetically confined fusion. In general,except for cases with periodical boundary conditions,three-dimensional(3D) magnetic re-connection occurs on magnetic separatrices generated by magnetic nulls. Here we briefly introduce/review the theories and some recent satellite observations of 3D magnetic reconnection. Topics to be further studied are also discussed.

关键词： magnetic reconnection null separatrix separator X-point X-line

Poloidal magnetic field reconstruction by laser-driven ion-beam trace probe in spherical tokamak

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Plasma Science and Technology 2024年第11期26卷 58-64页

作者： Zuyu ZHANG Tianchao XU chijie xiao Xianli HUANG Renchuan HE Ruixin YUAN xiaoyi YANG State Key Laboratory of Nuclear Physics and Technology School of PhysicsPeking UniversityBeijing 100871People’s Republic of China ENN Science and Technology Development Co.Ltd. Langfang 065001People’s Republic of China Harbin Institute of Technology Harbin 150001People’s Republic of China

The poloidal magnetic field( B_(p)) plays a critical role in plasma equilibrium, confinement and transport of magnetic confinement devices. Multiple diagnostic methods are needed to complement each other to obtain a more accurate B_(p) profile. Recently, the laser-driven ion-beam trace probe(LITP) has been proposed as a promising tool for diagnosing B_(p) and radial electric field( E_(r)) profiles in tokamaks [Yang X Y et al 2014 Rev. Sci. Instrum. 85 11E429]. The spherical tokamak(ST) is a promising compact device with high plasma beta and naturally large elongation. However, when applying LITP to diagnosing B_(p) in STs, the larger B_(p) invalidates the linear reconstruction relationship for conventional tokamaks, necessitating the development of a nonlinear reconstruction principle tailored to STs. This novel approach employs an iterative reconstruction method based on Newton's method to solve the nonlinear equation. Subsequently,a simulation model to reconstruct the B_(p) profile of STs is developed and the experimental setup of LITP is designed for EXL-50, a middle-sized ST. Simulation results of the reconstruction show that the relative errors of B_(p) reconstruction are mostly below 5%. Moreover, even with 5 mm measurement error on beam traces or 1 cm flux surface shape error, the average relative error of reconstruction remains below 15%, initially demonstrating the robustness of LITP in diagnosing B_(p) profiles in STs.

关键词： laser-driven ion-beam trace probe poloidal magnetic field diagnostic iterative reconstruction

Practicable method to identify ferromagnetic objects

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Science China(Technological Sciences) 2022年第12期65卷 3079-3081页

作者： YU XiangQian WANG YongFu xiao chijie LIU Si ZONG QiuGang CHEN HongFei ZOU Hong SHI WeiHong CHEN Ao School of Earth and Space Sciences Peking UniversityBeijing 100871China School of Physics Peking UniversityBeijing 100871China School of Physics and Electronic Science Changsha University of Science&TechnologyChangsha 410114China

Ferromagnetic objects are ubiquitous in the world and the identification of ferromagnetic objects is important in many *** the position and magnetic parameters of the ferromagnetic object from its magnetic signature i... 详细信息

关键词： ferromagnetic signature mining

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Estimation of China Fusion Engineering Test Reactor performance and burning fraction in different pellet fueling scenarios by a multi-species radial transport model

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Plasma Science and Technology 2022年第5期24卷 102-111页

作者： Weisheng LIN xiaogang WANG Xueqiao XU Defeng KONG Yumin WANG Jiale CHEN Zhanhui WANG chijie xiao State Key Lab of Nuclear Physics and Technology and School of Physics Peking UniversityBeijing 100871People’s Republic of China Department of Physics Institute of Space Environment and Matter ScienceHarbin Institute of TechnologyHarbin 150001People’s Republic of China Lawrence Livermore National Laboratory LivermoreCalifornia 94551United States of America Institute of Plasma Physics Chinese Academy of SciencesHefei 230031People’s Republic of China Southwestern Institute of Physics Chengdu 610041People’s Republic of China

Tritium self-sufficiency in future deuterium–tritium fusion reactors is a crucial *** an engineering test reactor,the China Fusion Engineering Test Reactor requires a burning fraction of 3%for the goal to test the accessibility to the future fusion *** self-consistently simulate burning plasmas with profile changes in pellet injection scenarios and to estimate the corresponding burning fraction,a one-dimensional multi-species radial transport model is developed in the BOUT++*** pellet-fueling scenarios are then tested in the *** results show that the increased fueling depth improves the burning fraction by particle confinement improvement and fusion power ***,by increasing the depth,the pellet cooling-down may significantly lower the temperature in the core *** the density perturbation into consideration,the reasonable parameters of the fueling scenario in these simulations are estimated as pellet radius r_(p)=3 mm,injection rate=4 Hz,and pellet injection velocity=1000–2000 m s^(-1) without drift or 450 m s^(-1) with high-field-side drift.

