Bending a Beam to Significantly Reduce Wakefields of Short Bunches
  A method of significantly reducing wakefields generated at collimators is proposed, in which the path of a beam is slightly bent before collimation. This is applicable for short bunches and can reduce the wakefields by a factor of around 7 for present day free electron lasers and future colliders. 
Jonathan Gratus and Michael R. Ferris
physics.acc-ph