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The Action and Phase Jump (APJ) analysis had been successfully used to obtain magnetic errors in RHIC from orbit data, and preliminary studies using this method has been done in the LHC. Analyses in the LHC show significantly higher noise levels than for the RHIC case due to a bigger bandwidth of the LHC BPMs. Efforts to reduce the noise level like taking advantage of the thousands of turns provided by the LHC BPM system (in contrast with the few orbits used in RHIC) have been done, but there is still a possibility to reduce it further by using filters. In this work, we describe the design of a band-pass filter on LHC simulated orbits. Normal and skew quadrupole errors (A1 and B1) are introduced in the lattice and recovered after multiple turns of the particles, using the APJ analysis. Gaussian and uniform noise were added to the orbits and the band-pass filter was applied to them. Results show that the band-pass filter around the accelerator tunes reduces significantly the uncertainty on the determination of A1 and B1, when the filter is optimized by changing its bandwidth. This optimization as well as other trials like the use of a low-pass filter are presented in this work.
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