在线同位素分离器束流光学特性研究

在线同位素分离器系统是用于研究远离β稳定线的短寿命核素的有效工具.本文主要对ISOLDE型(55o)在线分离器的束流光学系统作了详细介绍,通过分析影响磁铁质量分辨本领的因素,指出把单透镜和四极透镜组合在一起使用可达到既提高分辨本领又不损失束流的要求.此外,根据CARR-ISOL的磁铁参数计算了不同影响因素下磁铁质量分辨本领及束斑水平宽度,发现在电源稳定度越高,加速电压越高,离子源归一化发射度越小时,磁铁的质量分辨率越高.

Analysis on the Characteristic of the Beam Optics System of an On-line Isotope Separator

The isotope separator used on-line is the most effective and powerful facility for systematically studying short-life nuclides which are far away from the line of beta stability.An introduction of the beam optics system of ISOLDE type with a 55o deflection of beam is presented in this paper.According to the factors affecting the mass resolving power of the analyzing magnet,the requirement of increasing the resolution of the system and reducing the loss of beam can be satisfied with the combination of quadruple doublets and einzellens.In addition,by calculating the mass resolving power of the analyzing magnet and the horizontal dimension of beam in different influence factors on the magnet of CARR ISOL,a conclusion can be drawn that the resolution of the system will be higher with better stability of the supply powers,higher voltage for accelerating and smaller normalize beam emittances.