LHC TI2/TI8 TL Stability Check RUN II

This document presents a study of the stability of transfer lines (TL) TI2 and TI8 from the SPS to the LHC during RUN II. It shows the simulation process performed with MAD-X (Modelling Accelerator Dynamics software), to get familiar with TL optics and Model Independent Analysis (MIA). It carries out the analysis of real data from the LHC LoggingDB across the 4 year period of RUN II and the obtained results are then compared with the simulated ones aiming to find a source match with the element causing the trajectory oscillations. Evaluating results from RUN II (2015-2018) with those from RUN I (2008-2012), we observed an increased number of Eigen Modes above noise and hence suggesting the presence of more than one source. During 2017, a single month at each TL was identified with similar characteristics to the data from RUN I, making the MSE kicker a solid candidate for those periods. Further analysis is still needed to conclude on RUN II performance with respect to the last years of RUN I (after Power Converter Improvements).