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如图1所示的理想的螺旋扇结构中,粒子除受到与直边扇形类似的磁场沿方位角调变形成的分量Bθ与离子速度的径向分量作用产生的托马斯轴向聚焦力外,还受到两个额外的聚焦力——螺旋扇磁极边缘弯曲形成的方向沿着径向或反径向(随螺旋线外凸或内凹)交替变化的径向分量Br′与
In the ideal helical fan structure shown in Fig. 1, in addition to the Thomas axial focusing force caused by the radial component of the component Bθ and the ion velocity formed by the azimuth modulation of a magnetic field similar to the straight edge sector Subject to two additional focusing forces - the radial component Br ’alternating in the radial or anti-radial direction (convex or concave with the helix) in the direction in which the edges of the spiral fan poles are curved and