Abstract
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 $\ensuremath{\beta}$ and $\ensuremath{\varphi}$ functions at all BPMs, including the conventional ones, instead of requiring all BPMs being equipped with multiturn electronics.
Highlights
Measuring optical functions in the storage rings is an essential part of beam diagnostics
The necessary condition for the presented method is that the optical parameters bk, c k at the positions of two horizontal dipole correctors can be determined with multiturn beam position monitor (BPM) data
A proof-of-principle experiment has been described and implemented which shows that modelindependent and fast measurements of linear beam Twiss parameters are possible with much less hardware effort than usually needed for retrieving this information
Summary
Measuring optical functions in the storage rings is an essential part of beam diagnostics (see Ref. [1] for a recent review). Measuring optical functions in the storage rings is an essential part of beam diagnostics [2]), dependency on the quality of the lattice model of the storage ring, and high financial effort if many multiturn beam position monitors (BPMs) are used. A cost-effective, model-independent, fast, and nondisruptive method for determining the function absolutely at all BPMs along the ring is presented. It employs a combination of only two multiturn-capable BPMs and two (only horizontal motion) respectively four (full transverse motion) correctors for small closed-orbit perturbations. A proof of principle of this new method is given via measuring the horizontal and ’ function. An appendix with the generalization of the presented method to full transverse motion and betatron coupling is provided
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