Application of model-independent analysis to PEP-II rings

Model independent analysis (MIA), which employs statistical methods to reveal one-micron charge-induced centroid changes in pulse-by-pulse beam-position-monitor (BPM) measurements at the SLAC linac has been extended to storage rings, and is here applied at PEP-II to analyze transverse motion. The beam is resonantly excited by a shaker in the horizontal and vertical directions and 2050 consecutive-turn measurements of all BPMs are buffered. Four high-precision linearly-independent orbits are determined. Local Green's functions specified by the local transfer matrix components R12, R34, R32, and R14 are extracted from these orbits and fitted with the model lattice using an SVD-enhanced method. The BPM gain and cross-plane coupling along with 1 normal- and 1 skew-quadrupole strength are determined per single-view BPM.