Fringing Field Effects of Nonsymmetrical Large Angle Rectangular Type Septum

切割磁铁是环型加速器常用的注入引出元件之一,其在非偏转方向上对束流的影响,直接关系到注入引出束流的轨道匹配。对大角度非对称矩形切割磁铁杂散磁场的影响进行了分析,指出其在非偏转方向上对束流有一定的偏转量,而且此偏转量是不可忽略的。另外,介绍了HIRFL-CSR主环注入切割磁铁对注入轨道匹配的影响,并提出了一种补偿方案,进行了初步的补偿。As important components, magnet septums are often used to separate beams inside and outside ring accelerators. If the septum has bending effect on non-intended bending direction, it will influence orbit matching. The fringing field effects of non-symmetrical large angle rectangular type septum is investi-gated in this paper. In some condition, the non-intended bending can＇t be neglected. One of the method to compensate the non-intended bending of septum is introduced in CSRm injection line.中国科学院百人计划资助项目（0313010BR0）; 国家九五大科学工程冷却储存环资助项目（06HIRFL200