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Multiturn / turn-by-turn data acquisition is a new source for Twiss parameter determination in storage rings, while closed-orbit measurements are a long-known tool for diagnostics with conventional low-frequency beam position monitor (BPM) systems, being available at almost every storage ring. The presented method aims to join the advantages of multiturn and closed-orbit measurement methods. For uncoupled optics, there are only two correctors per oscillation plane and two multiturn BPMs needed in one drift space in the storage ring for model-independent measurement of beta and betatron phase functions at all BPMs in the ring, including conventional ones. This is a cost-effective alternative to the exclusive usage of multiturn BPMs in a storage ring, resulting in the same amount of information. This method can also be extended to include betatron coupling. In addition, we describe a possible experimental setup needed for multiturn data acquisition using a bunch-by-bunch feedback system. By applying an uncritical coherent excitation to coupled bunch modes, the accuracy of the multiturn data acquisition may be significantly improved, enabling the use of smaller drift spaces.
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