Combining Methods for Localization of Linear Focusing Errors

The primary objective of accelerator tuning is to correct its linear optics. This involves adjusting a large set of parameters, such as quadrupole lens gradients and alignment errors, as well as addressing various calibration errors in beam position monitors (BPMs) and other components. These errors can significantly impact the accelerator performance. Using the full set of parameters might reduce the correction efficiency. Typically, it is advisable to prioritize the correction of large errors, as their localization can enhance the overall efficiency of the correction process. The task of error localization involves identifying the locations of potential error sources, along with their type. This paper explores and compares several commonly used error localization methods, using the SKIF model to test and evaluate their efficiency. Employing multiple methods enables cross-validation of the results obtained from the error localization process. The combined results from several localization methods improve the overall accuracy of error localization.
Comment: 10 pages, 9 figures, fix typos, fix refs, minor text correction, improve figures