备选ILC最终聚焦光学结构的研究
Study of alternative ILC final focus optical configurations
摘要：
ILC最终聚焦系统（FFS）的作用是将光束缩小到IP处满足ILC亮度目标所需的尺寸。目前的最终焦点设计在水平和垂直平面上都能进行完美的色度校正。在此基础上，研究了一组可供选择的光学结构，其中增加了IP处的水平光束尺寸，同时减小了垂直光束尺寸，目的是减少光束辐射。必须考虑由于沙漏效应引起的亮度降低，因为在这种情况下，β y */σ z * 变得小得多。使用Guineapig++的束-束相互作用模拟进行评估。减小的束团长度用于确保所获得的亮度不低于ILC原始（标称）配置的亮度。
英文摘要：
The role of the ILC final focus system (FFS) is to demagnify the beam to the sizes at the IP required to meet the ILC luminosity goals. The current design of final focus performs perfect chromaticity correction in both horizontal and vertical planes. Based on this design a set of alternative optical configurations were studied in which the horizontal beam size at the IP is increased while at the same time the vertical one is decreased, with the goal of reducing beamsstrahlung emission. Luminosity reduction due to the hour glass effect must be considered because betay*/sigmaz* becomes much smaller in this case. The beam-beam interaction simulation by Guineapig++ was used for evaluation. Reduced bunch lengths are used to make sure that the obtained luminosities are not lower than those of the ILC original (nominal) configuration.
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