分段表面放电沉积效率研究

利用一种结构紧凑的分段表面放电辐射源模块，详细研究了在不同电压、电容、气压实验条件下回路等效电阻、等效电感及放电能量沉积效率的变化规律，利用四分幅相机拍摄获得了不同实验条件下的放电等离子体通道图像，分析讨论了放电等离子体运动对放电能量沉积效率的影响，提出了提高能量放电沉积效率的有效途径。

Dynamic simulations of an ion diode for high power pulsed ion beams

Based on the explosive emission model, the self consistent and 2.5 dimensional electromagnetic particle in cell MAGIC code was employed to simulate the dynamics of the particles, including electron and proton, in a planar magnetically insulated ion diode for high power pulsed ion beams. Time dependent diode characteristics, spatial and phasespace distributions of the charged particles, as well as the distribution of the net charge density and the electric field in the anode cathode(AC) gap are presented at a diode voltage of 300kV and a double intensity of the critical magnetic field. The results show that the extracted ion current density is five times larger than the single species limited ion current density according to Child Langmuir law. The virtual cathode forms in the vicinity of the cathode surface when the external magnetic field applied, and the space charge leads to the fluctuation and enhancement of the electric field in the AC gap.