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首页> 外文期刊>Journal of Physics, D. Applied Physics: A Europhysics Journal >Experimental studies of ion beam anisotropy in a low energy plasma focus operating with methane
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Experimental studies of ion beam anisotropy in a low energy plasma focus operating with methane

机译:甲烷在低能等离子体焦点中离子束各向异性的实验研究

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We have investigated, with time and space resolution, the ion beam emission from a plasma focus (PF) device, operating in methane, at 20 kV, with 1.8 kJ stored energy. A detector array is used to measure simultaneously the ion beams at five different angular directions with respect to the PF axis (0 degrees, 10 degrees, 15 degrees, 20 degrees and 90 degrees), at a distance of 77 cm from the ion source. Ion beam energy correlations for operation in methane indicate that the dominant charge states on the detector are H+, C+4 and C+5, irrespective of the angular positions. The time integrated ion beam signal and the energy-dispersive x-ray analysis of a carbon films deposited on silicon surface shows the impurity emission from the PF electrode surface. Measured ion fluxes are maximum for the energy range of 15-40 keV, 50-100 keV and 100-300 keV, for H+, C+4, and C+5, respectively. Measurements of the angular distribution of hydrogen and carbon ions reveal a strong angular anisotropy. It is argued that the observed angular anisotropy of the ion beam emission can be explained in terms of ion Larmor radius effects during the z-pinch like plasma formation phase, which is characteristic of PF discharges.
机译:我们已经研究了具有时间和空间分辨率的等离子体聚焦(PF)装置的离子束发射,该装置在20 kV的甲烷中工作,存储的能量为1.8 kJ。检测器阵列用于在距离子源77厘米的距离处同时测量相对于PF轴(5度,10度,15度,20度和90度)的五个不同角度方向上的离子束。在甲烷中运行的离子束能量相关性表明,检测器上的主要电荷状态为H +,C + 4和C + 5,与角度位置无关。时间积分离子束信号和沉积在硅表面的碳膜的能量色散X射线分析表明,从PF电极表面发射出杂质。对于H +,C + 4和C + 5,分别在15-40 keV,50-100 keV和100-300 keV的能量范围内测得的离子通量最大。氢和碳离子的角度分布的测量结果显示出很强的角度各向异性。有人认为,观察到的离子束发射的角度各向异性可以用z捏样等离子体形成阶段中的离子拉莫尔半径效应来解释,这是PF放电的特征。

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