  The beam transport system between accelerator and patient treatment location
in a particle therapy facility is described. After some general layout aspects
the major beam handling tasks of this system are discussed. These are energy
selection, an optimal transport of the particle beam to the beam delivery
device and the gantry, a device that is able to rotate a beam delivery system
around the patient, so that the tumour can be irradiated from almost any
direction. Also the method of pencil beam scanning is described and how this is
implemented within a gantry. Using this method the particle dose is spread over
the tumour volume to the prescribed dose distribution.
