In this paper, we give preliminary designs of beam polarization manipulations by inserting three different types of insertions in the Circular Electron–Positron Collider (CEPC) at center-of-mass energies of 91 GeV (Z-pole). With the wigglers in the collider ring, we can obtain 5% transverse polarization in 1.1 h for the precise energy measurement. To overcome depolarization effects as the beam energy rises from 10 GeV to 45.5 GeV in the booster ring, Siberian snakes based on helical magnets are adopted. Finally, for longitudinally polarized beam collisions, a schematic design of spin rotators based on solenoids in the collider ring is studied.

中文翻译：

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CEPC Z 极极化设计研究

在本文中，我们通过在质心能量为 91 GeV 的圆形电子-正电子对撞机 (CEPC) 中插入三种不同类型的插入物，给出了光束偏振操纵的初步设计（Z-极）。使用对撞机环中的摆动器，我们可以在 1.1 小时内获得 5% 的横向极化，用于精确的能量测量。为了克服助推环中光束能量从 10 GeV 上升到 45.5 GeV 时的去极化效应，采用了基于螺旋磁体的西伯利亚蛇。最后，针对纵向偏振光束碰撞，研究了基于对撞环中螺线管的自旋旋转器的示意图设计。