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等离子体科学和技术（英文版）
等离子体科学和技术（英文版）

万元熙、谢纪康

月刊

1009-0630

pst@ipp.ac.cn

0551-5591617，5593176

230031

合肥 中国科学院等离子体物理研究所PST编辑部

等离子体科学和技术（英文版）/Journal Plasma Science and TechnologyCSCD北大核心EISCI
查看更多>>“Plasma Science & Technology”（等离子体科学和技术）是中国科学院等离子体物理研究所主办的英文版学术期刊。其宗旨是向国内外报导我国等离子体科学界和国外科学家在高温等离子体、低温等离子体、天体空间等离子体、放电等离子体和激光等离子体等各个领域在基础研究、实验探索、装置建设和应用开发中所取得的具有新意的学术成果或阶段性成果，并刊登反映这些学科国际、国内发展新方向、新动态的综述，以及与等离子体有关的交叉学科和应用方面的最新成就等。
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    Impurity modes in two-dimensional strongly coupled complex plasma crystals

    吴诗杰徐韵乔冼顺宇何向磊...
    1-7页
    查看更多>>摘要：Complex plasma fluctuation processes have been extensively studied in many aspects,especially lattice waves in strongly coupled plasma crystals,which are of great significance for understanding fundamental physical phenomena.A challenge of experimental investigations in two-dimensional strongly coupled complex plasma crystals is to keep the main body and foreign particles of different masses on the same horizontal plane.To solve the problem,we have proposed a potential well formed by two negatively biased grids to bind the negatively charged particles in a two-dimensional(2D)plane,thus achieving a 2D plasma crystal in the microgravity environment.The study of such phenomena in complex plasma crystals under microgravity environment then becomes possible.In this paper,we focus on the continuum spectrum,including both phonon and optic branches of the impurity mode in a 2D system in microgravity environments.The results show the dispersion relation of the longitudinal and transverse impurity oscillation modes and their properties.Considering the macroscopic visibility of complex mesoscopic particle lattices,theoretical and experimental studies on this kind of complex plasma systems will help us further understand the physical nature of a wide range of condensed matters.
      原文链接:
    • 万方数据
    • 维普

    Suppression of the m/n=2/1 tearing mode by electron cyclotron resonance heating on J-TEXT

    方建港陈忠勇严伟王能超...
    8-17页
    查看更多>>摘要：Stabilization of tearing modes and neoclassical tearing modes is of great importance for tokamak operation.Electron cyclotron waves(ECWs)have been extensively used to stabilize the tearing modes with the virtue of highly localized power deposition.Complete suppression of the m/n=2/1 tearing mode(TM)by electron cyclotron resonance heating(ECRH)has been achieved successfully on the J-TEXT tokamak.The effects of ECW deposition location and power amplitude on the 2/1 TM suppression have been investigated.It is found that the suppression is more effective when the ECW power is deposited closer to the rational surface.As the ECW power increases to approximately 230 kW,the 2/1 TM can be completely suppressed.The island rotation frequency is increased when the island width is reduced.The experimental results show that the local heating inside the magnetic island and the resulting temperature perturbation increase at the O-point of the island play dominant roles in TM suppression.As the ECW power increases,the 2/1 island is suppressed to smaller island width,and the flow shear also plays a stabilizing effect on small magnetic islands.With the stabilizing contribution of heating and flow shear,the 2/1 TM can be completely suppressed.
      原文链接:
    • 万方数据
    • 维普

    First spectroscopic study of HFRC plasma

    毛安程芝峰饶波杨菁珉...
    18-24页
    查看更多>>摘要：An advanced spectral diagnostic system was developed to measure the electron temperature(Te),electron density(Ne),and ion temperature(Ti)of the Huazhong University of Science and Technology field-reversed configuration plasma.The system consists of an optic fiber spectrometer with a wide spectral band and a 670 mm focal length high throughout Czerny-Turner monochromator equipped with both a 3600 g mm-1 grating and a 2400 g mm-1 grating to measure the line spectrum.Accompanying these components is an electron-multiplying charge-coupled device camera to capture spectral data.The relative intensity of the optical fiber spectrometer was calibrated using a standard luminance source,and the wavelength calibration of the spectrometer was accomplished using a Hg/Ar lamp.This diagnostic setup was configured to measure electron density based on the Stark effect of Hγ(n=5 → n=2;434.04 nm).Doppler broadening of an O Ⅲ(2s22p(2P0)3p → 2s22p(2P0)3s;375.988 nm)emission line was measured and analyzed to obtain the ion temperature,and electron temperatures were estimated from the relative strength of Hβ(n=4 →n=2;486.14 nm)(Dβ)and Hγ(Dγ)spectral lines when the electron density was obtained from Stark effect measurements.The initial experimental results indicate that the highest electron temperature of the formation region was approximately 8 eV,the electron density of the colliding-and-merging region was approaching 1020 m-3,and the ion temperature reached about 40 eV.
      原文链接:
    • 万方数据
    • 维普