关键词： CFETR tritium burning fraction fueling scenarios

Relationship of mode transitions and standing waves in helicon plasmas

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Plasma Science and Technology 2022年第5期24卷 80-86页

作者： Mingyang WU chijie xiao xiaogang WANG Yue LIU Min XU Chang TAN Tianchao XU Xiuming YU Renchuan HE Andong XU State Key Laboratory of Nuclear Physics and Technology School of PhysicsFusion Simulation CenterPeking UniversityBeijing 100871People’s Republic of China Department of Physics Institute of Space Environment and Matter ScienceHarbin Institute of TechnologyHarbin 150001People’s Republic of China Key Laboratory of Materials Modiﬁcation by Laser Ion and Electron Beams(Ministry of Education)School of PhysicsDalian University of TechnologyDalian 116024People’s Republic of China Center for Fusion Science of Southwestern Institute of Physics Chengdu 610041People’s Republic of China Shaanxi Key Laboratory of Plasma Physics and Applied Technology Xi’an 710100People’s Republic of China Xi’an Aerospace Propulsion Institute Xi’an 710100People’s Republic of China

Helicon wave plasma sources have the well-known advantages of high efficiency and high plasma density, with broad applications in many areas. The crucial mechanism lies with mode transitions, which has been an outstanding issue for years. We have built a fluid simulation model and further developed the Peking University Helicon Discharge code. The mode transitions, also known as density jumps, of a single-loop antenna discharge are reproduced in simulations for the first time. It is found that large-amplitude standing helicon waves(SHWs) are responsible for the mode transitions, similar to those of a resonant cavity for laser *** paper intends to give a complete and quantitative SHW resonance theory to explain the relationship of the mode transitions and the SHWs. The SHW resonance theory reasonably explains several key questions in helicon plasmas, such as mode transition and efficient power absorption, and helps to improve future plasma generation methods.

关键词： helicon plasma mode transition standing wave resonance

AC vector magnetometer for space-based applications using low-resource magneto-impedance sensor

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Science China(Technological Sciences) 2023年第12期66卷 3663-3670页

作者： YU XiangQian HUANG Cong xiao chijie LI JiaWei LIU Si WANG JingDong LI YunPeng QU YaNan WANG YongFu CHEN HongFei ZOU Hong SHI WeiHong ZONG QiuGang CHEN xiaoFei ZHANG xiaoXin ZONG WeiGuo WANG JingSong School of Earth and Space Sciences Peking UniversityBeijing 100871China Key Laboratory of Space Weather National Satellite Meteorological Center(National Center for Space Weather)China Meteorological AdministrationBeijing 100081China Innovation Center for Feng-Yun Meteorological Satellite(FYSIC) Beijing 100081China School of Physics Peking UniversityBeijing 100871China School of Physics and Electronic Science Changsha University of Science&TechnologyChangsha 410114China Center for Space Science and Applied Research Chinese Academy of SciencesBeijing 100190China Institute of Shandong Aerospace Technology Yantai 264003China Shanghai Institute of Satellite Engineering(SISE) Shanghai 201108China

This study proposes a novel AC vector magnetometer developed using a low-resource magneto-impedance sensor for China’s Feng-Yun meteorological satellite(FY-3E).It was calibrated and characterized to determine its performance *** total weight of the AC vector magnetometer is 51 g(the aluminum box excluded),while the total power consumption is 310 m *** proposed AC vector magnetometer can detect magnetic field variations in the range of±1000 nT and noise power spectral density of≤50 pT/Hz^(1/2)@1 ***,the proposed device has a maximum nonlinearity of≤0.71‰over the entire range and a nonorthogonality error of 3.07 nT or 0.15%(root mean square).The total dose hardness of the sensor is≥30 krad(Si).Furthermore,we propose the first survey results of a magnetometer equipped aboard a Chinese FY-3E satellite in a Sunsynchronous *** data revealed that the AC vector magnetometer can detect transient physical signals such as quasistatic field-aligned currents(~50 nT)and waves at the auroral *** features render the proposed AC vector magnetometer suitable for space-based applications,particularly those involving the study of geomagnetic activity.

关键词： AC vector magnetometer low-resource magneto-impedance sensor FY-3E satellite