Abstract
We propose a new method to measure and correct linear optics and coupling for storage rings with beam position monitor (BPM) data. Two correctors in each transverse plane are used to modulate the closed orbit in an appropriate pattern to sample the linear optics. The orbit modulation data are fitted to the lattice model in a similar manner as the usual method of fitting the orbit response matrix. The closed orbit modulation measurements can be done much faster, and the number of sample points is not limited by the number of correctors. The method also has a number of advantages over methods that rely on turn-by-turn BPMs. A simulation is done to demonstrate the working principles of the method.
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