    Coated boron layers by boronization and a real-time boron coating using an impurity powder dropper in the LHD

    Naoko ASHIKAWARobert LUNSFORDFederico NESPOLIErik GILSON...
    25-31页
    查看更多>>摘要：In the Large Helical Device(LHD),diborane(B2H6)is used as a standard boron source for boronization,which is assisted by helium glow discharges.In 2019,a new Impurity Powder Dropper(IPD)system was installed and is under evaluation as a real-time wall conditioning technique.In the LHD,which is a large-sized heliotron device,an additional helium(He)glow discharge cleaning(GDC)after boronization was operated for a reduction in hydrogen recycling from the coated boron layers.This operational time of 3 h was determined by spectroscopic data during glow discharges.A flat hydrogen profile is obtained on the top surface of the coated boron on the specimen exposed to boronization.The results suggest a reduction in hydrogen at the top surface by He-GDC.Trapped oxygen in coated boron was obtained by boronization,and the coated boron,which has boron-oxide,on the first wall by B-IPD was also shown.Considering the difference in coating areas between B2H6 boronization and B-IPD operation,it would be most effective to use the IPD and B2H6 boronization coating together for optimized wall conditioning.
      原文链接:
    • 万方数据
    • 维普

    Experimental confirmation of the linear rela-tion between plasma current and external vertical magnetic field in EXL-50 spherical torus energetic electron plasmas

    董力立王明远刘文军石跃江...
    32-36页
    查看更多>>摘要：A three-fluid equilibrium plasma with bulk plasma and energetic electrons has been observed on the Xuanlong-50(EXL-50)spherical torus,where the energetic electrons play a crucial role in sustaining the plasma current and pressure.In this study,the equilibrium of a multi-fluid plasma was investigated by analyzing the relationship between the external vertical magnetic field(Bv),plasma current(Ip),the poloidal ratio(βp)and the Shafranov formula.Remarkably,our research demonstrates some validity of the Shafranov formula in the presence of multi-fluid plasma in EXL-50 spherical torus.This finding holds significant importance for future reactors as it allows for differentiation between alpha particles and background plasma.The study of multi-fluid plasma provides a significant reference value for the equilibrium reconstruction of burning plasma involving alpha particles.
      原文链接:
    • 万方数据

    Wavelength calibration and spectral analysis of vacuum ultraviolet spectroscopy in EAST

    计华健张洪明吕波Cheonho BAE...
    37-43页
    查看更多>>摘要：A vacuum ultraviolet(VUV)spectroscopy with a focal length of 1 m has been engineered specifically for observing edge impurity emissions in Experimental Advanced Superconducting Tokamak(EAST).In this study,wavelength calibration for the VUV spectroscopy is achieved utilizing a zinc lamp.The grating angle and charge-coupled device(CCD)position are carefully calibrated for different wavelength positions.The wavelength calibration of the VUV spectroscopy is crucial for improving the accuracy of impurity spectral data,and is required to identify more impurity spectral lines for impurity transport research.Impurity spectra of EAST plasmas have also been obtained in the wavelength range of 50-300 nm with relatively high spectral resolution.It is found that the impurity emissions in the edge region are still dominated by low-Z impurities,such as carbon,oxygen,and nitrogen,albeit with the application of full-tungsten divertors on the EAST tokamak.
      原文链接:
    • 万方数据
    • 维普

    Conceptual design of the tail research experiment at the Space Plasma Environ-ment Research Facility(SPERF-TREX)

