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Fast external noise, which gives fluctuation into the beam orbit, isdiscussed in connection with beam-beam effects. Phase noise from crab cavitiesand detection devices (position monitor) and kicker noise from the bunch bybunch feedback system are the sources. Beam-beam collisions with fast orbitfluctuations with turn by turn or multi-turn correlations, cause emittancegrowth and luminosity degradation. We discuss the tolerance of the noiseamplitude for LHC and HL-LHC.

Beam-beam effects under the influence of external noise