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
misalignments. We look for possible cures based on fast orbit correction at the
interaction point and using a fast luminosity monitor. |
