周期永磁聚焦系统永磁环横向场降低方法

Method for reducing transverse field of permanent magnet ring in periodic permanent magnet focusing system

行波管周期永磁聚焦系统永磁环的横向场主要是由磁取向偏角引起的。为了减小磁取向偏角从而降低横向磁场,结合永磁聚焦系统的磁路结构及磁场分布,从成型工艺、加工工艺等方面探索了减小磁取向偏角的方法和措施,包括优化成型模具结构从而改善模腔取向场分布和磁环加工工艺。结果表明,这些措施在减小磁取向偏角从而抑制横向场方面具有较好效果,制备出横向场与轴向峰值场之比小于3%的低横向场磁环,较好地满足了应用要求。

The transverse field of the permanent magnet ring in traveling wave tube periodic permanent magnet focusing system is mainly caused by the magnetic orientation declination angle.In order to reduce the magnetic declination angle and thus reducing the transverse field,combining the magnetic circuit structure and magnetic field distribution of permanent magnet focusing system,the methods and measures to reduce the magnetic orientation declination angle are explored from the aspects of molding technology and processing technology,including optimizing the molding die structure to improve the distribution of mold cavity orientation field and processing technology of magnetic ring.The results show that these measures have good effects in reducing the magnetic orientation declination angle and thus inhibiting the transverse field.The low transverse field magnetic ring with the ratio of transverse field to axial peak field less than 3%is prepared,which meets the application requirements well.