    肖青梅毛傲华何向磊邹继同...
    44-49页
    查看更多>>摘要：The Space Plasma Environment Research Facility(SPERF)for ground simulation of the space plasma environment is a key component of the Space Environment Simulation Research Infrastructure(SESRI),a major national science and technology infrastructure for fundamental research.It is designed to investigate outstanding issues in the space plasma environment,such as energetic particle acceleration,transport,and interaction with electromagnetic waves,as well as magnetic reconnection processes,in magnetospheric plasmas.The Tail-Research EXperiment(TREX)is part of the SPERF for laboratory studies of space physics relevant to magnetic reconnection,dipolarization and hydromagnetic wave excitation in the magnetotail.SPERF-TREX is designed to carry out three types of experiments:the tail plasmoid for magnetic reconnection,dipolarization front formation,and magnetohydrodynamic waves excited by high-speed plasma jets.In this paper,the scientific goals and three scenarios of SPERF-TREX for typical processes in space plasmas are presented,and experimental plans for SPERF-TREX are also reviewed,together with the plasma sources applied to generate the plasma with the desired parameters and various magnetic configurations.
      原文链接:
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    Formation mechanism of bright and dark concentric-ring pattern in dielectric barrier discharge

    李彩霞冯建宇王舒畅李骋...
    50-57页
    查看更多>>摘要：In this work,a bright and dark concentric-ring pattern is reported in a dielectric barrier discharge for the first time.The spatiotemporal dynamics of the bright and dark concentric-ring pattern are investigated with an intensified charge-coupled device and photomultiplier tubes.The results indicate that the bright and dark concentric-ring pattern is composed of three concentric-ring sublattices.These are bright concentric-ring structures,dark concentric-ring structures and wider concentric-ring structures,respectively.The bright concentric-ring structures and dark concentric-ring structures are alternately distributed.The bright concentric-ring structures are located at the centre of the wider concentric-ring structures.The wider concentric-ring structures first form from the outer edge and gradually develop to the centre.The essence of all three concentric-ring structures is the individual discharge filaments.The optical emission spectra of different sublattices are acquired and analysed.It is found that the plasma parameters of the three concentric-ring sublattices are different.Finally,the formation mechanism of the bright and dark concentric-ring pattern is discussed.
      原文链接:
    • 万方数据
    • 维普

    Abnormal transition of the electron energy distribution with excitation of the second harmonic in low-pressure radio-frequency capacitively coupled plasmas

    余乐怡陆文琪张丽娜
    58-63页
    查看更多>>摘要：The self-excited second harmonic in radio-frequency capacitively coupled plasma was significantly enhanced by adjusting the external variable capacitor.At a lower pressure of 3 Pa,the excitation of the second harmonic caused an abnormal transition of the electron energy probability function,resulting in abrupt changes in the electron density and temperature.Such changes in the electron energy probability function as well as the electron density and temperature were not observed at the higher pressure of 16 Pa under similar harmonic changes.The phenomena are related to the influence of the second harmonic on stochastic heating,which is determined by both amplitude and the relative phase of the harmonics.The results suggest that the self-excited high-order harmonics must be considered in practical applications of low-pressure radio-frequency capacitively coupled plasmas.
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    • 维普

    Machine learning for parameters diagnosis of spark discharge by electro-acoustic signal

    熊俊卢诗宇刘晓明周文俊...
    64-72页
    查看更多>>摘要：Discharge plasma parameter measurement is a key focus in low-temperature plasma research.Traditional diagnostics often require costly equipment,whereas electro-acoustic signals provide a rich,non-invasive,and less complex source of discharge information.This study harnesses machine learning to decode these signals.It establishes links between electro-acoustic signals and gas discharge parameters,such as power and distance,thus streamlining the prediction process.By building a spark discharge platform to collect electro-acoustic signals and implementing a series of acoustic signal processing techniques,the Mel-Frequency Cepstral Coefficients(MFCCs)of the acoustic signals are extracted to construct the predictors.Three machine learning models(Linear Regression,k-Nearest Neighbors,and Random Forest)are introduced and applied to the predictors to achieve real-time rapid diagnostic measurement of typical spark discharge power and discharge distance.All models display impressive performance in prediction precision and fitting abilities.Among them,the k-Nearest Neighbors model shows the best performance on discharge power prediction with the lowest mean square error(MSE=0.00571)and the highest R-squared value(R2=0.93877).The experimental results show that the relationship between the electro-acoustic signal and the gas discharge power and distance can be effectively constructed based on the machine learning algorithm,which provides a new idea and basis for the online monitoring and real-time diagnosis of plasma parameters.
      原文链接:
    • 万方数据
    • 维普