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A system was developed for bunch-by-bunch detection of transverse proton andantiproton coherent oscillations based on the signal from a singlebeam-position monitor (BPM) located in a region of the ring with largeamplitude functions. The signal is digitized over a large number of turns andFourier-analyzed offline with a dedicated algorithm. To enhance the signal, thebeam is excited with band-limited noise for about one second, and this wasshown not to significantly affect the circulating beams even at highluminosity. The system is used to measure betatron tunes of individual bunchesand to study beam- beam effects. In particular, it is one of the maindiagnostic tools in an ongoing study of nonlinear beam-beam compensationstudies with Gaussian electron lenses. We present the design and operation ofthis tool, together with results obtained with proton and antiproton bunches.

Bunch-by-bunch detection of coherent transverse modes from digitized single-bpm signals in the Tevatron