CSRe 分子离子研究装置低能传输线物理设计

摘要

The design of a low energy beam transport system for CSRe molecular ion research facility was presented .The electric field distribution of the 150 kV high voltage accelerator was simulated by Poisson/Superfish code .The results show that the electric field strengths of various region spaces were far lower than the value of breakdown electric field . The transmission of the molecular ion beam from the ion source was simulated by Beampath in the high voltage accelerator .The beam envelope indicates that the electric field of acceleration section has a strong focusing effect on the molecular ion beam ,and the beam size is small at the end of the accelerate tube .The Trace-3D code was used to design the magnetic analysis system with high resolution and the matching section for injecting into RFQ accelerator . Finally , through the simulation , the molecular ion beam with the mass number of 150 was analyzed and the injection matching of the RFQ accelerator by one triplet quadrupoles was achieved .%本文完成了CSRe分子离子研究装置低能传输线的物理设计。采用 Poisson/Superfish软件对150 kV倍压型高压加速器的电场分布进行了模拟，结果显示，加速器各区域空间电场强度均远低于击穿电场强度限值。利用Beampath程序对离子源引出的分子离子束在高压加速器中的传输进行了模拟，束流包络显示，加速区电场对分子离子束具有较强的聚焦作用，加速管出口束斑尺寸较小。采用T race-3D程序设计了高分辨能力的磁分析系统和 RFQ加速器的注入匹配段。通过Beampath程序的模拟，分析出了质量数为150的分子离子束，并由三单元四极透镜实现了分析束流与直线加速器 RFQ的注入匹配。