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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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    The impact of toroidal mode coupling on high-density discharges in J-TEXT

    邓鹏毛文哲陈志鹏周乙楠...
    1-8页
    查看更多>>摘要：Density limit has long been a widely studied issue influencing the operating range of tokamaks.The rapid growth of the m/n=2/1(where m and n are poloidal and toroidal mode numbers,respectively)tearing mode is generally regarded as a primary precursor to the density limit disruption.In this experiment,the coupling of the m/n=1/1 mode and the m/n=2/1 mode in high-density plasma was observed.During a sawtooth cycle,the frequencies of the two modes gradually converge until they become equal.After that,toroidal coupling occurs between the 1/1 and 2/1 modes,resulting in a mutually fixed phase relationship.With the occurrence of toroidal coupling,the 2/1 mode is stabilized.Prior to the disruption,the cessation of the 1/1 and 2/1 mode coupling,along with the rapid growth in the amplitude of the 2/1 mode,can be observed.Additionally,under the same parameters,comparing discharges with or without the 1/1 mode,it is found that the presence of the 1/1 mode leads to higher plasma density and temperature parameters.
      原文链接:
    • 万方数据
    • 维普

    Characteristics of divertor heat flux distri-bution with an island divertor configuration on the J-TEXT tokamak

    杨雨桐梁云峰严伟舒双宝...
    9-17页
    查看更多>>摘要：On J-TEXT,the temporal evolution of heat flux distribution on the high-field side(HFS)divertor plate has been measured by an infrared(IR)camera during the plasma operation with an island divertor configuration.In experiments,the island divertor configuration is an edge magnetic island chain structure surrounded by stochastic layers,which can be induced by resonant magnetic perturbations(RMPs).The experimental results show that the heat flux distribution on the HFS target plate depends significantly on the edge magnetic topology.Furthermore,the impact of hydrogen fueling using supersonic molecular beam injection(SMBI)on the divertor heat flux distributions is studied on J-TEXT with an island divertor configuration.It has been observed that power detachment can be achieved when the radiation front approaches the last closed flux surface(LCFS)after each SMBI pulse.This result may provide a method of access for divertor detachment on a fusion device with a three-dimensional(3D)boundary magnetic structure.
      原文链接:
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    Studies of beam ion confinement to enhance plasma performance on EAST

    付静黄娟王进芳虞立敏...
    18-30页
    查看更多>>摘要：A key physics issue for achieving steady-state high-performance plasmas on EAST tokamak is to decrease beam-ion losses to improve plasma confinement during neutral beam injections(NBIs).To decrease the beam losses,previous counter-Ip NBI injections are upgraded to co-Ip injections.Analysis shows that due to the reversed direction of drift across the flux surfaces caused by the pitch angle,the beam prompt loss fraction decreases from about 49％to 3％after the upgrade.Moreover,because of the change of entire beam path,beam shine-through(ST)loss fraction for counter-Ip tangential and counter-Ip perpendicular injections is reversed to co-Ip tangential and co-Ip perpendicular injections,respectively.Due to the change in the initial trapped-confined beam ion fraction caused by the peaked pitch profiles,the losses induced by toroidal ripple field are also reversed after the upgrade.To further improve the beam-ion confinement under the present NBI layout,the amplitudes of toroidal field are increased from 1.75 to 2.20 T.Result shows that,due to the smaller orbit width and peaked pitch angle profile,the beam prompt loss power is lower with higher toroidal field.Due to the synergy of higher initial trapped-confined beam ion fraction and narrower Goldston-White-Boozer(GWB)boundary,the loss induced by ripple diffusion is higher with higher toroidal field.The combined effect of beam ST loss,prompt loss and ripple loss,contributes to the increase in beam ion density.The decrease in beam loss power enhances beam heating efficiency,especially the fraction of beam heating ions.Finally,comparison between simulation and measurement by 235U fission chamber(FC)indicates that the increase in neutron rate is mainly contributed by improvement of beam-ion confinement.This study can provide potential support for beam operation and high-Ti experiment on EAST tokamak.
      原文链接:
    • 万方数据
    • 维普

