  The field of particle therapy is quickly growing and yet it's more widespread
adoption is limited by size, cost and adaptation to the more conformal
treatment techniques. In order to realize the benefits of this modality the
equipment used to generate and deliver the beam is evolving. The accelerator is
one of the key components and its future is dictated by the ability to
accommodate the clinical requirements. This lecture is intended to provide an
introduction to these requirements and identify how synchrotrons are designed
to deliver the desired beams as well as what limitations exist and expectations
for the future of synchrotrons.
