ILC与head-on collisions相互作用区域的设计
Design of an interaction region with head-on collisions for the ILC
摘要：
国际直线对撞机（ILC）的基线配置，其中包括两个IR有限交叉角（2和20 mrad）的相互作用区（IR）与迎面碰撞被认为是一种替代方案。虽然对光束提取更具挑战性，但正面方案受到实验的青睐，因为它允许更方便的检测器配置，特别是在前向区域。通过水平地分离e+和e-束，首先通过在其LEP标称场下操作的静电分离器，然后使用最终聚焦束线的散焦四极杆，来重新审视迎面提取的光学器件。以这种方式，保护隔膜磁体免受束辐射功率的影响。新优化的最终焦点和提取光学，包括碰撞后诊断的第一眼。寄生碰撞的影响，导致稳定的碰撞参数的区域。沿提取元件的中断束和beamstrahlung光子损失计算。
英文摘要：
An interaction region (IR) with head-on collisions is considered as an alternative to the baseline configuration of the International Linear Collider (ILC) which includes two IRs with finite crossing-angles (2 and 20 mrad). Although more challenging for the beam extraction, the head-on scheme is favoured by the experiments because it allows a more convenient detector configuration, particularly in the forward region. The optics of the head-on extraction is revisited by separating the e+ and e- beams horizontally, first by electrostatic separators operated at their LEP nominal field and then using a defocusing quadrupole of the final focus beam line. In this way the septum magnet is protected from the beamstrahlung power. Newly optimized final focus and extraction optics are presented, including a first look at post-collision diagnostics. The influence of parasitic collisions is shown to lead to a region of stable collision parameters. Disrupted beam and beamstrahlung photon losses are calculated along the extraction elements.
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