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周期永磁磁场导引环形强流电子束研究
Propagation of annular IREB in periodic permanent magnetic (PPM) field
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摘要: 利用磁场有限元法,计算了周期性布置的永磁铁内的磁场;利用流体模型分析了作用在束电子上的力并导出了改进Matheiu函数形式的径向力方程;利用2.5维PIC程序研究了束传输的物理过程.计算发现强流相对论电子束的稳定传输与束等离子体密度、束平衡位置、磁场的强度、磁场周期长度等有关.研究认为利用周期性永磁场导引数kA的环形电子束,使之稳定传输是可能的.Abstract: The feasibility of propagating annular IREB in periodic permanent magnetic (PPM) field is studied. The PPM field is calculated first using the finite element magnetic method (FEMM). Then forces acting on IREB's electron in such magnetic field are analyzed by fluid model and the radial force equation in modified Mathieu function form is drawn. Finally a 2.5-D particle in-cell (PIC) simulation code is used to investigate the physical process of the IREB's propagation. It is found that the stable propagation for IREB is relative to not only the beam plasma density and it's equilibrium position but also the magnetic field intensity and it's space period length. The conclusion is drawn that several kA intense annular electron beam can propagate stably in a guiding PPM.
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