Component misalignments are an important source of emittance dilution in the main linac of the International Linear Collider (ILC). The impact of static uncorrelated alignment errors has been widely studied with various simulation codes and several beam based alignment algorithms. For a realistic scenario one has to take into account that the survey and alignment process will introduce correlations between the component errors. In the present paper we study the performance of the Dispersion Matched Steering (DMS) technique for the case of such correlated misalignments. Different models for the correlations are investigated including a model characteristic of the alignment and survey technique envisaged for the ILC [1] which has been implemented into the Merlin C++ library [2] based package ILCDFS [3]. In addition to the initial static errors, dynamic errors due to ground motion will produce an emittance growth with time. For this case we have also investigated the stability of DMS tuning over time.
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机译：成分未对准是国际线性撞机（ILC）主线圈中的重要膨胀稀释来源。静态不相关对准误差的影响已被广泛研究了各种仿真代码和几个基于光束的对准算法。对于一个现实的方案，必须考虑到调查和对齐过程将在组件错误之间引入相关性。在本文中，我们研究了对这种相关性错位的情况的分散匹配转向（DMS）技术的性能。研究了相关模型，包括对ILC [1]设想的对准和测量技术的模型特征，该方法已经在Merlin C ++库[2]的包ILCDFS [3]中。除了初始静态误差之外，由于地面运动引起的动态误差将产生带有时间的可发射增长。对于这种情况，我们还调查了DMS调整随时间的稳定性。
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