In this article we present the measurement and correction of the chromatic coupling in the LHC. The transverse coupling is calculated from turn-by-turn data, exciting the beam with an ac dipole. By adjusting the momentum relative to the reference energy and repeating the measurement, we obtain the transverse coupling dependency on momentum. The measurements are compared to the predictions from the magnetic model, and show good agreement. We describe the algorithm used to calculate the corrections, which are performed using skew sextupoles in the LHC lattice. A reduction in the chromatic coupling of a factor $2.5ifmmodepmelseextpmi{}0.4$ for beam 1 and 1.6 $ifmmodepmelseextpmi{}0.3$ for beam 2 was obtained after applying the corrections.
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机译：在本文中，我们介绍了LHC中色度耦合的测量和校正。横向耦合是通过匝道数据计算得出的，并用一个交流偶极子激发光束。通过相对于参考能量调整动量并重复测量，我们获得了对动量的横向耦合依赖性。将测量结果与磁性模型的预测结果进行比较，并显示出良好的一致性。我们描述了用于计算校正的算法，该算法使用LHC晶格中的斜六极杆执行。光束1的色度耦合降低了$ 2.5 ifmmode pm else textpm fi {} 0.4 $，光束2降低了1.6 $ ifmmode pm else textpm fi {} 0.3 $应用更正。
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