Multiturn (or turn-by-turn) data acquisition has proven to be a new source of direct measurements for Twiss parameters in storage rings. On the other hand, closed-orbit measurements are a long-known tool for analyzing closed-orbit perturbations with conventional beam position monitor (BPM) systems and are necessarily available at every storage ring. This paper aims at combining the advantages of multiturn measurements and closed-orbit data. We show that only two multiturn BPMs and four correctors in one localized drift space in the storage ring (diagnostic drift) are sufficient for model-independent and absolute measuring of $\beta$ and $\phi$ functions at all BPMs, including the conventional ones, instead of requiring all BPMs being equipped with multiturn electronics.

• Received 23 December 2010

DOI:https://doi.org/10.1103/PhysRevSTAB.14.062802

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© 2011 American Physical Society