Abstract
The vertical beam profile distortions induced by wakefield effects in linear colliders (the so-called banana effect) generate a beam-beam instability at the collision point when the vertical disruption parameter is large. We illustrate this effect in the case of the TESLA linear collider project. We specify the tolerance on the associated emittance growth, which translates into tolerances on injection jitter and, for a given tuning procedure, on structure misalignment. We look for possible cures based on fast orbit correction at the interaction point and using a fast luminosity monitor.
Highlights
In order to obtain the highest luminosity, the beam pae era+m;etecrosllaitdtehres,ianrteerpacutsihoendptoointht e(IPli)moitf high-energy linear of tolerable beamstrahlung and beam-beam background
The sensitivity of the luminosity to offset and angle errors is shown in Fig.1: it is enhanced by a factor 5 for small offsets and by a factor 10 for small angles with respect to the simple geometric factor
L ity 0, which itself roughly scales as the square root of the inverse of the vertical emittance given by Eq
Summary
In order to obtain the highest luminosity, the beam pae era+m;etecrosllaitdtehres,ianrteerpacutsihoendptoointht e(IPli)moitf high-energy linear of tolerable beamstrahlung and beam-beam background. = beam-beam interaction is very intense even for flat beams twbiucinathlchldailrsegrnuegpatthsiopnezcpttaorratahtmieoevRteerrtiDcayl ,xb=deeafimy n.-ebAdecaacmsorftdhoiecnagrlallyteionthgoethfvtfehyre-, and given by. The sensitivity of the luminosity to offset and angle errors is shown in Fig.: it is enhanced by a factor 5 for small offsets and by a factor 10 for small angles with respect to the simple geometric factor. This optimisation of the IP parameters into a high disruptive regime is justified by the ability of the fast inter-bunch orbit feed-
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