    Equilibrium reconstruction method for self-organized plasmas on reversed field pinches with polarimeter-interferometer

    黄玉华刘珂毛文哲祝曹祥...
    31-40页
    查看更多>>摘要：In the reversed field pinch(RFP),plasmas exhibit various self-organized states.Among these,the three-dimensional(3D)helical state known as the"quasi-single-helical"(QSH)state enhances RFP confinement.However,accurately describing the equilibrium is challenging due to the presence of 3D structures,magnetic islands,and chaotic regions.It is difficult to obtain a balance between the available diagnostic and the real equilibrium structure.To address this issue,we introduce KTX3DFit,a new 3D equilibrium reconstruction code specifically designed for the Keda Torus eXperiment(KTX)RFP.KTX3DFit utilizes the stepped-pressure equilibrium code(SPEC)to compute 3D equilibria and uses polarimetric interferometer signals from experiments.KTX3DFit is able to reconstruct equilibria in various states,including axisymmetric,double-axis helical(DAx),and single-helical-axis(SHAx)states.Notably,this study marks the first integration of the SPEC code with internal magnetic field data for equilibrium reconstruction and could be used for other 3D configurations.
      原文链接:
    • 万方数据
    • 维普

    Fuel recycling feedback control via real-time boron powder injection in EAST with full metal wall

    汪哲孙震左桂忠吴凯...
    41-48页
    查看更多>>摘要：A feedback control of fuel recycling via real-time boron powder injection,addressing the issue of continuously increasing recycling in long-pulse plasma discharges,has been successfully developed and implemented on EAST tokamak.The feedback control system includes four main parts:the impurity powder dropper(IPD),a diagnostic system measuring fuel recycling level represented by Dα emission,a plasma control system(PCS)implementing the Proportional Integral Derivative(PID)algorithm,and a signal converter connecting the IPD and PCS.Based on this control system,both active control and feedback control experiments have recently been performed on EAST with a full metal wall.The experimental results show that the fuel recycling can be gradually reduced to lower level as PCS control voltage increases.In the feedback control experiments,it is also observed that the Dα emission is reduced to the level below the target Dα value by adjusting boron injection flow rate,indicating successful implementation of the fuel recycling feedback control on EAST.This technique provides a new method for fuel recycling control of long pulse and high parameter plasma operations in future fusion devices.
      原文链接:
    • 万方数据
    • 维普

    Effect of attack angle on the electromag-netic wave transmission characteristics in the hypersonic plasma sheath of a re-entry vehicle

    艾昕聂秋月张仲麟陈培奇...
    49-62页
    查看更多>>摘要：The attack angle may greatly affect the hypersonic plasma sheaths around the re-entry vehicle,thereby affecting the transmission characteristics of electromagnetic(EM)waves in the sheaths.In this paper,we propose an integrated three-dimensional(3D)model with various attack angles and realistic flying conditions of radio attenuation measurement C-Ⅱ(RAM C-Ⅱ)re-entry tasks for analyzing the effect of the attack angle on the transmission characteristics of EM waves in the sheaths.It is shown that the electron density and collision frequency of the sheath on the windward side can be increased by an order of magnitude with the increase of the attack angle.Meanwhile,the thickness of the sheath on the leeward side is increased where the electron density and collision frequency are reduced.The EM waves are mainly reflected on the windward plasma sheath due to the cutoff effect,and the radio-frequency(RF)blackout is mitigated if the antenna is positioned on the leeward side.Thus,by planning the trajectory properly and installing the antenna accordingly during the re-entry,it is possible to provide an approach for mitigation of the RF blackout problem to an extent.
      原文链接:
    • 万方数据

    Effects of external parameters on plasma characteristics and uniformity in a dual cylindrical inductively coupled plasma

