We present a study of the ion stopping power due to free and bound electrons in a warm dense plasma.Our main goal is to propose a method of stopping-power calculation expected to be valid for any ionization degree.The...We present a study of the ion stopping power due to free and bound electrons in a warm dense plasma.Our main goal is to propose a method of stopping-power calculation expected to be valid for any ionization degree.The free-electron contribution is described by the Maynard–Deutsch–Zimmerman formula,and the bound-electron contribution relies on the Bethe formula with corrections,in particular taking into account density and shell effects.The results of the bound-state computation using three different parametric potentials are investigated within the Garbet formalism for the mean excitation energy.The first parametric potential is due to Green,Sellin,and Zachor,the second one was proposed by Yunta,and the third one was introduced by Klapisch in the framework of atomic-structure computations.The results are compared with those of self-consistent average-atom calculations.This approach correctly bridges the limits of neutral and fully ionized matter.展开更多
超高压直流(high voltage direct current,HVDC)输电线路离子流场的计算对于输电线路的设计具有重要意义。然而考虑地电位升高的地面离子流场的计算却很少,为此,在Deutsch假设的基础上,为了研究计及地电位升高时HVDC输电线路产生的离子...超高压直流(high voltage direct current,HVDC)输电线路离子流场的计算对于输电线路的设计具有重要意义。然而考虑地电位升高的地面离子流场的计算却很少,为此,在Deutsch假设的基础上,为了研究计及地电位升高时HVDC输电线路产生的离子流场,将地电位升高作为第1类边界条件,应用模拟电荷法,建立了考虑地电位升高影响的HVDC输电线路下方离子流场计算模型。计算结果表明,在不计及地电位下,与可查询的文献相比,计算结果与其基本一致。计及地电位下,地面离子流密度与电场的值分别有所增大,同时分析了不同地电位升高值、导线高度及极间距下,地电位的变化对超高压输电线路地面合成电场以及离子流场的影响。展开更多
文摘We present a study of the ion stopping power due to free and bound electrons in a warm dense plasma.Our main goal is to propose a method of stopping-power calculation expected to be valid for any ionization degree.The free-electron contribution is described by the Maynard–Deutsch–Zimmerman formula,and the bound-electron contribution relies on the Bethe formula with corrections,in particular taking into account density and shell effects.The results of the bound-state computation using three different parametric potentials are investigated within the Garbet formalism for the mean excitation energy.The first parametric potential is due to Green,Sellin,and Zachor,the second one was proposed by Yunta,and the third one was introduced by Klapisch in the framework of atomic-structure computations.The results are compared with those of self-consistent average-atom calculations.This approach correctly bridges the limits of neutral and fully ionized matter.
文摘超高压直流(high voltage direct current,HVDC)输电线路离子流场的计算对于输电线路的设计具有重要意义。然而考虑地电位升高的地面离子流场的计算却很少,为此,在Deutsch假设的基础上,为了研究计及地电位升高时HVDC输电线路产生的离子流场,将地电位升高作为第1类边界条件,应用模拟电荷法,建立了考虑地电位升高影响的HVDC输电线路下方离子流场计算模型。计算结果表明,在不计及地电位下,与可查询的文献相比,计算结果与其基本一致。计及地电位下,地面离子流密度与电场的值分别有所增大,同时分析了不同地电位升高值、导线高度及极间距下,地电位的变化对超高压输电线路地面合成电场以及离子流场的影响。
