中文摘要：

系统分析了粒子在分离作用射频四极场（RFQ）加速结构中的运动，导出了极限流强与动力学参数的关系,存在于分离作用RFQ膜片加速间隙处的加速电场，较传统的RFQ能更加有效地加速带电粒子,四杆电极之间的射频四极场，对粒子的横向具有聚焦或者散焦作用，通过适当选取粒子动力学参数可以保证粒子在分离作用RFQ中横向和纵向运动的稳定性．

英文摘要：

The particles＇ motion in separated function radio frequency quadrupole （SFRFQ） accelerator is analyzed in this paper. Compared to conventional radio frequency quadrupole accelerator, the SFRFQ structure has higher accelerating efficiency, and the particles are focused or defocused by the quadrupole outside the diaphragms. The relation between limiting current and dynamic parameters has been deduced, so the transverse and longitudinal stability of particles in SFRFQ is ensured by selecting proper dynamic parameters.