    王鹏宇邢思雨韩道满张钰如...
    63-74页
    查看更多>>摘要：The dual cylindrical inductively coupled plasma source,compared to the conventional structure of inductively coupled plasma source,can significantly improve the uniformity of plasma.It has an enhanced potential for application in processes,such as etching and ashing.A uniform plasma can be obtained by allowing the remote plasma from the upper chamber modulate the main plasma generated in the lower chamber.In this study,a fluid model was employed to investigate a dual cylindrical inductively coupled Ar/O2 discharge.The effects of external parameters on electron density,electron temperature,O atomic density,and plasma uniformity in the main chamber were studied,and the reasons were analyzed.The results of this study show that remote power can control the plasma uniformity and increase the plasma density in the main chamber.As the remote power increased,plasma uniformity improved initially and then deteriorated.The main power affected the plasma density at the edge of the main chamber and can modulate the plasma density in the main chamber.The gas pressure affected both the uniformity and density of the plasma.As the gas pressure increased,the plasma uniformity deteriorated,but the free radical density improved.
      原文链接:
    • 万方数据
    • 维普

    Influence of bias voltage and oxygen addition on the discharge aspects of a diffuse argon plume in an atmospheric pressure plasma jet

    贾鹏英韩国新董秀品吴凯玥...
    75-81页
    查看更多>>摘要：A remote plasma,also referred to as a plasma plume(diffuse or filamentary),is normally formed downstream of an atmospheric pressure plasma jet.In this study,a diffuse plume is formed by increasing the bias voltage(Ub)applied to the downstream electrode of an argon plasma jet excited by a negatively pulsed voltage.The results indicate that the plume is filamentary when Ub is low,which transits to the diffuse plume with increasing Ub.The discharge initiated at the rising edge of the pulsed voltage is attributed to the diffuse plume,while that at the falling edge contributes to the filament in the plume.For the diffuse plume,the discharge intensity decreases with the increasing oxygen content(Co).Fast photography reveals that the diffuse plume results from a negative streamer,which has a dark region near the nozzle with Co=0％.However,the dark region is absent with Co=0.5％.From the optical emission spectrum,the electron density,electron excitation temperature,gas temperature,and oxygen atom concentration are investigated.
      原文链接:
    • 万方数据
    • 维普

    Progress in the creation of long-lived atmospheric luminous formations in a pulsed electric discharge with an electrolytic electrode

    姚静锋李健飞赵世鑫袁承勋...
    82-88页
    查看更多>>摘要：This work presents an analysis of the research conducted in many countries in recent years on the so-called Gatchina discharge.The findings indicate that the Gatchina discharge exhibits the majority of the characteristics of natural ball lightning,making it the most effective method for reproducing and studying this phenomenon.To a large extent,our new results are based on experiments performed for the first time to visualize dust particles arising in an erosive emission,as well as the formation of vortex flows.These experiments make it possible to explain the ability of the Gatchina discharge to maintain its shape for a long time in the afterglow.
      原文链接:
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    • 维普

    Theoretical study of particle and energy balance equations in locally bounded plasmas

    Hyun-Su JUNYat Fung TSANGJae Ok YOONavab SINGH...
    89-98页
    查看更多>>摘要：In this study,new particle and energy balance equations have been developed to predict the electron temperature and density in locally bounded plasmas.Classical particle and energy balance equations assume that all plasma within a reactor is completely confined only by the reactor walls.However,in industrial plasma reactors for semiconductor manufacturing,the plasma is partially confined by internal reactor structures.We predict the effect of the open boundary area(A'L,eff)and ion escape velocity(ui)on electron temperature and density by developing new particle and energy balance equations.Theoretically,we found a low ion escape velocity(ui/uB ≈ 0.2)and high open boundary area(A'L,eff/AT,eff ≈ 0.6)to result in an approximately 38％increase in electron density and an 8％decrease in electron temperature compared to values in a fully bounded reactor.Additionally,we suggest that the velocity of ions passing through the open boundary should exceed ωpiλDe under the condition E02＜＜(Φ/λDe)2.
      原文链接:
    • 万方数据
    • 维普