均匀和边界清晰的离子束斑对一些高功率束流应用上的需求极为迫切,它对于提高靶的寿命和束流利用效率极为重要。目前国际上提出了3种束斑均匀化器件,包括八极磁铁、极片磁铁和台阶场磁铁。我们提出了新型的用于束流均匀化的异型四极铁和六极聚焦磁铁。异型四极铁在束流中心附近插入一对屏蔽磁极,形成1个零场区域,不对束流产生作用,远离 The need for some high-power beam applications is extremely pressing for uniform and well-defined ion beam spots, which are crucial for improving target life and beam utilization efficiency. Currently, three kinds of beam spot homogenization devices are proposed in the world, including octupole magnets, pole piece magnets and step field magnets. We propose a new type of shaped quadrupole and hexapole focusing magnet for beam homogenization. The special-shaped quadrupole inserts a pair of shielding poles near the center of the beam to form a zero-field region, which does not affect the beam and is far away from the beam