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介绍了北京大学重离子物理研究所2.45GHz袖珍永磁微波离子源引出系统的一项改进,即在距该离子源永磁环9cm处加一个长为10cm的永磁透镜。通过计算机模拟和实际测量,对增加此透镜前后比较了磁场分布的变化。模拟计算和实验结果表明,永磁透镜产生的磁场可以有效地聚焦引出的束流,减小引出束流的束斑尺寸。与电磁螺线管透镜相比,该项改进简化了束流传输系统,节省了电功率,并有利于改善离子源区的真空。
An improvement of 2.45GHz miniature permanent magnet microwave ion source extraction system at Peking University was introduced, that is, a permanent magnet lens with a length of 10cm was added at a distance of 9cm from the permanent magnet ring of the ion source. Through computer simulation and actual measurement, the magnetic field distribution changes were compared before and after adding this lens. The simulation results and experimental results show that the magnetic field generated by the PM lens can effectively focus the outgoing beam and reduce the beam spot size of the outgoing beam. Compared with electromagnetic solenoid lenses, this improvement simplifies the beam delivery system, saves electrical power and helps to improve the vacuum in the ion source region.