  We present a topology for linear accelerators (linacs) that permits larger
degrees of freedom for the optimization of individual cavity shapes. The power
is distributed to the cavities through a waveguide with periodic apertures that
guarantees the correct phases and amplitudes along the structure. This topology
optimizes the power consumption and efficiency and allows the manipulation of
the surface fields for high gradient operation. It also provides a possibility
for low-temperature manufacturing techniques for use with novel materials. This
greatly enhanced performance for both normal and superconducting linacs. We
present a design and an experimental demonstration of this linac.
