= Beam mixing
<Beam mixing> changes sample membership between turns through revolution-time differences. Repeatedly correlated samples and thermal <noise> limit <stochastic cooling>.<Stochastic Cooling and the Accumulation of Antiprotons by Simon van der Meer>[Section 5, p.295, Mixing and thermal noise, Eqs.(3)–(4)]{ref}
Fresh samples help across turns; losing pick-up–kicker correlation hurts. Useful <feedback gain> therefore depends on <bandwidth>, delay, beam dynamics and <signal-to-noise ratio>.
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