磁铁安装误差对束流轨道的影响

Effects of alignment errors on the orbit function in HLS storage ring

采用数值方法系统地分析了HLS储存环磁铁安装误差对束流闭轨的影响,发现造成闭轨畸变的主要原因是四极铁在横向位置的安装误差和二极铁在束流方向的旋转,并给出了它们的放大因子;同时对横向发射度的耦合进行了研究,发现造成垂直方向发射度增加的主要原因是闭轨畸变;在综合考虑各种误差的情况下,提出了需要对各种磁铁进行进一步准直的要求。

The orbit functions for HLS storage ring have been studied using the simulation code MAD. The effects of alignment errors of the quadrupole, dipole magnets were simulated. The effects of these errors on the orbit distortion and coupling are then graphically analyzed to show the rms spread of the functions. The studies show that the most significant closed orbit distortion was caused by displacement of the quadrupole magnets, and the amplification factors are presented, while providing the opportunity of future upgrade in alignment. In addition, the coupling between the horizontal and vertical emittance is analyzed, and the main coupling is due to the orbit distortion.