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The
Linear Collider main beam is always accompanied by a beam halo, which includes
particles in outside regions of phase space that can impinge on beam-line
apertures and, via their consequent electromagnetic showers, produce secondary
particles. The secondary particles
in turn will track down the beam-line and cause backgrounds both in the
beam-line itself and also in the detector at the interaction point.
Estimates of the level of backgrounds require full simulations of the
physics processes involved, combined with accurate particle tracking tool.
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