北京慢正电子强束流磁场输运系统设计研究  

Design of the Magnetic Field System for Beijing Intense Slow Positron Beam Transportation

作　　者：曹兴忠[1] 王宝义[2] 于润升[2] 魏存峰[1] 薛德胜[1] 魏龙[2] 

机构地区：[1]兰州大学磁学与磁性材料教育部重点实验室,兰州730000 [2]中国科学院高能物理研究所核分析技术重点实验室,北京100039

出　　处：《高能物理与核物理》2004年第5期560-563,共4页High Energy Physics and Nuclear Physics

基　　金：国家自然科学基金 ( 1992 70 0 1);中国科学院大型科学仪器专项经费资助~~

摘　　要：针对基于北京正负电子对撞机的慢正电子强束流系统对输运磁场的设计要求 ,本文对不同规格的磁场输运线圈模型、长螺线管端口处磁场的补偿以及地磁场和弯管道对正电子束流的影响等进行了计算 ,提出适用于本系统传输慢正电子束流的输运磁场分布、补偿线圈、调整线圈的加工参数 ,计算表明 ,系统的总体磁场不均匀度小于 10髎 .实际运行束流测试表明 ,所设计的磁场系统能够很好的将慢正电子束流输运到约 16m远的样品测量室 ,慢正电子束斑尺寸基本没有变化 ,满足慢正电子束流系统的设计要求 .A slow positron beam with intensity of 106e+/s produced by the Beijing Electron-Positron Collider (BEPC) is transported by the 100 Gauss magnetic field system with the oscillation less than 10. In this paper, the distributions of magnetic field at target chamber, sample chamber and Penning-Trap storage are calculated systematically, and the parameters of solenoidal coils and steering coils are calculated respectively. The correction coils are designed to compensate the affect induced by the geomagnetic field and the bent tube. Results of electron beam experiment show that the positron beams are transported to sample chamber with the beam spot size basically unchanged, and the magnetic field distributions satisfy to the requirement of the slow positron beam system.

关 键 词：慢正电子束 束流输运 磁场分布 补偿线圈 正负电子对撞机 毕奥-萨伐尔定律 

分 类 号：O572.2[理学—粒子物理与原子核物理]