The behavior of beams with deferential initial energy spread in the accelerating section and focusing system has been described using the beam envelope model and its code.

• 为了分析不同能散度的入射束流在直线感应加速器加速段和聚焦段的行为,利用束包络计算模型进行了计算考察,给出束流不同能散度对聚焦焦斑造成模糊范围的大小。