圆柱形阳极层霍尔推力器内轮辐效应的实验研究
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摘要
为了研究圆柱形阳极层霍尔推力器内关于电子反常输运的轮辐效应(Rotating Spoke),分别采用高速相机和静电探针来捕捉圆柱形阳极层霍尔推力器内的轮辐效应图像和等离子体震荡频率。结果表明:在放电电压350V,放电电流3.5A,阳极上表面处的磁场强度为125Gs,工作气压为2×10-2Pa时,由测得轮辐效应的放电图像和波形可知,轮辐效应的频率为10kHz～12.5kHz。当磁场强度增加到205Gs,放电电流增加到4A时,轮辐效应的频率增加到25kHz,并且轮辐效应出现分裂和合并现象。此研究结果表明,圆柱形阳极层霍尔推力器内不仅存在轮辐效应现象以及角向电场,而且不同的工作参数会有不同的轮辐效应模式和频率。
In order to study the rotating spoke of the anomalous electron transport,images of the Rotating Spoke captured by a high-speed camera and waveforms measured by an electrostatic probe are employed to analyze the cylindrical anode layer Hall accelerator. In the system,the discharge is 350 V and 3.5 A,magnetic field of the anode surface is 125 Gs,working pressure is 2×10-2 Pa,and frequency of the Rotating Spoke is between 10.0 kHz and 12.5 kHz. When the magnetic field and current increases to 205 Gs and 4 A,respectively,the frequency of the Rotating Spoke reaches 25 kHz. Division and consolidation are observed from the Rotating Spoke.The results show that there are Rotating Spoke phenomena and angular electric field in cylindrical anode layer Hall thruster,and different operating parameters have different Rotating Spoke modes and frequencies.
In order to study the rotating spoke of the anomalous electron transport,images of the Rotating Spoke captured by a high-speed camera and waveforms measured by an electrostatic probe are employed to analyze the cylindrical anode layer Hall accelerator. In the system,the discharge is 350 V and 3.5 A,magnetic field of the anode surface is 125 Gs,working pressure is 2×10-2 Pa,and frequency of the Rotating Spoke is between 10.0 kHz and 12.5 kHz. When the magnetic field and current increases to 205 Gs and 4 A,respectively,the frequency of the Rotating Spoke reaches 25 kHz. Division and consolidation are observed from the Rotating Spoke.The results show that there are Rotating Spoke phenomena and angular electric field in cylindrical anode layer Hall thruster,and different operating parameters have different Rotating Spoke modes and frequencies.
引文
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[19]Zhao Jie,Tang Deli,Geng Shaofei.Anode Magnetic Shield Effect on Magnetic Field and Ion Beam in Cylindrical Hall Thruster[J].Plasma Science and Technolgy,2010,12(1):109-112.
[2]Zhurin V V,Kaufmann H R,Robinson R S.Physics of Closed Drift Thrusters[J].Plasma Sources Science and Technology,1999,8:R1-R20
[3]A Smirnov,Raitses Y,Fisch N J.Experimental and Theoretical Studies of Cylindrical Hall Thrusters[J].Physics of Plasmas,2007,14(5).
[4]Chesta E,Meezan N B,Cappelli M A.Stability of a Magnetized Hall Plasma Discharge[J].Journal of Applied Physics,2001,89(6):3099-3107.
[5]A I Morozov,V V Savelev.Theory of the Near-Wall Conductivity[J].Plasma Physics Reports,2001,27(7):570-575.
[6]Parker J B,Raitses Y,Fisch N J.Transition in Electron Transport in a Cylindrical Hall Thruster[J].Applied Physics Letters,2010,97(9).
[7]Maggs J E,Carter T A,Taylor R J.Transition from Bohm to Classical Diffusion Due to Edge Rotation of a Cylindrical Plasma[J].Physics of Plasmas,2007,14(5).
[8]Keidar M,Beilis I.2D Expansion of the Low-Density Interelectrode Vacuum Arc Plasma Jet in an Axial Magnetic Field[J].Journal of Physics D:Applied Physics,1996,29(7):1973-1983.
[9]Tang D L,Geng S F,Qiu X M,et al.Three Dimensional Numerical Investigation of Electron Transport with Rotating Spoke in a Cylindrical Anode Layer Hall Plasma Accelerator[J].Physics of Plasmas,2012,19(4).
[10]Janes G S,Lowder R S.Anomalous Electron Diffusion and Ion Acceleration in a Low-Density Plasma[J].Physics of Fluids,1996,9(6):1115-1123.
[11]Mcdonald M S,Gallimore A D.Parametric Investigation of the Rotating Spoke Instability in Hall Thrusters[C].Wiesbaden:32th International Electric Propulsion Conference,2011.
[12]Lomas P J,Kilkenny J D.Electrothermal Instabilities in a Hall Accelerator[J].Plasma Physics,1977,19:329-341.
[13]Ellison C L,Raitses Y,Fisch N J.Cross-Field Electron Transport Induced by a Rotating Spoke in a Cylindrical Hall Thruster[J].Physics of Plasmas,2012,19(1).
[14]Ito T,Cappelli M A.High Speed Images of Drift Waves and Turbulence in Magnetized Microplasmas[J].IEEETransactions on Plasma Science,2008,36(4):1228-1229.
[15]Ito T,Cappelli M A.Electrostatic Probe Disruption of Drift Waves in Magnetized Microdischarges[J].Applied Physics Letters,2009,94(21).
[16]Ellison C L,Raitses Y,Fisch N J.Cross-Field Electron Transport Induced by a Rotating Spoke in a Cylindrical Hall Thruster[J].Physics of Plasmas,2012,19(1).
[17]Geng S F,Qiu X M,Cheng C M,et al.Three-Dimensional Particle-in-Cell Simulation of Discharge Characteristics in Cylindrical Anode Layer Hall Plasma Accelerator[J].Physics of Plasmas,2012,19(4).
[18]Tang D L,Zhao J,Wang L S,et al.Effects of Magnetic Field Gradient on Ion Beam Current in Cylindrical Hall Ion Source[J].Journal of Applied Physics,2007,102(12).
[19]Zhao Jie,Tang Deli,Geng Shaofei.Anode Magnetic Shield Effect on Magnetic Field and Ion Beam in Cylindrical Hall Thruster[J].Plasma Science and Technolgy,2010,12(1):109-112.