中文摘要：

为了使国际未来直线对撞机达到高的亮度，对撞机的阻尼环必须要有很小的自然发射度。同时，阻尼环要有很大的接收度来接受来自正电子注入系统的大能散、大发射度的正电子束团．对于磁聚焦结构的设计来说，同时达到以上要求是一件很有挑战性的工作．为了降低ILC阻尼环的造价采用修正的FODO结构设计了可以满ILC要求的阻尼环备用Lattice，并使四极磁铁的数量比起ILC阻尼环BCD设计减少了一半。

英文摘要：

The ILC damping rings should provide beams with very low natural emittances for the linear collider to reach the required luminosity, and at the same time, the damping rings also need to have a large acceptance to ensure good injection efficiency for high emittance, high energy spread beam from the positron source. Meeting the above requirements is a real challenge for the ILC damping ring lattice design. In order to reduce the cost for ILC damping rings, an alternative lattice different from the baseline configuration design has been done with modified FODO cells, and the total quadrupole number has been reduced by half. The new lattice has been optimised to have good dynamic apertures.