太赫兹自由电子装置注入束流输运线的束团有着较长的尾部.在束团尾部能散较大的粒子由输运线中的能量狭缝加以剔除,仅保留头部满足出光要求的粒子输入波荡器.利用Elegant的模拟计算表明在目前采用的输运线设计可以将束团有效部分的粒子完整地传输至波荡器.输运线所采用的磁铁的加工和安装误差会导致束流轨道的畸变,需要利用校正磁铁对束流的偏移加以校正.利用AT for MATLAB仿真计算结果表明,合理选择校正线圈的布局可以有效地校正束流偏差.

The inject beam of the beam transfer line of THz-FEL device has a long tail since there is no beam cutting device,due to the space limitation.A slit was set in the transfer line to cut the tail.Only the electron at the head of the beam which satisfy the requirement of FEL was left.The calculation using Elegant indicated that the transfer line could transmit the effective part of the beam to the exit.The orbit distortion caused by tolerance of magnets should get reduced to a reasonable level.The calculation using AT for MATLAB indicated that the orbit distortion was minimized ultimately after corrections.