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利用有限元程序SUPERFISH计算求解了同轴永磁Halbach结构磁路的磁场,并推导出该磁场位形磁感应强度各分量的近似表达式.利用流体模型分析了作用在电子束上的力并导出了改进马丢方程形式的径向力平衡方程,给出了平衡条件;利用2.5维全电磁粒子模拟程序研究了强流环形电子束在该周期系统中传输的物理过程.计算得出强流相对论电子束的稳定传输与电子束电流,电子束厚度,磁场强度,电子束入射角度等因素有关.分析认为利用同轴永磁Halbach结构磁路导引数KA的环形电子束,并使之稳定传输是可能的.同时该磁场聚焦形式也为Ubitron中的束-波相互作用提供了一个作用机制.
The finite element program SUPERFISH was used to calculate the magnetic field of the coaxial permanent magnetic Halbach structure, and the approximate expression of each component of the magnetic flux density in the magnetic field was deduced. The force acting on the electron beam was analyzed by the fluid model, The equations of equilibrium for the equations of force in the form of the Horseot equation are modified and the equilibrium conditions are given. The physical process of the transmission of a strong annular toroidal electron beam in the periodic system is studied using a 2.5-dimensional full electromagnetic particle simulation program. The steady transmission of the beam is related to the beam current, the electron beam thickness, the magnetic field intensity, the incident angle of the electron beam, etc. It is considered that the annular electron beam guided by the magnetic flux path KA of the coaxial permanent magnet Halbach structure is stabilized and transmitted Possible.At the same time, the magnetic field focused mode also provides a mechanism for the beam-wave interaction in Ubitron.