Two-dimensional(2-D)and three-dimensional(3-D)hybrid simulations are carried out for mode conversion from fast mode compressional wave to kinetic Alfvn waves(KAWs)at the inhomogeneous magnetopause *** cases in which...
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Two-dimensional(2-D)and three-dimensional(3-D)hybrid simulations are carried out for mode conversion from fast mode compressional wave to kinetic Alfvn waves(KAWs)at the inhomogeneous magnetopause *** cases in which the incident fast wave propagates in the xz plane,with the magnetopause normal along x and the background magnetic field pointing along z,the 2-D (xz)simulation shows that KAWs with large wave number kxρi～1 are generated near the Alfve′n resonance surface,whereρi is the ion Larmor *** nonlinear wave properties are manifest in the mode conversion *** of the driver frequency are *** a result of nonlinear wave interaction,the mode conversion region and its spectral width are *** the 3-D simulation,after this first stage of the mode conversion to KAWs with large kx,a subsequent generation of KAW modes of finite ky is observed in the later stage,through a nonlinear parametric decay *** the nonlinear cascade to ky can lead to massive transport at the magnetopause,the simulation results provide an effective transport mechanism at the plasma boundaries in space as well as laboratory plasmas.
在现有的微通道板皮料玻璃配方的基础上,经过一系列的制作工艺设计和改进,最终制作出了具有合适性能的单螺旋通道的通道电子倍增器;之后搭建了以盘香型钽灯丝作为输入电流的通道电子倍增器(Channel Electron Multiplier,CEM)模拟模式测...
详细信息
在现有的微通道板皮料玻璃配方的基础上,经过一系列的制作工艺设计和改进,最终制作出了具有合适性能的单螺旋通道的通道电子倍增器;之后搭建了以盘香型钽灯丝作为输入电流的通道电子倍增器(Channel Electron Multiplier,CEM)模拟模式测试装置和以紫外发光二极管结合金阴极作为输入信号的CEM脉冲计数模式测试装置,对该器件的综合性能参数进行全面的测试与评价;测试结果表明:本实验室自行研制的单螺旋通道的通道电子倍增器的模拟增益和脉冲增益分别为1×10^(4)~1×10^(6)和1×10^(7)~1×10^(8),增益值随着工作电压的升高而增加,输出脉冲的上升时间为2~3 ns,性能接近国外同行的同类器件。
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