放射性次级束流分离器(HFRS)是强流重离子加速器装置(HIAF)上开展放射性次级物理研究的重要装置。HFRS是飞行时间型(PF)碎片分离器，具有大磁刚度、大接受度、大孔径磁铁以及高动量分辨的特点。HFRS采用Bρ-ΔE-Bρ方法纯化弹核碎裂或裂变反应产生的放射性核素，是开展高精度储存环内实验及环外实验研究的重要工具。主要介绍HFRS分离纯化奇异核的能力，采用MOCADI程序模拟单降能器与双降能器下典型弹核碎裂反应和裂变反应中粒子的鉴别和纯化。模拟结果表明: HFRS具有很好的消色散和聚焦特性，对于弹核碎裂反应中轻核的分离采用单降能器系统即可得到很好的纯化效果; 而弹核碎裂反应中重核的分离则需采用双降能器系统才可得到很好的纯化效果; 对于裂变反应，由于裂变反应的能散较大，则在采用双降能器系统时也仅仅能得到一定的纯化效果。

Superconducting fragment separator HFRS is the significant facility to study the radioactive physics in high intensity heavy-ion accelerator facility (HIAF). HFRS is an in-flight fragment separator, which has many unique features, such as large magnetic rigidity, large acceptance, big magnet aperture, high momentum resolving power and so on. HFRS uses the Bρ-ΔE-Bρ method to separate the exotic nuclei produced by projectile fragmentation or fission within several hundred nanoseconds, which are used to investigate the high precision in-ring experiments or out-ring experiments. This presentation mainly introduces the separation performance of HFRS. It uses MOCADI program to simulate the purification of fragments in projectile fragmentation and fission products with one degrader stage or two degrader stages. The simulation results show that HFRS has good achromatic and focusing properties, and it can efficiently isolate and purify light nuclides via fragmentation with one degrader stage and it has a certain separation effect of heavier nuclides with two degrader stages. The momentum spread of fission is much higher than fragmentation, so the fission products separation effect of HFRS with two degrader stages is not as good as the fragment purification effect with single degrader stage.